published_papers "タイトル(日本語)","タイトル(英語)","著者(日本語)","著者(英語)","担当区分","概要(日本語)","概要(英語)","出版者・発行元(日本語)","出版者・発行元(英語)","出版年月","誌名(日本語)","誌名(英語)","巻","号","開始ページ","終了ページ","記述言語","査読の有無","招待の有無","掲載種別","国際・国内誌","国際共著","DOI","ISSN","eISSN","URL","URL2","主要な業績かどうか","公開の有無" "Active Thermography Inspection of Surface-whitened Mortars Measurement of Surface Spectral Absorptivity for Investigation of Efficient Heating Light Wavelengths","Active Thermography Inspection of Surface-whitened Mortars Measurement of Surface Spectral Absorptivity for Investigation of Efficient Heating Light Wavelengths","Masashi Ishikawa, Akira Emoto, Yoshihiro Suto, Hideo Nishino","Masashi Ishikawa, Akira Emoto, Yoshihiro Suto, Hideo Nishino","null","null","null","null","null","2023-12-08","Journal of Nondestructive Evaluation","Journal of Nondestructive Evaluation","Vol.43","No.1","7","7","eng","true","null","scientific_journal","null","null","10.1007/s10921-023-01026-9","1573-4862","null","null","null","null","null" "Observation of natural flexural pulse waves in retinal and carotid arteries for wall elasticity estimation","Observation of natural flexural pulse waves in retinal and carotid arteries for wall elasticity estimation","Laloy-Borgana Gabrielle, Puyo Leo, Hideo Nishino, Atlan Michael, Catheline Stefan","Laloy-Borgana Gabrielle, Puyo Leo, Hideo Nishino, Atlan Michael, Catheline Stefan","null","The risk of cardiovascular events is linked to arterial elasticity that can be estimated from the pulse wave velocity. This symmetric wave velocity is related to the wall elasticity through the Moens-Korteweg equation. However, ultrasound imaging techniques need improved accuracy, and optical measurements on retinal arteries produce inconsistent results. Here, we report the first observation of an antisymmetric pulse wave: the flexural pulse wave. An optical system performs in vivo wave velocity measurements on retinal arteries and veins. Velocity estimation ranges between 1 and 10 millimeter per second. The theory of guided waves confirms the existence of this wave mode and its low velocity. Natural flexural waves can also be detected at the bigger scale of a carotid artery using ultrafast ultrasound imaging. This second natural pulse wave has great potential of becoming a biomarker of blood vessel aging.","The risk of cardiovascular events is linked to arterial elasticity that can be estimated from the pulse wave velocity. This symmetric wave velocity is related to the wall elasticity through the Moens-Korteweg equation. However, ultrasound imaging techniques need improved accuracy, and optical measurements on retinal arteries produce inconsistent results. Here, we report the first observation of an antisymmetric pulse wave: the flexural pulse wave. An optical system performs in vivo wave velocity measurements on retinal arteries and veins. Velocity estimation ranges between 1 and 10 millimeter per second. The theory of guided waves confirms the existence of this wave mode and its low velocity. Natural flexural waves can also be detected at the bigger scale of a carotid artery using ultrafast ultrasound imaging. This second natural pulse wave has great potential of becoming a biomarker of blood vessel aging.","null","null","2023-06-21","Science Advances","Science Advances","Vol.9","No.25","eadf1783","eadf1783","eng","true","null","scientific_journal","null","null","10.1126/sciadv.adf1783","2375-2548","null","null","null","null","null" "Active thermography inspection of CFRP using cyclic heating and Fourier transform - comparison with flash heating method","Active thermography inspection of CFRP using cyclic heating and Fourier transform - comparison with flash heating method","Masashi Ishikawa, Takuto Miura, Hideo Nishino, Takeo Kato, Tetsuya Otsuki","Masashi Ishikawa, Takuto Miura, Hideo Nishino, Takeo Kato, Tetsuya Otsuki","null","null","null","null","null","2022-11-05","Advanced Composite Materials","Advanced Composite Materials","Vol.32","No.5","702","714","eng","true","null","scientific_journal","null","null","10.1080/09243046.2022.2141294","0924-3046","null","null","null","null","null" "超音波法による全固体電気化学デバイス用固体イオニクス材料の弾性率評価","超音波法による全固体電気化学デバイス用固体イオニクス材料の弾性率評価","井口 史匡, 日當 圭佑, 御手洗 祐作, 董 一穎, 宮崎 孝道, 芝田 司, 紺頼 大翔, 西野 秀郎, 大石 昌嗣","井口 史匡, 日當 圭佑, Yusaku Mitarai, 董 一穎, 宮崎 孝道, 芝田 司, 紺頼 大翔, Hideo Nishino, Masatsugu Oishi","null","null","null","null","null","2022-09-04","日本機械学会論文集","Transactions of the JSME","Vol.88","No.914","null","null","jpn","true","null","scientific_journal","null","null","10.1299/transjsme.22-00058","2187-9761","null","null","null","null","null" "Active thermography inspection of residual water in steel pipes: Detection and water height estimation","Active thermography inspection of residual water in steel pipes: Detection and water height estimation","Masashi Ishikawa, Yuya Kawai, Hayato Ishigaki, Kenzo Ogawa, Hideo Nishino","Masashi Ishikawa, Yuya Kawai, Hayato Ishigaki, Kenzo Ogawa, Hideo Nishino","null","null","null","null","null","2021-11-20","Nuclear Engineering and Design","Nuclear Engineering and Design","Vol.386","null","111566","111566","eng","true","null","scientific_journal","null","null","10.1016/j.nucengdes.2021.111566","0029-5493","null","null","null","null","null" "Influence of composition and surface discoloration of concrete on active thermographic nondestructive inspection","Influence of composition and surface discoloration of concrete on active thermographic nondestructive inspection","Masashi Ishikawa, Masayuki Tsukagoshi, Hideyuki Kasano, Hideo Nishino","Masashi Ishikawa, Masayuki Tsukagoshi, Hideyuki Kasano, Hideo Nishino","null","null","null","null","null","2020-08","Measurement","Measurement","Vol.168","null","108395","108395","eng","true","null","scientific_journal","null","null","10.1016/j.measurement.2020.108395","0263-2241","null","null","null","null","null" "Air-coupled ultrasonic vertical reflection method using pulse compression and various window functions: feasibility study","Air-coupled ultrasonic vertical reflection method using pulse compression and various window functions: feasibility study","Suzuki Kento, Mitsuya Endo, Masashi Ishikawa, Hideo Nishino","Suzuki Kento, Mitsuya Endo, Masashi Ishikawa, Hideo Nishino","null","null","null","null","null","2019-06-13","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.58","No.SG","SGGB09","SGGB09","eng","true","null","scientific_journal","null","null","10.7567/1347-4065/ab12cc","1347-4065","null","null","null","null","null" "A mathematical model of the Lamb wave reflection at a two-dimensional rectangular notch","A mathematical model of the Lamb wave reflection at a two-dimensional rectangular notch","junya Ishihara, Masashi Ishikawa, Hideo Nishino","junya Ishihara, Masashi Ishikawa, Hideo Nishino","null","null","null","null","null","2019-06-10","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.58","No.SG","SGGB08","SGGB08","eng","true","null","scientific_journal","null","null","10.7567/1347-4065/ab0ad8","1347-4065","null","null","null","null","null" "Active thermographic inspection of carbon fiber reinforced plastic laminates using laser scanning heating","Active thermographic inspection of carbon fiber reinforced plastic laminates using laser scanning heating","Masashi Ishikawa, Masaki Ando, Masashi Koyama, Hideo Nishino","Masashi Ishikawa, Masaki Ando, Masashi Koyama, Hideo Nishino","null","null","null","null","null","2019-02-01","Composite Structures","Composite Structures","Vol.209","null","515","522","eng","true","null","scientific_journal","null","null","10.1016/j.compstruct.2018.10.113","0263-8223","null","null","null","null","null" "Attenuation characteristics of the leaky T(0,1) mode guided wave propagating in piping coated with anticorrosion grease","Attenuation characteristics of the leaky T(0,1) mode guided wave propagating in piping coated with anticorrosion grease","Hideo Nishino, Tateishi Kohei, Masashi Ishikawa, Takashi Furukawa, Motoki Goka","Hideo Nishino, Tateishi Kohei, Masashi Ishikawa, Takashi Furukawa, Motoki Goka","null","null","null","null","null","2018-05","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.57","No.7S1","07LC02","07LC02","eng","true","null","scientific_journal","null","null","10.7567/JJAP.57.07LC02","1347-4065","null","null","null","null","null" "Mode conversion behavior of guided wave in a pipe inspection system based on a long waveguide","Mode conversion behavior of guided wave in a pipe inspection system based on a long waveguide","Feian Sun, Zhenguo Sun, Qiang Chen, Riichi Murayama, Hideo Nishino","Feian Sun, Zhenguo Sun, Qiang Chen, Riichi Murayama, Hideo Nishino","null","To make clear the mode conversion behavior of S0-mode lamb wave and SH0-plate wave converting to the longitudinal mode guided wave and torsional mode guided wave in a pipe, respectively, the experiments were performed based on a previous built pipe inspection system. The pipe was wound with an L-shaped plate or a T-shaped plate as the waveguide, and the S0-wave and SH0-wave were excited separately in the waveguide. To carry out the objective, a meander-line coil electromagnetic acoustic transducer (EMAT) for S0-wave and a periodic permanent magnet (PPM) EMAT for SH0-wave were developed and optimized. Then, several comparison experiments were conducted to compare the efficiency of mode conversion. Experimental results showed that the T(0,1) mode, L(0,1) mode, and L(0,2) mode guided waves can be successfully detected when converted from the S0-wave or SH0-wave with different shaped waveguides. It can also be inferred that the S0-wave has a better ability to convert to the T(0,1) mode, while the SH0-wave is easier to convert to the L(0,1) mode and L(0,2) mode, and the L-shaped waveguide has a better efficiency than T-shaped waveguide.","To make clear the mode conversion behavior of S0-mode lamb wave and SH0-plate wave converting to the longitudinal mode guided wave and torsional mode guided wave in a pipe, respectively, the experiments were performed based on a previous built pipe inspection system. The pipe was wound with an L-shaped plate or a T-shaped plate as the waveguide, and the S0-wave and SH0-wave were excited separately in the waveguide. To carry out the objective, a meander-line coil electromagnetic acoustic transducer (EMAT) for S0-wave and a periodic permanent magnet (PPM) EMAT for SH0-wave were developed and optimized. Then, several comparison experiments were conducted to compare the efficiency of mode conversion. Experimental results showed that the T(0,1) mode, L(0,1) mode, and L(0,2) mode guided waves can be successfully detected when converted from the S0-wave or SH0-wave with different shaped waveguides. It can also be inferred that the S0-wave has a better ability to convert to the T(0,1) mode, while the SH0-wave is easier to convert to the L(0,1) mode and L(0,2) mode, and the L-shaped waveguide has a better efficiency than T-shaped waveguide.","null","null","2016-10-19","Sensors","Sensors","Vol.16","No.10","1737","1737","eng","true","null","scientific_journal","null","null","10.3390/s16101737","1424-8220","null","null","null","null","null" "Wall thickness measurement using resonant phenomena of circumferential Lamb waves generated by plural transducer elements located evenly on girth","Wall thickness measurement using resonant phenomena of circumferential Lamb waves generated by plural transducer elements located evenly on girth","Hideo Nishino, Kodai Iwata, Masashi Ishikawa","Hideo Nishino, Kodai Iwata, Masashi Ishikawa","null","null","null","null","null","2016-06","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.55","null","7S1","7S1","eng","true","null","scientific_journal","null","null","10.7567/JJAP.55.07KC07","0021-4922","null","null","null","null","null" "Frequency dependence of the defect sensitivity of guided wave testing for efficient defect detection at pipe elbows","Frequency dependence of the defect sensitivity of guided wave testing for efficient defect detection at pipe elbows","Toshihiro Yamamoto, Takashi Furukawa, Hideo Nishino","Toshihiro Yamamoto, Takashi Furukawa, Hideo Nishino","null","null","null","null","null","2016-03","Materials Transactions","Materials Transactions","Vol.57","No.3","397","403","eng","true","null","scientific_journal","null","null","10.2320/matertrans.M2015319","1347-5320","null","null","null","null","null" "Resonant phenomena of circumferential SH waves converted from T(0,1) mode guided waves at non-axisymmetric defects","Resonant phenomena of circumferential SH waves converted from T(0,1) mode guided waves at non-axisymmetric defects","Hideo Nishino, Saygo Ishii, Takashi Furukawa","Hideo Nishino, Saygo Ishii, Takashi Furukawa","null","null","null","null","null","2015-05","41th annual review of progress in quantitative nondestructive evaluation","41th annual review of progress in quantitative nondestructive evaluation","Vol.34","null","221","226","eng","true","null","scientific_journal","null","null","10.1063/1.4914613","0094-243X","null","null","null","null","null" "An Investigation of reflection coefficients of the T(0,1) mode guided waves at axisymmetric defects and Inverse problem analyses for estimations of defect shapes","An Investigation of reflection coefficients of the T(0,1) mode guided waves at axisymmetric defects and Inverse problem analyses for estimations of defect shapes","Hideo Nishino","Hideo Nishino","null","The frequency dependences of the reflection coefficients at gradual step-down axisymmetric defects were experimentally evaluated for the investigation of the reflection phenomena of the T(0,1) mode guided waves. Different frequency dependences were observed depending on the axial profile of the defect. A mathematical model using the characteristic acoustic impedance for calculating the reflection coefficients at axisymmetric defects was introduced. The reflection coefficients for the gradual step-down axisymmetric defects were confirmed to be in good agreement with the calculation results. By utilizing the mathematical model, a reflection mechanism was explained precisely and was verified. An inverse problem analysis for estimating the shape of an axisymmetric defect was also proposed based on the experimental reflection coefficients as a function of frequency together with the calculation model. Experimental verification of the proposed estimation method was performed using circular concave axisymmetric defects inside pipe specimens. The estimation results and accuracy were discussed in terms of the relation between the frequency range and the axial length of the defects.","The frequency dependences of the reflection coefficients at gradual step-down axisymmetric defects were experimentally evaluated for the investigation of the reflection phenomena of the T(0,1) mode guided waves. Different frequency dependences were observed depending on the axial profile of the defect. A mathematical model using the characteristic acoustic impedance for calculating the reflection coefficients at axisymmetric defects was introduced. The reflection coefficients for the gradual step-down axisymmetric defects were confirmed to be in good agreement with the calculation results. By utilizing the mathematical model, a reflection mechanism was explained precisely and was verified. An inverse problem analysis for estimating the shape of an axisymmetric defect was also proposed based on the experimental reflection coefficients as a function of frequency together with the calculation model. Experimental verification of the proposed estimation method was performed using circular concave axisymmetric defects inside pipe specimens. The estimation results and accuracy were discussed in terms of the relation between the frequency range and the axial length of the defects.","null","null","2015-01","Materials Transactions","Materials Transactions","Vol.56","No.1","120","128","eng","true","null","scientific_journal","null","null","10.2320/matertrans.M2014331","1345-9678","null","http://ci.nii.ac.jp/naid/130004704653/","null","null","null" "Efficient defect Detection of Elbow Pipes Using Propagation Characteristics of Guided Waves","Efficient defect Detection of Elbow Pipes Using Propagation Characteristics of Guided Waves","Toshihiro Yamamoto, Takashi Furukawa, Hideo Nishino","Toshihiro Yamamoto, Takashi Furukawa, Hideo Nishino","null","null","null","null","null","2014-05","40th annual review of progress in quantitative nondestructive evaluation","40th annual review of progress in quantitative nondestructive evaluation","Vol.33A","null","373","379","eng","true","null","scientific_journal","null","null","10.1063/1.4864844","null","null","null","null","null","null" "Resonant Phenomena of Circumferential Lamb waves by eight Transducer Elements located evenly on Girth and Wall Thickness Measurements","Resonant Phenomena of Circumferential Lamb waves by eight Transducer Elements located evenly on Girth and Wall Thickness Measurements","Hideo Nishino, Keiichi Morita","Hideo Nishino, Keiichi Morita","null","null","null","null","null","2014-05","40th annual review of progress in quantitative nondestructive evaluation","40th annual review of progress in quantitative nondestructive evaluation","Vol.33A","null","264","270","eng","true","null","scientific_journal","null","null","10.1063/1.4864829","null","null","null","null","null","null" "Simultaneous measurement of the phase and group velocities of Lamb waves in a laser-generation based imaging method","Simultaneous measurement of the phase and group velocities of Lamb waves in a laser-generation based imaging method","Hideo Nishino, Toshiro Tanaka, Kenichi Yoshida, Junji Takatsubo","Hideo Nishino, Toshiro Tanaka, Kenichi Yoshida, Junji Takatsubo","null","This paper describes a novel approach to the simultaneous measurement of the phase and group velocities of Lamb waves based on images of their propagation. The laser-generation based imaging method was first introduced to obtain images of Lamb wave propagation. The time series of snapshot images is used to make a position-time diagram, and the velocities can be estimated based on the slopes of the position curves. Thus, the phase and group velocities can be obtained by measuring the phase advance and energy flow of the Lamb wave, respectively. Details of the principle of simultaneous measurement are presented herein. Experimental verification was also performed in the range of 0.2-3.0 MHz-mm using aluminum plates. The average errors between experiment and theory in the phase and group velocities were 3.31% and 5.68%, respectively.","This paper describes a novel approach to the simultaneous measurement of the phase and group velocities of Lamb waves based on images of their propagation. The laser-generation based imaging method was first introduced to obtain images of Lamb wave propagation. The time series of snapshot images is used to make a position-time diagram, and the velocities can be estimated based on the slopes of the position curves. Thus, the phase and group velocities can be obtained by measuring the phase advance and energy flow of the Lamb wave, respectively. Details of the principle of simultaneous measurement are presented herein. Experimental verification was also performed in the range of 0.2-3.0 MHz-mm using aluminum plates. The average errors between experiment and theory in the phase and group velocities were 3.31% and 5.68%, respectively.","null","null","2012-02-09","Ultrasonics","Ultrasonics","Vol.52","No.4","530","535","eng","true","null","scientific_journal","null","null","10.1016/j.ultras.2011.11.005","1874-9968","null","null","null","null","null" "Precise measurement of pipe wall thickness in noncontact manner by a circumferential Lamb wave generated and detected by a pair of air-coupled transducers","Precise measurement of pipe wall thickness in noncontact manner by a circumferential Lamb wave generated and detected by a pair of air-coupled transducers","Hideo Nishino, Tadashi Asano, Yuta Taniguchi, Kenichi Yoshida, Hitoshi Ogawa, Masakazu Takahashi, Yukio Ogura","Hideo Nishino, Tadashi Asano, Yuta Taniguchi, Kenichi Yoshida, Hitoshi Ogawa, Masakazu Takahashi, Yukio Ogura","null","In this paper, we present a novel method of accurately estimating pipe wall thickness by detecting the minute difference in the angular wave number of a circumferential (C-) Lamb wave. A C-Lamb wave circling along a circumference of a pipe is transmitted and received by a pair of noncontact air-coupled ultrasonic transducers. For the accurate detection of the angular wave number, a large number of tone-burst cycles are used so as to superpose the C-Lamb wave on itself along its circumferential orbit. In this setting, the amplitude of the superposed region changes considerably with the angular wave number, from which the wall thickness can be estimated. This method is very useful to monitor the integrity of piping in high-temperature environments because of its noncontact nature. The principle of the method and experimental verification are shown.","In this paper, we present a novel method of accurately estimating pipe wall thickness by detecting the minute difference in the angular wave number of a circumferential (C-) Lamb wave. A C-Lamb wave circling along a circumference of a pipe is transmitted and received by a pair of noncontact air-coupled ultrasonic transducers. For the accurate detection of the angular wave number, a large number of tone-burst cycles are used so as to superpose the C-Lamb wave on itself along its circumferential orbit. In this setting, the amplitude of the superposed region changes considerably with the angular wave number, from which the wall thickness can be estimated. This method is very useful to monitor the integrity of piping in high-temperature environments because of its noncontact nature. The principle of the method and experimental verification are shown.","null","null","2011-07-25","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.50","No.7","07HC10","07HC10-7","eng","true","null","scientific_journal","null","null","10.1143/JJAP.50.07HC10","0021-4922","null","http://ci.nii.ac.jp/naid/150000057613/","null","null","null" "An experimental investigation of mode conversions of the T(0,1) mode guided wave propagating in an elbow pipe","An experimental investigation of mode conversions of the T(0,1) mode guided wave propagating in an elbow pipe","Hideo Nishino, Toshiro Tanaka, Saori Katashima, Kenichi Yoshida","Hideo Nishino, Toshiro Tanaka, Saori Katashima, Kenichi Yoshida","null","Mode conversions from the fundamental torsional guided wave mode, $athrm{T}(0,1)$, to the higher-order torsional modes, $athrm{T}(1,1)$, $athrm{T}(2,1)$, $athrm{T}(3,1)$, and $athrm{T}(4,1)$, at a welded elbow pipe were experimentally investigated in a wide frequency range from 30 to 80 kHz. One ring-shaped transducer system was used as the transmitter and another as the receiver. Both systems consist of eight circumferentially located piezoelectric transducer elements. A novel method for a preferential detection of the torsional modes was proposed on the basis of the circumferential wave structures of the modes, which was utilized for investigations of mode conversions. Dispersion relations of the converted modes in frequency ranges from 30 to 80 kHz were also experimentally investigated, which agreed very well with those of the theoretical calculations.","Mode conversions from the fundamental torsional guided wave mode, $athrm{T}(0,1)$, to the higher-order torsional modes, $athrm{T}(1,1)$, $athrm{T}(2,1)$, $athrm{T}(3,1)$, and $athrm{T}(4,1)$, at a welded elbow pipe were experimentally investigated in a wide frequency range from 30 to 80 kHz. One ring-shaped transducer system was used as the transmitter and another as the receiver. Both systems consist of eight circumferentially located piezoelectric transducer elements. A novel method for a preferential detection of the torsional modes was proposed on the basis of the circumferential wave structures of the modes, which was utilized for investigations of mode conversions. Dispersion relations of the converted modes in frequency ranges from 30 to 80 kHz were also experimentally investigated, which agreed very well with those of the theoretical calculations.","null","null","2011-04-25","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.50","No.4","46601","046601-7","eng","true","null","scientific_journal","null","null","10.1143/JJAP.50.046601","0021-4922","null","http://ci.nii.ac.jp/naid/150000055500/","null","null","null" "Dynamic Behavior Evaluation of Martensitic Transformation in Cu-Al-Ni Shape Memory Alloy Using Acoustic Emission Simulation by FEM","Dynamic Behavior Evaluation of Martensitic Transformation in Cu-Al-Ni Shape Memory Alloy Using Acoustic Emission Simulation by FEM","Takeshi Yasuda, Baojun Pang, Hideo Nishino, Kenichi Yoshida","Takeshi Yasuda, Baojun Pang, Hideo Nishino, Kenichi Yoshida","null","null","null","null","null","2011-02-09","Materials Transactions","Materials Transactions","Vol.52","No.3","397","405","eng","true","null","scientific_journal","null","null","10.2320/matertrans.M2010360","1345-9678","null","http://ci.nii.ac.jp/naid/10027838408/","null","null","null" "Efficient transduction of circumferential Lamb wave by a pair of line focus type noncontact air-coupled ultrasonic transducers and its application for accurate measurement of pipe wall thickness","Efficient transduction of circumferential Lamb wave by a pair of line focus type noncontact air-coupled ultrasonic transducers and its application for accurate measurement of pipe wall thickness","Hideo Nishino, Kenichi Yoshida, Tadashi Asano, Yuta Taniguchi, Masakazu Takahashi, Yukio Ogura","Hideo Nishino, Kenichi Yoshida, Tadashi Asano, Yuta Taniguchi, Masakazu Takahashi, Yukio Ogura","null","null","null","null","null","2011-02","Electric Journal of Advanced Maintenance","Electric Journal of Advanced Maintenance","Vol.2","No.4","181","190","eng","true","true","scientific_journal","null","null","null","1883-9894","null","null","null","null","null" "Long range testing of a welded elbow pipe using the T(0,1) mode ultrasonic guided wave","Long range testing of a welded elbow pipe using the T(0,1) mode ultrasonic guided wave","Hideo Nishino, Shuichi Masuda, Yuki Mizobuchi, Tadashi Asano, Kenichi Yoshida","Hideo Nishino, Shuichi Masuda, Yuki Mizobuchi, Tadashi Asano, Kenichi Yoshida","null","An experimental investigation of sensitivity in defect detection in welded elbow pipes using the $athrm{T}(0, 1)$ mode guided wave was carried out. A piezoelectric ring-shaped sensor system was cramped on one of the two straight parts in the straight-elbow-straight setting. An artificial defect was introduced into the other straight part. To evaluate the sensitivities, the depth of the artificial defect was gradually increased to 2.0 mm by 0.05 mm increments. The following are the obtained experimental results. (1) Spurious signals due to the two welds, which could be markedly changed by varying the welding conditions were found. (2) These spurious signals interfered with and masked the defect signal, but changes in signal amplitude owing to the incremental defect could be sufficiently detected. (3) Sensitivities of defect detection in welded elbow pipes were approximately 1/4 1/5 that in a straight pipe. At the end of the paper, the characteristics of the observed waveform in the welded elbow pipes are discussed for use in the guided wave inspection.","An experimental investigation of sensitivity in defect detection in welded elbow pipes using the $athrm{T}(0, 1)$ mode guided wave was carried out. A piezoelectric ring-shaped sensor system was cramped on one of the two straight parts in the straight-elbow-straight setting. An artificial defect was introduced into the other straight part. To evaluate the sensitivities, the depth of the artificial defect was gradually increased to 2.0 mm by 0.05 mm increments. The following are the obtained experimental results. (1) Spurious signals due to the two welds, which could be markedly changed by varying the welding conditions were found. (2) These spurious signals interfered with and masked the defect signal, but changes in signal amplitude owing to the incremental defect could be sufficiently detected. (3) Sensitivities of defect detection in welded elbow pipes were approximately 1/4 1/5 that in a straight pipe. At the end of the paper, the characteristics of the observed waveform in the welded elbow pipes are discussed for use in the guided wave inspection.","null","null","2010-11-25","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.49","No.11","116602-1","116602-6","eng","true","null","scientific_journal","null","null","10.1143/JJAP.49.116602","0021-4922","null","http://ci.nii.ac.jp/naid/150000053333/","null","null","null" "Highly Sensitive Detection of Defects in Piping Using Multireflecting Guided Wave Energy Trapping Method","Highly Sensitive Detection of Defects in Piping Using Multireflecting Guided Wave Energy Trapping Method","Hideo Nishino, Ogura Keiji, Tanaka Toshiro, Kenichi Yoshida","Hideo Nishino, Ogura Keiji, Tanaka Toshiro, Kenichi Yoshida","null","A multireflecting guided wave energy trapping (MGET) method has been developed for the highly sensitive detection of defects in a pipe using a guided wave. The MGET method enhances the amplitude of a defect signal using two wave reflectors. In the MGET method, the two reflectors are set at both ends of a region of piping to be inspected, and a guided wave is generated, which propagates in the region of inspection. With this setup, multireflection can be observed between the two reflectors. If a defect exists in the region, the amplitude of the defect signal increases owing to the increase in the number of reflections at the reflectors because $n$ combinations of multiple propagation paths having the same path length exist in the defect signal after $n$ reflections. Details of the principle of the MGET method and its experimental verification are reported. The sensitivity of the MGET method is about 10 times higher than that of the conventional guided wave method. The efficiency of the method is quantitatively discussed by considering a simple mathematical model together with the experimental results.","A multireflecting guided wave energy trapping (MGET) method has been developed for the highly sensitive detection of defects in a pipe using a guided wave. The MGET method enhances the amplitude of a defect signal using two wave reflectors. In the MGET method, the two reflectors are set at both ends of a region of piping to be inspected, and a guided wave is generated, which propagates in the region of inspection. With this setup, multireflection can be observed between the two reflectors. If a defect exists in the region, the amplitude of the defect signal increases owing to the increase in the number of reflections at the reflectors because $n$ combinations of multiple propagation paths having the same path length exist in the defect signal after $n$ reflections. Details of the principle of the MGET method and its experimental verification are reported. The sensitivity of the MGET method is about 10 times higher than that of the conventional guided wave method. The efficiency of the method is quantitatively discussed by considering a simple mathematical model together with the experimental results.","null","null","2010-06-25","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.49","No.6","066602-1","066602-7","eng","true","null","scientific_journal","null","null","10.1143/JJAP.49.066602","0021-4922","null","http://ci.nii.ac.jp/naid/150000054279/","null","null","null" "Defect detection of a pipe using a guided wave generated by an efficient transduction with a reflector","Defect detection of a pipe using a guided wave generated by an efficient transduction with a reflector","Hideo Nishino, Ogura Keiji, Komatsu Toyokazu, Kenichi Yoshida","Hideo Nishino, Ogura Keiji, Komatsu Toyokazu, Kenichi Yoshida","null","Experimental investigations of sensitivities for defect detection in pipes by guided waves were described. An efficient method of transduction with a reflector was used and its sensitivity was evaluated in comparison to that of conventional transduction without a reflector. An efficient transduction could be realized by placing the reflector at an appropriate axial position, which was briefly described in the paper. The experiments were carried out using a 60.5-mm-outer-diameter and 4-mm-thick aluminum pipe and a piezoelectric ring-shaped sensor system. It was confirmed that the sensitivity in the case with the reflector was more than twofold that in the case without the reflector. The detection limits and sensitivities in a noisy environment were compared between the transductions with and without the reflector.","Experimental investigations of sensitivities for defect detection in pipes by guided waves were described. An efficient method of transduction with a reflector was used and its sensitivity was evaluated in comparison to that of conventional transduction without a reflector. An efficient transduction could be realized by placing the reflector at an appropriate axial position, which was briefly described in the paper. The experiments were carried out using a 60.5-mm-outer-diameter and 4-mm-thick aluminum pipe and a piezoelectric ring-shaped sensor system. It was confirmed that the sensitivity in the case with the reflector was more than twofold that in the case without the reflector. The detection limits and sensitivities in a noisy environment were compared between the transductions with and without the reflector.","null","null","2009-09-25","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.48","No.9","094501-1","094501-7","eng","true","null","scientific_journal","null","null","10.1143/JJAP.48.094501","0021-4922","null","http://ci.nii.ac.jp/naid/150000053024/","null","null","null" "Efficient Generation and Detection of a Guided Wave in a Pipe using Guided Wave Reflectors","Efficient Generation and Detection of a Guided Wave in a Pipe using Guided Wave Reflectors","Hideo Nishino, Tanaka Yasuhiro, Kato Yasuhisa, Kenichi Yoshida","Hideo Nishino, Tanaka Yasuhiro, Kato Yasuhisa, Kenichi Yoshida","null","A simple and effective method for generation and detection of a guided wave in a pipe was proposed using an iron hose-fixing belt as a reflector of the guided wave. The reflector is located (2n+1)λ/4 (n=1,2,3,,,) apart from a guided wave sensor in axial direction for the effective generation or detection in the magneto-strictive transduction. The reflector setting is determined under the consideration to the distance between the sensor and the reflector as well as phase inversion at the reflector. In above reflector setting, large amplitude is obtained because multiple-reflection between the reflector and the sensor occurs under phase matching conditions. In this paper, the principle of the method was first described. Experiments were carried out with the non-dispersive T(0,1) mode to verify the principle in comparison to a simple theory.","A simple and effective method for generation and detection of a guided wave in a pipe was proposed using an iron hose-fixing belt as a reflector of the guided wave. The reflector is located (2n+1)λ/4 (n=1,2,3,,,) apart from a guided wave sensor in axial direction for the effective generation or detection in the magneto-strictive transduction. The reflector setting is determined under the consideration to the distance between the sensor and the reflector as well as phase inversion at the reflector. In above reflector setting, large amplitude is obtained because multiple-reflection between the reflector and the sensor occurs under phase matching conditions. In this paper, the principle of the method was first described. Experiments were carried out with the non-dispersive T(0,1) mode to verify the principle in comparison to a simple theory.","null","null","2009-03","Journal of Solid Mechanics and Materials Engineering","Journal of Solid Mechanics and Materials Engineering","Vol.3","No.2","267","277","eng","true","null","scientific_journal","null","null","10.1299/jmmp.3.267","1880-9871","null","http://ci.nii.ac.jp/naid/130000667660/","null","null","null" "EXPERIMENTAL SIMULATION AND DYNAMIC BEHAVIOR OF THE AE DUE TO MARTENSITIC TRANSFORMATION USING SHEAR WAVE TRANSMISSION SENSOR","EXPERIMENTAL SIMULATION AND DYNAMIC BEHAVIOR OF THE AE DUE TO MARTENSITIC TRANSFORMATION USING SHEAR WAVE TRANSMISSION SENSOR","Kenichi Yoshida, Takeshi Yasuda, Shinya Kondo, Hideo Nishino","Kenichi Yoshida, Takeshi Yasuda, Shinya Kondo, Hideo Nishino","null","We conducted the waveform analysis of acoustic emission (AE) signals to study the dynamic behavior of materials deformed or transformed; namely, two types of martensitic transformation in Cu-Ni-Al shape-memory-alloy (SMA) single crystals during tensile deformation that produce different martensitic structures. The AE source behavior is expected to be of shear. We simulated AE signals due to martensitic transformation using a shear-wave transducer as the artificial source. Results of AE waveform analysis in Cu-Al-Ni SMA single crystals are compared with the simulation results. The martensite with a simpler stacking structure exhibits faster transformation behavior.","We conducted the waveform analysis of acoustic emission (AE) signals to study the dynamic behavior of materials deformed or transformed; namely, two types of martensitic transformation in Cu-Ni-Al shape-memory-alloy (SMA) single crystals during tensile deformation that produce different martensitic structures. The AE source behavior is expected to be of shear. We simulated AE signals due to martensitic transformation using a shear-wave transducer as the artificial source. Results of AE waveform analysis in Cu-Al-Ni SMA single crystals are compared with the simulation results. The martensite with a simpler stacking structure exhibits faster transformation behavior.","null","null","2008-12-01","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.26","null","270","278","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "Theoretical and Experimental investigations of transmission coefficients of longitudinal waves through metal plates immersed in air for uses of air coupled ultrasounds","Theoretical and Experimental investigations of transmission coefficients of longitudinal waves through metal plates immersed in air for uses of air coupled ultrasounds","Hideo Nishino, Masuda Shuichi, Kenichi Yoshida, Takahashi Masakazu, Hoshino Hidekazu, Ogura Yukio, Kitagawa Hideaki, Kusumoto Junichi, Kanaya Akihiro","Hideo Nishino, Masuda Shuichi, Kenichi Yoshida, Takahashi Masakazu, Hoshino Hidekazu, Ogura Yukio, Kitagawa Hideaki, Kusumoto Junichi, Kanaya Akihiro","null","null","null","null","null","2008-12-01","Materials Transactions","Materials Transactions","Vol.49","No.12","2861","2867","eng","true","null","scientific_journal","null","null","10.2320/matertrans.MRA2008270","1345-9678","null","http://ci.nii.ac.jp/naid/10024404164/","null","null","null" "Tone-burst generation of circumferential guided waves by a bulk shear wave sensor and their wide-range time-frequency analyses","Tone-burst generation of circumferential guided waves by a bulk shear wave sensor and their wide-range time-frequency analyses","Hideo Nishino, Ryuichi Yokoyama, Keiji Ogura, Hironori Kondo, Kenichi Yoshida","Hideo Nishino, Ryuichi Yokoyama, Keiji Ogura, Hironori Kondo, Kenichi Yoshida","null","Wide range generation of the circumferential guided waves (C-GWs) propagating along the perimeter of a pipe has been carried out using a single shear wave sensor along with several tone-burst sources. The C-GWs are classified mainly into two propagation modes, circumferential shear horizontal (C-SH) and circumferential Lamb (C-Lamb) waves. The authors previously reported that a simple and selective generation of the two modes using a single shear wave sensor could be realized by changing the polarization direction of the sensor. When the polarization direction of the sensor is parallel or vertical to the axial direction of a pipe, either the C-SH or the C-Lamb wave is selectively generated. In this paper, a newly exploited signal processing method to obtain a wide-range time frequency analysis for the C-GW is proposed using wavelet transformation along with various tone-burst signals swept in the required frequency range. Time frequency analyses of the results for the C-SH and C-Lamb waves propagating along 30-mm outer diameter and 1-mm-thick aluminum pipe are shown in comparison with the theoretical dispersion relation of the propagation modes. Quantitative evaluations of this method are discussed based on the Reciprocity theorem and Fourier transformation.","Wide range generation of the circumferential guided waves (C-GWs) propagating along the perimeter of a pipe has been carried out using a single shear wave sensor along with several tone-burst sources. The C-GWs are classified mainly into two propagation modes, circumferential shear horizontal (C-SH) and circumferential Lamb (C-Lamb) waves. The authors previously reported that a simple and selective generation of the two modes using a single shear wave sensor could be realized by changing the polarization direction of the sensor. When the polarization direction of the sensor is parallel or vertical to the axial direction of a pipe, either the C-SH or the C-Lamb wave is selectively generated. In this paper, a newly exploited signal processing method to obtain a wide-range time frequency analysis for the C-GW is proposed using wavelet transformation along with various tone-burst signals swept in the required frequency range. Time frequency analyses of the results for the C-SH and C-Lamb waves propagating along 30-mm outer diameter and 1-mm-thick aluminum pipe are shown in comparison with the theoretical dispersion relation of the propagation modes. Quantitative evaluations of this method are discussed based on the Reciprocity theorem and Fourier transformation.","null","null","2008-05-25","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.47","No.5B","3885","3893","eng","true","null","scientific_journal","null","null","10.1143/JJAP.47.3885","0021-4922","null","http://ci.nii.ac.jp/naid/150000050591/","null","null","null" "Generation of circumferential guided waves using a bulk shear wave sensor and their mode identification","Generation of circumferential guided waves using a bulk shear wave sensor and their mode identification","Hideo Nishino, Yokoyama Ryuji, Kondo Hironori, Kenichi Yoshida","Hideo Nishino, Yokoyama Ryuji, Kondo Hironori, Kenichi Yoshida","null","A novel method of generating circumferential guided waves (C-GWs) propagating in a pipe has been proposed using a single bulk shear wave (BSW) sensor. The generated C-GWs are classified into circumferential shear horizontal (C-SH) waves and circumferential Lamb (C-Lamb) waves. The BSW sensor is dry-coupled on the outer surface of the pipe to generate the C-GWs. The selective generation of the C-SH wave or the C-Lamb wave was realized by changing the polarization direction of the BSW sensor relative to the axial direction of the pipe. The C-SH and C-Lamb waves were selectively generated using a 66-mm-outer-diameter and 0.1-mm-thick steel pipe, and a 30-mm-outer-diameter and a 1-mm-thick aluminum (Al) pipe, respectively. The obtained results were compared with both theoretical group velocities and particle displacements to identify the specific propagation mode. The group velocities of the generated C-GWs were in good agreement with the theoretical values. The generation efficiency of the C-GWs was also discussed on the basis of the theoretical particle displacements for their modes.","A novel method of generating circumferential guided waves (C-GWs) propagating in a pipe has been proposed using a single bulk shear wave (BSW) sensor. The generated C-GWs are classified into circumferential shear horizontal (C-SH) waves and circumferential Lamb (C-Lamb) waves. The BSW sensor is dry-coupled on the outer surface of the pipe to generate the C-GWs. The selective generation of the C-SH wave or the C-Lamb wave was realized by changing the polarization direction of the BSW sensor relative to the axial direction of the pipe. The C-SH and C-Lamb waves were selectively generated using a 66-mm-outer-diameter and 0.1-mm-thick steel pipe, and a 30-mm-outer-diameter and a 1-mm-thick aluminum (Al) pipe, respectively. The obtained results were compared with both theoretical group velocities and particle displacements to identify the specific propagation mode. The group velocities of the generated C-GWs were in good agreement with the theoretical values. The generation efficiency of the C-GWs was also discussed on the basis of the theoretical particle displacements for their modes.","null","null","2007-07-30","Japanese Journal of Applied Physics, Part 1 (Regular Papers & Short Notes)","Japanese Journal of Applied Physics, Part 1 (Regular Papers & Short Notes)","Vol.46","No.7B","4568","4576","eng","true","null","scientific_journal","null","null","10.1143/JJAP.46.4568","1347-4065","null","http://ci.nii.ac.jp/naid/150000049073/","null","null","null" "パイプを伝搬するGuided waveの速度分散関係を利用した肉厚外径比の推定法とレーザー超音波法を用いた検証","Novel method of estimating the thickness/diameter using the primary wave velocity of a guided wave in a pipe and its verification with wide-band laser ultrasound","西野 秀郎, 吉田 憲一, 長 秀雄, 竹本 幹男","Hideo Nishino, Kenichi Yoshida, 長 秀雄, 竹本 幹男","null","パイプの長手方向に伝搬するGuided wave(ガイド波)の速度分散関係を用いた肉厚外径比(thikness/diameter; t/d)の推定方法を示した.本方法は,ガイド波の速度分散関係がt/dに依存して変化することを利用する.具体的には,インパルス励起した高帯域ガイド彼のうち,第1波(primary wave; P波)の群音速が,t/dに依存して変化することを利用する.P波は,肉厚パイプ(t/dが大)ほど群速度が遅く,薄肉パイプ(t/dが小)ほど速い.本論文では,ガイド彼の理論と本方法の原理を示す.また,レーザ超音波法を用いた原理確認実験の結果は,理論的予想とよく一致したので報告する.","パイプの長手方向に伝搬するGuided wave(ガイド波)の速度分散関係を用いた肉厚外径比(thikness/diameter; t/d)の推定方法を示した.本方法は,ガイド波の速度分散関係がt/dに依存して変化することを利用する.具体的には,インパルス励起した高帯域ガイド彼のうち,第1波(primary wave; P波)の群音速が,t/dに依存して変化することを利用する.P波は,肉厚パイプ(t/dが大)ほど群速度が遅く,薄肉パイプ(t/dが小)ほど速い.本論文では,ガイド彼の理論と本方法の原理を示す.また,レーザ超音波法を用いた原理確認実験の結果は,理論的予想とよく一致したので報告する.","null","null","2007-01","日本音響学会誌","The Journal of the Acoustical Society of Japan","Vol.63","No.1","13","20","jpn","true","null","scientific_journal","null","null","null","0369-4232","null","http://ci.nii.ac.jp/naid/110006152731/","null","null","null" "Dynamic Behavior of Two Types of Martensitic Transformations in Cu-Al-Ni Shape Memory Alloy Single Crystal by Acoustic Emission Method","Dynamic Behavior of Two Types of Martensitic Transformations in Cu-Al-Ni Shape Memory Alloy Single Crystal by Acoustic Emission Method","Kenichi Yoshida, Takeshi Yasuda, Daiki Tani, Hideo Nishino","Kenichi Yoshida, Takeshi Yasuda, Daiki Tani, Hideo Nishino","null","null","null","null","null","2006-12-01","Advanced Materials Research","Advanced Materials Research","Vol.13-14","null","305","312","eng","true","null","scientific_journal","null","null","10.4028/www.scientific.net/AMR.13-14.305","1662-8985","null","null","null","null","null" "Propagation phenomena of wideband guided waves in a bended pipe","Propagation phenomena of wideband guided waves in a bended pipe","Hideo Nishino, Kenichi Yoshida, Cho Hideo, Takemoto Mikio","Hideo Nishino, Kenichi Yoshida, Cho Hideo, Takemoto Mikio","null","null","null","null","null","2006-12","Ultrasonics","Ultrasonics","Vol.44","null","e1139","e1143","eng","true","null","scientific_journal","null","null","10.1016/j.ultras.2006.05.155","0041-624X","null","null","null","null","null" "Boron Effects of AE Event Rate Peaks during Tensile Deformation of Ni3Al Intermetallic Compound","Boron Effects of AE Event Rate Peaks during Tensile Deformation of Ni3Al Intermetallic Compound","Kenichi Yoshida, Yuji Masui, Takuo Nagamachi, Hideo Nishino","Kenichi Yoshida, Yuji Masui, Takuo Nagamachi, Hideo Nishino","null","Tensile testing of Ni3Al intermetallic compound single crystals with no additive, 0.25 and 0.50at.% boron has been performed using acoustic emission(AE) method in order to examine the interaction between boron atoms and mobile dislocations. Boron additives increase the yield strength of Ni3Al by 276 MPa/at.%. AE event rates have two peaks at yield point and in work-hardening region. The peak event rates and the distance between these peaks increase with an increase in boron contents. The latter results from the difficulty of the homogeneous deformation due to active cross-slip because the stacking fault energy decreases with boron. The total AE event counts near yield point increase with boron, implying that boron atoms acts as interstitials in Ni3Al and their frictional drag acts as AE source. Furthermore, the inhomogeneous dislocation motion not from the cross-slip may generate AE during the second peak.","Tensile testing of Ni3Al intermetallic compound single crystals with no additive, 0.25 and 0.50at.% boron has been performed using acoustic emission(AE) method in order to examine the interaction between boron atoms and mobile dislocations. Boron additives increase the yield strength of Ni3Al by 276 MPa/at.%. AE event rates have two peaks at yield point and in work-hardening region. The peak event rates and the distance between these peaks increase with an increase in boron contents. The latter results from the difficulty of the homogeneous deformation due to active cross-slip because the stacking fault energy decreases with boron. The total AE event counts near yield point increase with boron, implying that boron atoms acts as interstitials in Ni3Al and their frictional drag acts as AE source. Furthermore, the inhomogeneous dislocation motion not from the cross-slip may generate AE during the second peak.","null","null","2005-12-01","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.23","null","189","195","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "表面および界面を伝搬するガイド波によるポリマーライニング材の膜厚さと界面剥離の評価法","表面および界面を伝搬するガイド波によるポリマーライニング材の膜厚さと界面剥離の評価法","南 一志, 長 秀雄, 水谷 義弘, 竹本 幹男, 西野 秀郎","Kazushi Minami, Hideo Cho, Yoshihiro Mizutani, Mikio Takemoto, Hideo Nishino","null","弾性表面波,セザワ波,表面伝搬縦波などと特徴を用いたポリマーライニング材の膜厚と界面剥離の検出方法について示した.","弾性表面波,セザワ波,表面伝搬縦波などと特徴を用いたポリマーライニング材の膜厚と界面剥離の検出方法について示した.","null","null","2005-05","非破壊検査","Journal of JSNDI","Vol.54","No.5","null","null","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "ガイド波非対称モードの抽出","ガイド波非対称モードの抽出","林 高弘, 池田 隆, 西野 秀郎","林 高弘, 池田 隆, Hideo Nishino","null","本論文では,ガイド波非軸対象モードを効果的に利用するために必要な非軸対象モードの抽出を定式化し,実験により検証した.非軸対象モード抽出理論は,円周方向変位分布を示す指数関数の直交性を利用して導くことが出来た.モード抽出実験には,非接触であるためガイド波を安定して送受信可能である磁歪型センサーを用いた.理論の示すように,4sつのセンサーは位置に対して,1次の非軸対象モードまで抽出することが出来た.","本論文では,ガイド波非軸対象モードを効果的に利用するために必要な非軸対象モードの抽出を定式化し,実験により検証した.非軸対象モード抽出理論は,円周方向変位分布を示す指数関数の直交性を利用して導くことが出来た.モード抽出実験には,非接触であるためガイド波を安定して送受信可能である磁歪型センサーを用いた.理論の示すように,4sつのセンサーは位置に対して,1次の非軸対象モードまで抽出することが出来た.","null","null","2004-04","非破壊検査","Journal of JSNDI","Vol.53","No.4","223","229","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "光ファイバーAEモニタリングを用いたラム波AEの音源位置評定","光ファイバーAEモニタリングを用いたラム波AEの音源位置評定","松尾 卓摩, 水谷 義弘, 西野 秀郎, 竹本 幹男","松尾 卓摩, 水谷 義弘, Hideo Nishino, 竹本 幹男","null","光ファイバーAEモニタリングシステムを構築し,ラム波による音源位置評定を行った.マイケルソン型の干渉計を構築し,硬球落下によるA0ラム波を検出しファイバーからの最短距離に反応することを確認した.この方式のセンサーを2つ用いることで,音源位置を推定出来ることを示し,硬球落下による実験から13%の測定誤差で推定出来ることを示した.マッハツェンダー型のAEシステムの構築も行い,マイケルソン型の30倍の感度があることを確認した.このシステムでは,音源位置5.5%の精度で推定出来ることを示した.","光ファイバーAEモニタリングシステムを構築し,ラム波による音源位置評定を行った.マイケルソン型の干渉計を構築し,硬球落下によるA0ラム波を検出しファイバーからの最短距離に反応することを確認した.この方式のセンサーを2つ用いることで,音源位置を推定出来ることを示し,硬球落下による実験から13%の測定誤差で推定出来ることを示した.マッハツェンダー型のAEシステムの構築も行い,マイケルソン型の30倍の感度があることを確認した.このシステムでは,音源位置5.5%の精度で推定出来ることを示した.","null","null","2003-03","非破壊検査","Journal of JSNDI","Vol.52","No.3","137","142","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "Acoustic Fields of Bulk Acoustic Waves Excited by Phase Velocity Scanning of Laser Interference Fringes","Acoustic Fields of Bulk Acoustic Waves Excited by Phase Velocity Scanning of Laser Interference Fringes","Hideo Nishino, Takemoto Mikio, Tsukahara Yusuke, Yamanaka Kazushi","Hideo Nishino, Takemoto Mikio, Tsukahara Yusuke, Yamanaka Kazushi","null","周波数の異なる2本のレーザービームを固体試料表面で交差干渉させることで発生する走査干渉縞でバルク波を励起する方法に関して,詳細なる理論的検討を示した.基礎となる方程式は,非同時波動方程式と非同時熱伝導方程式の連立となり,それらを波数空間上で解く手法を用いている.得られた結果からは,指向特性が走査時間とスポット径に強く依存し,単一ビームから形成される指向性関数の積分で示されることを示した.この結果からは,横波では特に励起不可能な指向角が存在し,それは材料物性に依存することを示した.これらの関係は,過去に出された実験結果を良く説明することを示した.","周波数の異なる2本のレーザービームを固体試料表面で交差干渉させることで発生する走査干渉縞でバルク波を励起する方法に関して,詳細なる理論的検討を示した.基礎となる方程式は,非同時波動方程式と非同時熱伝導方程式の連立となり,それらを波数空間上で解く手法を用いている.得られた結果からは,指向特性が走査時間とスポット径に強く依存し,単一ビームから形成される指向性関数の積分で示されることを示した.この結果からは,横波では特に励起不可能な指向角が存在し,それは材料物性に依存することを示した.これらの関係は,過去に出された実験結果を良く説明することを示した.","null","null","2002-04-15","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.41","No.4A","2256","2261","eng","true","null","scientific_journal","null","null","10.1143/JJAP.41.2256","0021-4922","null","http://ci.nii.ac.jp/naid/110006341146/","null","null","null" "レーザー励起レイリー波解析による断熱溶射被膜の高温界面性状の推定","レーザー励起レイリー波解析による断熱溶射被膜の高温界面性状の推定","古川 勉, 水谷 義弘, 西野 秀郎, 竹本 幹男","古川 勉, 水谷 義弘, Hideo Nishino, 竹本 幹男","null","照射被膜(Zirconia/NiCrAlY/SUS304)の界面品質をレーザー励起の弾性表面波の音速定量測定によって推定した.非接触のレーザー超音波システムを用いて弾性表面波を励起検出するシステムを用いて実験を行った.実験結果は,理論で示されるマルチレイヤーの群速度分散曲線に良く一致することを示し,各層にスリップレイヤーを導入することで,界面性状の推定を行った.c44の値が大きく変化することを示し.この値から密着性が評価出来ることを示した.","照射被膜(Zirconia/NiCrAlY/SUS304)の界面品質をレーザー励起の弾性表面波の音速定量測定によって推定した.非接触のレーザー超音波システムを用いて弾性表面波を励起検出するシステムを用いて実験を行った.実験結果は,理論で示されるマルチレイヤーの群速度分散曲線に良く一致することを示し,各層にスリップレイヤーを導入することで,界面性状の推定を行った.c44の値が大きく変化することを示し.この値から密着性が評価出来ることを示した.","null","null","2002-04","非破壊検査","Journal of JSNDI","Vol.51","No.4","217","222","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "円筒形タンク底板に音源を持つAEの位置評定 --- 小型モデルタンクを用いた実験的検証","円筒形タンク底板に音源を持つAEの位置評定 --- 小型モデルタンクを用いた実験的検証","山田 博一, 藍原 武史, 水谷 義弘, 西野 秀郎, 竹本 幹男","山田 博一, 藍原 武史, 水谷 義弘, Hideo Nishino, 竹本 幹男","null","直径820mmの小型円筒タンクを用いて,タンク底板に音源が有るときの音源位置評定方法について,タンクの側面にセンサーを設置した場合について実験を行った.得られる波形には,水中を伝わってくる縦波と底板と側面の板を伝わるラム波から成ることが確認出来た.それらの波をWavelet変換を利用することで最適な周波数に限定して,位置評定を行うことで,高い推定精度が得られることを示した.","直径820mmの小型円筒タンクを用いて,タンク底板に音源が有るときの音源位置評定方法について,タンクの側面にセンサーを設置した場合について実験を行った.得られる波形には,水中を伝わってくる縦波と底板と側面の板を伝わるラム波から成ることが確認出来た.それらの波をWavelet変換を利用することで最適な周波数に限定して,位置評定を行うことで,高い推定精度が得られることを示した.","null","null","2002-02-01","非破壊検査","Journal of JSNDI","Vol.51","No.2","105","110","jpn","true","null","scientific_journal","null","null","null","0367-5866","null","http://ci.nii.ac.jp/naid/10007762279/","null","null","null" "Estimation of five elastic coefficients of uni-directional glass fiber reinforced plastics by laser generated ultrasonic","Estimation of five elastic coefficients of uni-directional glass fiber reinforced plastics by laser generated ultrasonic","Iwasawa Masayuki, Mizutani Yoshihiko, Hideo Nishino, Takemoto Mikio, Ono Kanji","Iwasawa Masayuki, Mizutani Yoshihiko, Hideo Nishino, Takemoto Mikio, Ono Kanji","null","レーザーISO-ANGULAR法を用いて単一指向性のGFRP材の弾性係数5つを推定する手法を示した.c33, c11, c66, c44はファイバー方向とファイバー方向に垂直な方向に伝搬する純縦波と純横波の音速を測定することで決定した.c13に関しては,理論的な音速値をc13を変えながら凖横波の計算を行い,その値と実験的に得られた凖横波の値が基も近い値を採用する方法で決定した.本方法は,水侵法で詳しく計測した値とほぼ一致する結果を得ており,ドライ環境中での弾性係数の推定方法を確立した.","レーザーISO-ANGULAR法を用いて単一指向性のGFRP材の弾性係数5つを推定する手法を示した.c33, c11, c66, c44はファイバー方向とファイバー方向に垂直な方向に伝搬する純縦波と純横波の音速を測定することで決定した.c13に関しては,理論的な音速値をc13を変えながら凖横波の計算を行い,その値と実験的に得られた凖横波の値が基も近い値を採用する方法で決定した.本方法は,水侵法で詳しく計測した値とほぼ一致する結果を得ており,ドライ環境中での弾性係数の推定方法を確立した.","null","null","2002-02","Advanced Composite Materials","Advanced Composite Materials","Vol.11","No.2","121","135","eng","true","null","scientific_journal","null","null","10.1163/156855102760410324","0924-3046","null","http://ci.nii.ac.jp/naid/10010456049/","null","null","null" "誘導波AE解析による繊維強化円筒の損傷進展","誘導波AE解析による繊維強化円筒の損傷進展","林 淑恵, 水谷 義弘, 西野 秀郎, 竹本 幹男","林 淑恵, 水谷 義弘, Hideo Nishino, 竹本 幹男","null","ガイド波AEの解析によって複雑繊維強化パイプの側面圧縮による損傷発生位置と損傷タイプの分類を行った.Wavelet変換を利用してL(0,1)モードとF(1,1)モードを用いることで軸方向の音源位置は推定できた.局部圧縮では,長さ/直径が大きい場合では,軸方向繊維のsplittingと繊維破断が主であった.レーザー超音波法とAEモーダル解析によって繊維破断とsplittingの分類を可能とした.","ガイド波AEの解析によって複雑繊維強化パイプの側面圧縮による損傷発生位置と損傷タイプの分類を行った.Wavelet変換を利用してL(0,1)モードとF(1,1)モードを用いることで軸方向の音源位置は推定できた.局部圧縮では,長さ/直径が大きい場合では,軸方向繊維のsplittingと繊維破断が主であった.レーザー超音波法とAEモーダル解析によって繊維破断とsplittingの分類を可能とした.","null","null","2002-02","日本複合材料学会誌","Journal of the Japan Society for Composite Materials","Vol.28","No.2","66","77","jpn","true","null","scientific_journal","null","null","10.6089/jscm.28.66","0385-2563","null","http://ci.nii.ac.jp/naid/10007829117/","null","null","null" "剛球衝突を受けるクロスプライDFRPのラム波AEとたわみ解析による衝撃力の計測と損傷評価","剛球衝突を受けるクロスプライDFRPのラム波AEとたわみ解析による衝撃力の計測と損傷評価","水谷 義弘, 網野 正剛, 西野 秀郎, 竹本 幹男, 小野 桓司","水谷 義弘, 網野 正剛, Hideo Nishino, 竹本 幹男, 小野 桓司","null","クロスプライCFRP板の剛球衝突実験を行い板のたわみとラム波から衝撃力の推定を行った.クロスプライCFRP板の破壊には,クロスプライCFRP板のたわみ量が大きく関与するが,ラム波の伝搬は,破壊よりも速く伝搬するために破壊によるエネルギー収支の影響はラム波には比較的小さな影響しか及ぼさないことを示し,ラム波の挙動から推定される衝撃力が比較的事実に近いことを示し,衝撃力のモニタリングに最適であることを示した.","クロスプライCFRP板の剛球衝突実験を行い板のたわみとラム波から衝撃力の推定を行った.クロスプライCFRP板の破壊には,クロスプライCFRP板のたわみ量が大きく関与するが,ラム波の伝搬は,破壊よりも速く伝搬するために破壊によるエネルギー収支の影響はラム波には比較的小さな影響しか及ぼさないことを示し,ラム波の挙動から推定される衝撃力が比較的事実に近いことを示し,衝撃力のモニタリングに最適であることを示した.","null","null","2001-09","材料","Journal of the Society of Materials Science, Japan","Vol.50","No.9","1036","1041","jpn","true","null","scientific_journal","null","null","10.2472/jsms.50.1036","1880-7488","null","null","null","null","null" "ラム波AE解析によるGFRPタンクの損傷ゾーン評定","ラム波AE解析によるGFRPタンクの損傷ゾーン評定","水谷 義弘, 府川 則史, 二木 宗, 西野 秀郎, 竹本 幹男","水谷 義弘, 府川 則史, 二木 宗, Hideo Nishino, 竹本 幹男","null","GFRPのタンクにおけるAEによる新しい損傷位置評定法を示した.ここで用いるような複雑な構造物では,破壊による直接的なAEと同時に,ノイズとなる2次AEを除去することが最重要となる.これらを分類するために,wavelet変換を用いて周波数領域で信号を分離して精度を上げた.得られた結果から,評定精度は板厚の1.6倍以内であった.","GFRPのタンクにおけるAEによる新しい損傷位置評定法を示した.ここで用いるような複雑な構造物では,破壊による直接的なAEと同時に,ノイズとなる2次AEを除去することが最重要となる.これらを分類するために,wavelet変換を用いて周波数領域で信号を分離して精度を上げた.得られた結果から,評定精度は板厚の1.6倍以内であった.","null","null","2001-05","非破壊検査","Journal of JSNDI","Vol.50","No.5","314","320","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "Modal analysis of cylinrdical guided wave and applications","Modal analysis of cylinrdical guided wave and applications","Hideo Nishino, Takashina Sunao, Takemoto Mikio, Ono Kanji","Hideo Nishino, Takashina Sunao, Takemoto Mikio, Ono Kanji","null","パイプの長手方向に伝搬するガイド波の分散関係を詳細に理論的かつ実験的に検証した.ラム波との詳細な比較によって,その類似点を示した.本論文での特出すべき内容は,物理的伝搬挙動を基にしたガイド波の再定義である.これまでの古典的な定義では,不都合が生じる点を数学的に明解に定義を行い.明瞭に区分けされた.実験では,レーザー超音波法による広帯域な検証実験を行い,理論値と非常に良く一致した結果を得ることが出来た.励振効率は,F(1,1)モードで非常に大きく,そのほかでもL(0,1),F(2,1),L(0,2),F(1,2),F(2,2)が良く励起されることが確認できた.","パイプの長手方向に伝搬するガイド波の分散関係を詳細に理論的かつ実験的に検証した.ラム波との詳細な比較によって,その類似点を示した.本論文での特出すべき内容は,物理的伝搬挙動を基にしたガイド波の再定義である.これまでの古典的な定義では,不都合が生じる点を数学的に明解に定義を行い.明瞭に区分けされた.実験では,レーザー超音波法による広帯域な検証実験を行い,理論値と非常に良く一致した結果を得ることが出来た.励振効率は,F(1,1)モードで非常に大きく,そのほかでもL(0,1),F(2,1),L(0,2),F(1,2),F(2,2)が良く励起されることが確認できた.","null","null","2001-01","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.40","No.1A","364","370","eng","true","null","scientific_journal","null","null","10.1143/JJAP.40.364","0021-4922","null","null","null","null","null" "Fracture dynamics in notched PMMA plates by Lamb wave AE analysis","Fracture dynamics in notched PMMA plates by Lamb wave AE analysis","Nagashima Kenji, Hideo Nishino, Takemoto Mikio, Ono Kanji","Nagashima Kenji, Hideo Nishino, Takemoto Mikio, Ono Kanji","null","実験的に求めた系の伝達関数をもちいたLamb波伝搬シミュレーションと,AE波解析を用いることで,PMMAの不規則破壊とクレージング(環境微細亀裂;ケミカルクラック)の挙動解析を行った.不規則破壊においては,表面亀裂法と併用することで,不規則破壊が起きていることを確認した.クレージングの計測では,増幅率を挙げて実験した結果,不規則破壊の大きさの10の5乗程小さい値が得られることを初めて観察出来た.立上がり時間の推定では,不規則破壊では,10の-6乗オーダーと不規則破壊とクレージングで大きな差異は見られなかった.50%のメタノール環境でのクレージングで,10の-7乗から10の-6乗の破壊速度であることが推定出来た.","実験的に求めた系の伝達関数をもちいたLamb波伝搬シミュレーションと,AE波解析を用いることで,PMMAの不規則破壊とクレージング(環境微細亀裂;ケミカルクラック)の挙動解析を行った.不規則破壊においては,表面亀裂法と併用することで,不規則破壊が起きていることを確認した.クレージングの計測では,増幅率を挙げて実験した結果,不規則破壊の大きさの10の5乗程小さい値が得られることを初めて観察出来た.立上がり時間の推定では,不規則破壊では,10の-6乗オーダーと不規則破壊とクレージングで大きな差異は見られなかった.50%のメタノール環境でのクレージングで,10の-7乗から10の-6乗の破壊速度であることが推定出来た.","null","null","2001","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.19","null","11","21","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "Estimation of impact dynamics bu using Simplex assisted waveform simulation of Lamb wave AE","Estimation of impact dynamics bu using Simplex assisted waveform simulation of Lamb wave AE","Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","null","シンプレックス法を応用した物体の衝突履歴(力の履歴,大きさ,時間分布)を発生するAE波の解析から推定する手法を示した.AE波からの推定には基本的には計算で求めた波形と,実験波形の比較により行った.実験では,衝撃の大きさをPZT素子を用いて測定し,衝突速度と衝撃力の関係を求めた.この関係を基に,CFRPに10-40m/sで小球を衝突させ,衝撃力を上記手法を用いて推定し,衝突速度とともに衝撃力が増加することを示した.しかし,板が薄くなると,衝撃力がたわみ振動にも活用され,破壊が起こりにくいことを,示した.破壊前までは計算結果と比較的良く一致する波形解析も,破壊により計算結果との一致が小さくなることを示した.この値を利用することで,破壊の程度を推定することも可能であることを示した.","シンプレックス法を応用した物体の衝突履歴(力の履歴,大きさ,時間分布)を発生するAE波の解析から推定する手法を示した.AE波からの推定には基本的には計算で求めた波形と,実験波形の比較により行った.実験では,衝撃の大きさをPZT素子を用いて測定し,衝突速度と衝撃力の関係を求めた.この関係を基に,CFRPに10-40m/sで小球を衝突させ,衝撃力を上記手法を用いて推定し,衝突速度とともに衝撃力が増加することを示した.しかし,板が薄くなると,衝撃力がたわみ振動にも活用され,破壊が起こりにくいことを,示した.破壊前までは計算結果と比較的良く一致する波形解析も,破壊により計算結果との一致が小さくなることを示した.この値を利用することで,破壊の程度を推定することも可能であることを示した.","null","null","2001","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.19","null","null","null","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "Guided wave analysis for source location and fracture dynamics of stress corrosion cracking of brass tube","Guided wave analysis for source location and fracture dynamics of stress corrosion cracking of brass tube","Uchida Fukutoshi, Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","Uchida Fukutoshi, Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","null","パイプを伝搬するガイド波の特徴を用いて,パイプの欠陥位置評定および破壊挙動解析法を構築した.L(0,1)modeとF(1,1)modeは最適な周波数を選択することで,他のモードに影響を受けることなく,利用出来るモードであり,その群速度差を利用することで軸方向の位置評定が可能であることを示している.アンモニアによる黄銅の応力腐食割れの破壊では最大で6%の推定誤差で位置評定が可能であることを確認している.破壊挙動解析では,L(0,1)modeを用いた波形シミュレーションより高速な粒界割れがアンモニア応力腐食割れが原因で発生していることを,電子顕微鏡写真での破壊面観察との比較を行うことで確認できた","パイプを伝搬するガイド波の特徴を用いて,パイプの欠陥位置評定および破壊挙動解析法を構築した.L(0,1)modeとF(1,1)modeは最適な周波数を選択することで,他のモードに影響を受けることなく,利用出来るモードであり,その群速度差を利用することで軸方向の位置評定が可能であることを示している.アンモニアによる黄銅の応力腐食割れの破壊では最大で6%の推定誤差で位置評定が可能であることを確認している.破壊挙動解析では,L(0,1)modeを用いた波形シミュレーションより高速な粒界割れがアンモニア応力腐食割れが原因で発生していることを,電子顕微鏡写真での破壊面観察との比較を行うことで確認できた","null","null","2001","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.19","null","75","84","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "Damege detection in a fiber reinforced cylinder (fishing rod) by guided wave acoustic emission analysis","Damege detection in a fiber reinforced cylinder (fishing rod) by guided wave acoustic emission analysis","Yoshie Hayashi, Yoshihiro Mizutani, Hideo Nishino, Mikio Takemoto, Kanji Ono","Yoshie Hayashi, Yoshihiro Mizutani, Hideo Nishino, Mikio Takemoto, Kanji Ono","null","繊維強化材で作成されたパイプのガイド波を用いた破壊AEの位置評定結果と引張試験における破壊挙動を示した.ここで用いたパイプは,釣りざおに使用されるいる物で,グラスファイバーとカーボンファイバーをスパイラルに巻付けた構造となっている.軸方向の伝搬速度を求めることで,簡便に分散曲線を推定する方法を示し,L(0,1)とF(1,1)モードにおいて実験値と比較的近い関係が得られている.位置評定では,円周方向の3分割を含め80%の正解率で推定出来た.引張における破壊挙動では,初期亀裂の発生から連続的に亀裂が進展し,破断する様子が観測出来た.","繊維強化材で作成されたパイプのガイド波を用いた破壊AEの位置評定結果と引張試験における破壊挙動を示した.ここで用いたパイプは,釣りざおに使用されるいる物で,グラスファイバーとカーボンファイバーをスパイラルに巻付けた構造となっている.軸方向の伝搬速度を求めることで,簡便に分散曲線を推定する方法を示し,L(0,1)とF(1,1)モードにおいて実験値と比較的近い関係が得られている.位置評定では,円周方向の3分割を含め80%の正解率で推定出来た.引張における破壊挙動では,初期亀裂の発生から連続的に亀裂が進展し,破断する様子が観測出来た.","null","null","2001","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.19","null","35","44","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "レーザー干渉縞の位相速度走査による集束超音波の励起","レーザー干渉縞の位相速度走査による集束超音波の励起","西野 秀郎, 中曽 教尊, 塚原 裕輔, 山中 一司","Hideo Nishino, 中曽 教尊, 塚原 裕輔, 山中 一司","null","固体試料表面に周波数の異なる2本のレーザービームを交差干渉させることで発生する走査干渉縞を用いた指向性バルク波の励起手法について述べた.走査速度を材料のバルク波速度よりも大きくすることで内部に制御された指向性を有するバルク波を励起出来る.この走査速度を空間的に最適に分布させることで,材料中の任意の1点に集束していくバルク超音波を励起出来ることを示した.簡単なレイトレースモデルを用いた原理の説明を始めに示した.後半では,平面波レーザーとレンズ系で構築した球面波レーザーを試料表面で干渉させることで,中央に行くほど小さい波長を有する同心円状の走査干渉縞を作成し,実験検証を行った.結果はレイトレースモデルの結果に近い値を示し,さらに焦点距離の変更も簡便に行えることを示した.","固体試料表面に周波数の異なる2本のレーザービームを交差干渉させることで発生する走査干渉縞を用いた指向性バルク波の励起手法について述べた.走査速度を材料のバルク波速度よりも大きくすることで内部に制御された指向性を有するバルク波を励起出来る.この走査速度を空間的に最適に分布させることで,材料中の任意の1点に集束していくバルク超音波を励起出来ることを示した.簡単なレイトレースモデルを用いた原理の説明を始めに示した.後半では,平面波レーザーとレンズ系で構築した球面波レーザーを試料表面で干渉させることで,中央に行くほど小さい波長を有する同心円状の走査干渉縞を作成し,実験検証を行った.結果はレイトレースモデルの結果に近い値を示し,さらに焦点距離の変更も簡便に行えることを示した.","null","null","2000","非破壊検査","Journal of JSNDI","Vol.49","No.5","313","317","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "Lamb wave source location of impact on anisotropic plate","Lamb wave source location of impact on anisotropic plate","Yamada Hirokazu, Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","Yamada Hirokazu, Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","null","異方性を有するCFRP板を伝搬するラム波を用いた新しい音源位置評定方法を示す.シャーペン芯の圧折と鉄球の落下を音源として模擬AEを発生させ,300mmスクエアの頂点にAEセンサーを設置した500mmスクエアのCFRP板を用いて実験を行った.音源位置評定には,ラム波のAoモードの65kHz成分を用いた.音源位置の推定では,音響異方性を考慮して伝搬時間を計算し推定している.結果,単一指向性のCFRPでは300mmスクエアで誤差5.6mm,疑似等方性のCFRPでは,2.4mmの誤差で音源位置を推定することが出来た.","異方性を有するCFRP板を伝搬するラム波を用いた新しい音源位置評定方法を示す.シャーペン芯の圧折と鉄球の落下を音源として模擬AEを発生させ,300mmスクエアの頂点にAEセンサーを設置した500mmスクエアのCFRP板を用いて実験を行った.音源位置評定には,ラム波のAoモードの65kHz成分を用いた.音源位置の推定では,音響異方性を考慮して伝搬時間を計算し推定している.結果,単一指向性のCFRPでは300mmスクエアで誤差5.6mm,疑似等方性のCFRPでは,2.4mmの誤差で音源位置を推定することが出来た.","null","null","2000","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.18","No.12","51","60","eng","true","null","scientific_journal","null","null","null","0730-0050","null","http://ci.nii.ac.jp/naid/80015255922/","null","null","null" "A novel method of AE source location in pipes using cylindrical guided waves","A novel method of AE source location in pipes using cylindrical guided waves","Hideo Nishino, Uchida Fukutoshi, Takashina Sunao, Takemoto Mikio, Ono Kanji","Hideo Nishino, Uchida Fukutoshi, Takashina Sunao, Takemoto Mikio, Ono Kanji","null","1つのAEセンサーをパイプに設置することで,音源位置評定を行う手法について,ガイド波を用いた新しい方法を示す.軸方向における位置評定では,L(0,1)とF(1,1)の群速度に依存する到達時間差を用いることでおこなう.その際,事前に決定しておいた周波数成分における成分を抽出するためにウエーブレット変換を用いた.結果,5%の誤差で同定することが可能であった.円周方向における位置評定では,F(1,1)モードの円周方向における位相検出によって実現している.","1つのAEセンサーをパイプに設置することで,音源位置評定を行う手法について,ガイド波を用いた新しい方法を示す.軸方向における位置評定では,L(0,1)とF(1,1)の群速度に依存する到達時間差を用いることでおこなう.その際,事前に決定しておいた周波数成分における成分を抽出するためにウエーブレット変換を用いた.結果,5%の誤差で同定することが可能であった.円周方向における位置評定では,F(1,1)モードの円周方向における位相検出によって実現している.","null","null","2000","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.18","null","102","110","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "Dynamics and damage assessment in impact crossply CFRP plate utilizing the waveformsimulation of Lamb wave acoustic emission","Dynamics and damage assessment in impact crossply CFRP plate utilizing the waveformsimulation of Lamb wave acoustic emission","Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","Mizutani Yoshihiro, Hideo Nishino, Takemoto Mikio, Ono Kanji","null","ラム波AEのシンプレックス法による波形解析を用いることで,10-43m/sで飛翔する鉄球によるCFRP材の破壊履歴を同定することに成功した.計算された衝撃力は,エネルギーバランスとバネマスモデルで計算された方法と比較も行った.2者は非常に良く一致することを示せた.臨界的な鉄球の衝突速度は,板のまげをモニタリングすることで予想出来ることを示した.","ラム波AEのシンプレックス法による波形解析を用いることで,10-43m/sで飛翔する鉄球によるCFRP材の破壊履歴を同定することに成功した.計算された衝撃力は,エネルギーバランスとバネマスモデルで計算された方法と比較も行った.2者は非常に良く一致することを示せた.臨界的な鉄球の衝突速度は,板のまげをモニタリングすることで予想出来ることを示した.","null","null","2000","Journal of Acoustic Emission","Journal of Acoustic Emission","Vol.18","null","286","292","eng","true","null","scientific_journal","null","null","null","0730-0050","null","null","null","null","null" "小型丸棒試験片を用いる環境脆化割れ解析のための誘導波AE解析","小型丸棒試験片を用いる環境脆化割れ解析のための誘導波AE解析","竹本 幹男, 内田 福年, 佐藤 輝嘉, 水谷 義弘, 西野 秀郎, 山崎 慎吾","竹本 幹男, 内田 福年, 佐藤 輝嘉, 水谷 義弘, Hideo Nishino, 山崎 慎吾","null","応力腐食割れや遅れ破壊などの環境脆化割れの進展具合を定量的に考察·解析する目的として,丸棒を伝搬するガイド波の特徴を活かして方法を示す.ガイド波の検出には,丸棒の外表面に設置した2つのAEセンサーにて行った.丸棒を伝搬するガイド波では,対象モードと非対称モードに大別されるモードを用いることで,割れの位置や進展を観測することに成功している.また,破壊モードの同定や破壊速度の同定も可能とし,動的な割れの評価の広く使えることを示した.","応力腐食割れや遅れ破壊などの環境脆化割れの進展具合を定量的に考察·解析する目的として,丸棒を伝搬するガイド波の特徴を活かして方法を示す.ガイド波の検出には,丸棒の外表面に設置した2つのAEセンサーにて行った.丸棒を伝搬するガイド波では,対象モードと非対称モードに大別されるモードを用いることで,割れの位置や進展を観測することに成功している.また,破壊モードの同定や破壊速度の同定も可能とし,動的な割れの評価の広く使えることを示した.","null","null","1999-11","材料と環境","材料と環境","Vol.48","No.11","733","738","jpn","true","null","scientific_journal","null","null","null","null","null","null","null","null","null" "Density measurement of thin glass layers for gas barrier films","Density measurement of thin glass layers for gas barrier films","Norihito Fukugami, Hideo Nishino, Masaaki Yanaka, Kozue Tomiyama, Yusuke Tsukahara","Norihito Fukugami, Hideo Nishino, Masaaki Yanaka, Kozue Tomiyama, Yusuke Tsukahara","null","高分子フィルム上に蒸着で作成された10-100メートルオーダーのSiOx薄膜の密度計測方法を示した.密度の正確な計測と制御は,薄膜の機能発現のためには欠かせないプロセルである.シリコン単結晶上に作成したSiOx薄膜に対し,リソグラフを用いて縞状に薄膜を除去しAFMによる詳細計測で実現させた.結果,蒸着条件により異なるが,2.14-2.19g/cm3の値を得ることが出来た.詳しい測定方法と結果を示す.","高分子フィルム上に蒸着で作成された10-100メートルオーダーのSiOx薄膜の密度計測方法を示した.密度の正確な計測と制御は,薄膜の機能発現のためには欠かせないプロセルである.シリコン単結晶上に作成したSiOx薄膜に対し,リソグラフを用いて縞状に薄膜を除去しAFMによる詳細計測で実現させた.結果,蒸着条件により異なるが,2.14-2.19g/cm3の値を得ることが出来た.詳しい測定方法と結果を示す.","null","null","1999-07","Journal of Vacuum Science & Technology A","Journal of Vacuum Science & Technology A","Vol.A17","No.4","1840","1842","eng","true","null","scientific_journal","null","null","10.1116/1.581901","0734-2101","null","null","null","null","null" "Estimation of elastic constants from surface acoustic wave velocity by inverse analysis using the inverse simplex method","Estimation of elastic constants from surface acoustic wave velocity by inverse analysis using the inverse simplex method","Harumichi Sato, Hideo Nishino, Hideo Cho, Hisato Ogiso, Kazushi Yamanaka","Harumichi Sato, Hideo Nishino, Hideo Cho, Hisato Ogiso, Kazushi Yamanaka","null","弾性表面波が材料表面近傍の弾性率を反映して伝搬することを利用し,その音速を測定することで,材料表面近傍の弾性率の測定を行う.計測音速値からの弾性率の推定には,モンテカルロ法と単純ダウンヒル法を用いた.初期値にはランダム数を利用して計算を行い,ローカルミニマムに落ち込まないように配慮した.実験には走査干渉縞方式のレーザー超音波法を用いた.結果,シリコン単結晶で非常に良く一致した結果を得た.また応用的観点から水晶の弾性率評価も行ったので報告する.","弾性表面波が材料表面近傍の弾性率を反映して伝搬することを利用し,その音速を測定することで,材料表面近傍の弾性率の測定を行う.計測音速値からの弾性率の推定には,モンテカルロ法と単純ダウンヒル法を用いた.初期値にはランダム数を利用して計算を行い,ローカルミニマムに落ち込まないように配慮した.実験には走査干渉縞方式のレーザー超音波法を用いた.結果,シリコン単結晶で非常に良く一致した結果を得た.また応用的観点から水晶の弾性率評価も行ったので報告する.","null","null","1998-05","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.37","No.5B","3116","3119","eng","true","null","scientific_journal","null","null","null","0021-4922","null","null","null","null","null" "Evaluation of surface defects using surface acoustic waves generated by phase velocity scanning of laser intference fringes","Evaluation of surface defects using surface acoustic waves generated by phase velocity scanning of laser intference fringes","Harumichi Sato, Hideo Cho, Hideo Nishino, Hisato Ogiso, Kazushi Yamanaka","Harumichi Sato, Hideo Cho, Hideo Nishino, Hisato Ogiso, Kazushi Yamanaka","null","周波数の異なる2本のレーザービームを固体試料表面に交差干渉させることで発せさせる走査干渉縞を用いて高振幅のレイリー波をシリコン単結晶上に励起し,シリコン単結晶上に作成された人工欠陥の検出実験を行った.人工欠陥は,ヌープ圧子を25gf,50fg,100gf,200gf,300gfの5種類で押し込むことで作成した.100fgのときに亀裂開講が30ミクロン程度となったが,その際には明確な反射波を検出することが出来た.また,試料エッジでの多重反射などの詳しい解析を行っている.","周波数の異なる2本のレーザービームを固体試料表面に交差干渉させることで発せさせる走査干渉縞を用いて高振幅のレイリー波をシリコン単結晶上に励起し,シリコン単結晶上に作成された人工欠陥の検出実験を行った.人工欠陥は,ヌープ圧子を25gf,50fg,100gf,200gf,300gfの5種類で押し込むことで作成した.100fgのときに亀裂開講が30ミクロン程度となったが,その際には明確な反射波を検出することが出来た.また,試料エッジでの多重反射などの詳しい解析を行っている.","null","null","1996-05","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.35","No.5B","3066","3069","eng","true","null","scientific_journal","null","null","null","0021-4922","null","null","null","null","null" "SAW velocity measuremet of crystals and thin films by the phase velocity scanning of laser interfeence fringe","SAW velocity measuremet of crystals and thin films by the phase velocity scanning of laser interfeence fringe","Kazushi Yamanaka, Yoshihiko Nagata, Toshio Koda, Hideo Nishino, Yusuke Tsukahara, Hideo Cho, Masatoshi Inaba, Akinobu Sato","Kazushi Yamanaka, Yoshihiko Nagata, Toshio Koda, Hideo Nishino, Yusuke Tsukahara, Hideo Cho, Masatoshi Inaba, Akinobu Sato","null","周波数の異なる2本のレーザービームを固体試料表面に交差干渉させることで発せさせる走査干渉縞を用いて高振幅のレイリー波をシリコン単結晶およびシリコン単結晶状に作成した窒化シリコン薄膜の弾性的性質の計測を行った.検出には工学的ナイフエッジ法による非接触方式を用いることで,完全非接触で実験を行った.その結果,シリコン単結晶での音響異方性の結果はもとより,窒化シリコン薄膜によって,表面の弾性率が向上していることが確認出来た.ミクロンオーダーの薄膜の弾性計測が可能であることを示した.","周波数の異なる2本のレーザービームを固体試料表面に交差干渉させることで発せさせる走査干渉縞を用いて高振幅のレイリー波をシリコン単結晶およびシリコン単結晶状に作成した窒化シリコン薄膜の弾性的性質の計測を行った.検出には工学的ナイフエッジ法による非接触方式を用いることで,完全非接触で実験を行った.その結果,シリコン単結晶での音響異方性の結果はもとより,窒化シリコン薄膜によって,表面の弾性率が向上していることが確認出来た.ミクロンオーダーの薄膜の弾性計測が可能であることを示した.","null","null","1995","IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency","IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency","Vol.42","No.3","381","385","eng","true","null","scientific_journal","null","null","10.1109/58.384446","0885-3010","null","null","null","null","null" "Generation and directivity control of bulk acoustic waves by phase velocity scanning of laser interference fringes","Generation and directivity control of bulk acoustic waves by phase velocity scanning of laser interference fringes","Hideo Nishino, Yusuke Tsukahara, Hideo Cho, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","Hideo Nishino, Yusuke Tsukahara, Hideo Cho, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","null","周波数の異なる2本のレーザービームを固体試料表面に照射干渉させることで発生させる走査干渉縞において,レーザービームの入射角を制御することで,その走査速度を材料のバルク波速度よりも大きくすることで,材料内部に指向性を有するバルク超音波を励起する手法に関して示した.すなわち,入射角を狭めることでバルク波の伝搬方向はより垂直方法となることを,理論的·実験的に示した.本手法によれば,非接触でPhasedArray方式の超音波センサーと同様の機能を発現可能であることを示した.","周波数の異なる2本のレーザービームを固体試料表面に照射干渉させることで発生させる走査干渉縞において,レーザービームの入射角を制御することで,その走査速度を材料のバルク波速度よりも大きくすることで,材料内部に指向性を有するバルク超音波を励起する手法に関して示した.すなわち,入射角を狭めることでバルク波の伝搬方向はより垂直方法となることを,理論的·実験的に示した.本手法によれば,非接触でPhasedArray方式の超音波センサーと同様の機能を発現可能であることを示した.","null","null","1995","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.34","No.5B","2874","2878","eng","true","null","scientific_journal","null","null","null","0021-4922","null","null","null","null","null" "Optical probe detection of high-frequency surface acoustic waves generated by pahse velocity scanning of laser interference fringes","Optical probe detection of high-frequency surface acoustic waves generated by pahse velocity scanning of laser interference fringes","Hideo Nishino, Yusuke Tuskahara, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","Hideo Nishino, Yusuke Tuskahara, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","null","レーザーを固体試料表面に照射することで熱弾性効果による100MHz帯のレイリー波の励起を可能にする走査干渉縞方式の位相速度走査法であるが,システムとして完成させるためには,100MHz帯のレイリー波のレーザーによる検出もまた重要である.本報告では,レーザーを用いた検出方法として工学的ナイフエッジ法を用いて実験装置を構築したので報告する.工学的ナイフエッジ法を用いることで,検出時における摂動が無くなり検出されたレイリー波の振幅値の計測も可能となり,1.4nmと推定した.この値は,100MHz帯の超音波としては大振幅であり,走査干渉縞方式の位相速度走査法が高効率であることを定量的に確認出来た.","レーザーを固体試料表面に照射することで熱弾性効果による100MHz帯のレイリー波の励起を可能にする走査干渉縞方式の位相速度走査法であるが,システムとして完成させるためには,100MHz帯のレイリー波のレーザーによる検出もまた重要である.本報告では,レーザーを用いた検出方法として工学的ナイフエッジ法を用いて実験装置を構築したので報告する.工学的ナイフエッジ法を用いることで,検出時における摂動が無くなり検出されたレイリー波の振幅値の計測も可能となり,1.4nmと推定した.この値は,100MHz帯の超音波としては大振幅であり,走査干渉縞方式の位相速度走査法が高効率であることを定量的に確認出来た.","null","null","1994","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.33","No.5B","3260","3264","eng","true","null","scientific_journal","null","null","null","0021-4922","null","null","null","null","null" "Analysis of excitation and coherent amplitude enhancement of surface acoustic waves by the phase velocity scanning method","Analysis of excitation and coherent amplitude enhancement of surface acoustic waves by the phase velocity scanning method","Kazushi Yamanaka, Oleg Kolosov, Yoshihiko Nagata, Toshio Koda, Hideo Nishino, Yusuke Tsukahara","Kazushi Yamanaka, Oleg Kolosov, Yoshihiko Nagata, Toshio Koda, Hideo Nishino, Yusuke Tsukahara","null","レーザーを固体試料表面に照射することで熱弾性効果によるレイリー波の励起に関して,理論的かつ実験的検証を行った.効率的なレイリー波の励起方法である位相速度走査法に関して包括的に示している.位相速度走査法の手法としては,単一レーザー操作方式と走査干渉縞方式がある.それぞれに関して理論的な解析を試み,後半部の実験で得られた結果との比較を行い.効率的励起のメカニズムに関して詳細に示した.すなわち,走査速度が位相速度に等しいときに最も効率的にレイリー波が励起される事実や,走査干渉縞の周波数と励起されるレイリー波の周波数が必ずしも一致しないことを示した.位相速度走査法によるレイリー波の励起に関して,多くの知見を報告している.","レーザーを固体試料表面に照射することで熱弾性効果によるレイリー波の励起に関して,理論的かつ実験的検証を行った.効率的なレイリー波の励起方法である位相速度走査法に関して包括的に示している.位相速度走査法の手法としては,単一レーザー操作方式と走査干渉縞方式がある.それぞれに関して理論的な解析を試み,後半部の実験で得られた結果との比較を行い.効率的励起のメカニズムに関して詳細に示した.すなわち,走査速度が位相速度に等しいときに最も効率的にレイリー波が励起される事実や,走査干渉縞の周波数と励起されるレイリー波の周波数が必ずしも一致しないことを示した.位相速度走査法によるレイリー波の励起に関して,多くの知見を報告している.","null","null","1993","Journal of Applied Physics","Journal of Applied Physics","Vol.74","No.11","6511","6522","eng","true","null","scientific_journal","null","null","null","0021-8979","null","null","null","null","null" "Generation of 100-MHz-band Rayleigh waves by pahse velocity scanning of a laser interference fringe","Generation of 100-MHz-band Rayleigh waves by pahse velocity scanning of a laser interference fringe","Hideo Nishino, Yusuke Tsukahara, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","Hideo Nishino, Yusuke Tsukahara, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","null","レーザーを固体試料表面に照射することで熱弾性効果による100MHz帯のレイリー波の励起について述べた.効率的な励起のために周波数の異なる2本のレーザービームを固体試料表面上で交差干渉させることで発生する走査干渉縞を用いている.この走査干渉縞の走査速度をレイリー波の位相速度に一致させることで,効率的なレイリー波の励起に成功している.論文では,基礎原理とともに励起効率のレーザー入射角依存性や周波数変化について詳細に示した.","レーザーを固体試料表面に照射することで熱弾性効果による100MHz帯のレイリー波の励起について述べた.効率的な励起のために周波数の異なる2本のレーザービームを固体試料表面上で交差干渉させることで発生する走査干渉縞を用いている.この走査干渉縞の走査速度をレイリー波の位相速度に一致させることで,効率的なレイリー波の励起に成功している.論文では,基礎原理とともに励起効率のレーザー入射角依存性や周波数変化について詳細に示した.","null","null","1993","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.32","No.5B","2536","2539","eng","true","null","scientific_journal","null","null","null","0021-4922","null","null","null","null","null" "配管エルボ部の欠陥検出におけるガイド波試験の欠陥検出感度の周波数依存性","Frequency Dependence of the Defect Sensitivity of Guided Wave Testing for Efficient Defect Detection at Pipe Elbows","山本 敏弘, 古川 敬, 西野 秀郎","Toshihiro Yamamotoh, Takashi Furukawa, Hideo Nishino","null","
Guided wave testing offers an efficient screening method for thinning of pipe walls because of its long inspection range and its ability to inspect pipes with limited access. However, the existence of an elbow in pipes makes it difficult to interpret echo signals in guided wave testing. In the present study, to investigate the sensitivity of defect detection at a pipe elbow by guided wave testing, guided wave testing was performed on several 50A Sch 40 aluminum alloy piping specimens of the same configuration that includes an elbow. An artificial defect was produced at one of 12 different locations on the outer surface of the elbow of each piping specimen. The defect signals were observed as the defect depth was gradually increased at each defect location to obtain the defect sensitivity. The transmitted guided wave frequency was in turn set to 30 kHz, 40 kHz, and 50 kHz. At 30 kHz, high sensitivity values were obtained at the intrados of the elbows, whereas at 40 kHz and 50 kHz, high sensitivity values were obtained at their extrados. This paper also shows the results of computer simulations that used the same configuration as that used in the experiments to analyze the propagation behavior of guided waves passing through the elbow. In addition to the experimental results, the simulation results indicate that the defect-sensitive locations are controlled by the guided wave frequency. Thus, proper selection of the excitation frequency for guided wave testing enables defect detection in an intended area of an elbow with high sensitivity.
","Guided wave testing offers an efficient screening method for thinning of pipe walls because of its long inspection range and its ability to inspect pipes with limited access. However, the existence of an elbow in pipes makes it difficult to interpret echo signals in guided wave testing. In the present study, to investigate the sensitivity of defect detection at a pipe elbow by guided wave testing, guided wave testing was performed on several 50A Sch 40 aluminum alloy piping specimens of the same configuration that includes an elbow. An artificial defect was produced at one of 12 different locations on the outer surface of the elbow of each piping specimen. The defect signals were observed as the defect depth was gradually increased at each defect location to obtain the defect sensitivity. The transmitted guided wave frequency was in turn set to 30 kHz, 40 kHz, and 50 kHz. At 30 kHz, high sensitivity values were obtained at the intrados of the elbows, whereas at 40 kHz and 50 kHz, high sensitivity values were obtained at their extrados. This paper also shows the results of computer simulations that used the same configuration as that used in the experiments to analyze the propagation behavior of guided waves passing through the elbow. In addition to the experimental results, the simulation results indicate that the defect-sensitive locations are controlled by the guided wave frequency. Thus, proper selection of the excitation frequency for guided wave testing enables defect detection in an intended area of an elbow with high sensitivity.
","null","null","2017-06","日本金属学会誌","Journal of the Japan Institute Metals","Vol.81","No.6","301","307","jpn","null","null","research_institution","null","null","10.2320/jinstmet.J2017002","0021-4876","null","https://ci.nii.ac.jp/naid/130005678929/","null","null","null" "ねじりモードガイド波によるエルボ通過後の欠陥反射シミュレーション","Simulation of the torsional mode guided wave reflection beyond elbow","古川 敬, 西野 秀郎","Takashi Furukawa, Hideo Nishino","null","null","null","null","null","2012","溶接・非破壊検査技術センター技術レビュー","溶接・非破壊検査技術センター技術レビュー","Vol.8","null","9","14","jpn","null","null","research_institution","null","null","null","null","null","http://ci.nii.ac.jp/naid/40019471565/","null","null","null" "ガイド波探傷の大規模FEMシミュレーション解析","Large scale FEM simulation of ultrasonic guided wave inspection","古川 敬, 古村 一朗, 西野 秀郎","Takashi Furukawa, Ichiro Komura, Hideo Nishino","null","null","null","null","null","2010","溶接・非破壊検査技術センター技術レビュー","溶接・非破壊検査技術センター技術レビュー","Vol.6","null","5","12","jpn","null","null","research_institution","null","null","null","null","null","http://ci.nii.ac.jp/naid/40017387365/","null","null","null" "Simple method of generating for circumferential shear horizontal waves in a pipe and their mode identifications","Simple method of generating for circumferential shear horizontal waves in a pipe and their mode identifications","Hideo Nishino, Kenichi Yoshida","Hideo Nishino, Kenichi Yoshida","null","null","null","null","null","2006-11","Acoustical Science and Technology","Acoustical Science and Technology","Vol.27","No.6","389","392","eng","null","null","scientific_journal","null","null","10.1250/ast.27.389","1346-3969","null","http://ci.nii.ac.jp/naid/110004836515/","null","null","null" "Estimating the diameter/thickness of a pipe using the primary wave velocity of a hollow cylindrical guided wave","Estimating the diameter/thickness of a pipe using the primary wave velocity of a hollow cylindrical guided wave","Hideo Nishino, Takemoto Mikio, Chubachi Noriyoshi","Hideo Nishino, Takemoto Mikio, Chubachi Noriyoshi","null","パイプを伝搬するガイド波において,最低次軸対象モードのL(0,1)と最低次非軸対象モードのF(1,1)モードでは,パイプの肉厚外径比による最大群速度が異なることを理論的に初めて言及し,その理論を展開した.本方法は,第一到達波のみが計測に関与するために,非常にローバストな計測が可能である.簡便なセンサーを用いて実験的に検証を行い,示した理論が正しいことを証明した.","パイプを伝搬するガイド波において,最低次軸対象モードのL(0,1)と最低次非軸対象モードのF(1,1)モードでは,パイプの肉厚外径比による最大群速度が異なることを理論的に初めて言及し,その理論を展開した.本方法は,第一到達波のみが計測に関与するために,非常にローバストな計測が可能である.簡便なセンサーを用いて実験的に検証を行い,示した理論が正しいことを証明した.","null","null","2004-08","Applied Physics Letters","Applied Physics Letters","Vol.85","No.6","1077","1079","eng","null","null","scientific_journal","null","null","10.1063/1.1781353","0003-6951","null","http://ci.nii.ac.jp/naid/80016822292/","null","null","null" "Analysis and Correction of Diffraction Effect on the B/A Measurement at High Frequencies","Analysis and Correction of Diffraction Effect on the B/A Measurement at High Frequencies","Dong Zhang, Xiu-Fen Gong, Xiao-Zhou Liu, Junichi Kushibiki, Hideo Nishino","Dong Zhang, Xiu-Fen Gong, Xiao-Zhou Liu, Junichi Kushibiki, Hideo Nishino","null","null","null","null","null","2004-01","Chinese Physics Letters","Chinese Physics Letters","Vol.21","No.1","107","109","eng","null","null","scientific_journal","null","null","10.1088/0256-307X/21/1/033","0256-307X","null","null","null","null","null" "Feasibility study of grain size estimation of S45C by attenuation measurement of 40MHz SAW genetrated by phase velocity scanning of laser interfeence fringes","Feasibility study of grain size estimation of S45C by attenuation measurement of 40MHz SAW genetrated by phase velocity scanning of laser interfeence fringes","Hideo Nishino, Furukawa Tutomu, Takashina Sunao, Takemoto Mikio","Hideo Nishino, Furukawa Tutomu, Takashina Sunao, Takemoto Mikio","null","S45Cの焼き戻しによる組織変化と40MHz弾性表面波の減衰との相関に関して示した.弾性表面波は走査干渉縞方式の位相速度走査法で励起し,非接触であるため高温中でも計測が可能である.実験では,30分,60分,90分間750degで焼き戻しした焼き入れ鋼を用意して行った.結果,30分,60分,90分間と時間が増えるに従って,フェライトとパーライト組織が増えていき,それに伴って超音波の減衰が29.2dB/cm,36.6dB/m,43.2dB/mと対数軸上で線形に増加していることが確認出来た.高周波40MHzを用いることで明確に差異を示すことが出来た.","S45Cの焼き戻しによる組織変化と40MHz弾性表面波の減衰との相関に関して示した.弾性表面波は走査干渉縞方式の位相速度走査法で励起し,非接触であるため高温中でも計測が可能である.実験では,30分,60分,90分間750degで焼き戻しした焼き入れ鋼を用意して行った.結果,30分,60分,90分間と時間が増えるに従って,フェライトとパーライト組織が増えていき,それに伴って超音波の減衰が29.2dB/cm,36.6dB/m,43.2dB/mと対数軸上で線形に増加していることが確認出来た.高周波40MHzを用いることで明確に差異を示すことが出来た.","null","null","2000","Japanese Journal of Applied Physics","Japanese Journal of Applied Physics","Vol.39","No.5B","3154","3155","eng","null","null","scientific_journal","null","null","null","0021-4922","null","null","null","null","null" "Excitation of high freqency surface acoustic waves by phase velocity scanning of a laser interference fringe","Excitation of high freqency surface acoustic waves by phase velocity scanning of a laser interference fringe","Hideo Nishino, Yusuke Tsukahara, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","Hideo Nishino, Yusuke Tsukahara, Yoshihiko Nagata, Toshio Koda, Kazushi Yamanaka","null","レーザーを固体試料表面に照射することで熱弾性効果による100MHz帯の弾性表面波の高効率励起について述べた.効率的な励起のために周波数の異なる2本のレーザービームを固体試料表面上で交差干渉させることで発生する走査干渉縞を用いている.この干渉縞の波数は2本のレーザービームの入射角に依存し,制御が可能である.また,周波数は2本のレーザービームの周波数差で示される.上記の走査干渉縞を用いることで110MHzの弾性表面波を高効率で励起出来たので報告する.この走査干渉縞の走査速度をレイリー波の位相速度に一致させることで,効率的なレイリー波の励起に成功している.","レーザーを固体試料表面に照射することで熱弾性効果による100MHz帯の弾性表面波の高効率励起について述べた.効率的な励起のために周波数の異なる2本のレーザービームを固体試料表面上で交差干渉させることで発生する走査干渉縞を用いている.この干渉縞の波数は2本のレーザービームの入射角に依存し,制御が可能である.また,周波数は2本のレーザービームの周波数差で示される.上記の走査干渉縞を用いることで110MHzの弾性表面波を高効率で励起出来たので報告する.この走査干渉縞の走査速度をレイリー波の位相速度に一致させることで,効率的なレイリー波の励起に成功している.","null","null","1993","Applied Physics Letters","Applied Physics Letters","Vol.62","No.17","2036","2038","eng","null","null","scientific_journal","null","null","null","0003-6951","null","null","null","null","null"