Y. Ohara, M. C. Remillieux, T. J. Ulrich, S. Ozawa, K. Tsunoda, T. Tsuji, T. Mihara “Exploring 3D Elastic-Wave Scattering at Interfaces Using High-Resolution Phased-Array System” Scientific Reports, 12 (2022) 8291-1-11. https://doi.org/10.1038/s41598-022-12104-9 Press release
Y. Ohara, M. C. Remillieux, T. J. Ulrich, S. Ozawa, K. Tsunoda, T. Tsuji, T. Mihara “High-Resolution 3D Phased-Array Imaging of Fatigue Cracks Using Piezoelectric and Laser Ultrasonic System (PLUS)” Japanese Journal of Applied Physics, 61 (2022) SG1043-1-10. https://doi.org/10.35848/1347-4065/ac48cd
Y. Oyabu, Y. Ohara, T. Tsuji, T. Mihara “Dark-Field Ultrasonic Imaging Method Using Mode-Converted Longitudinal Evanescent Field” Japanese Journal of Applied Physics, 61 (2022) SG1042-1-7. https://doi.org/10.35848/1347-4065/ac4add
FY 2021
Y. Ohara, S. Haupert, S. Li “Ultrafast Phased-Array Imaging with Pump Excitation for Closed-Crack Imaging” Applied Physics Express, 14 (2021) 126505-1-5. https://doi.org/10.35848/1882-0786/ac3d1e
Y. Ohara, T. Oshiumi, X. Wu, T. Uchimoto, T. Takagi, T. Tsuji, T. Mihara “High-Selectivity Imaging of Environmental Closed Fatigue Crack Using Surface-Acoustic-Wave Phased Array (SAW PA)” Ultrasonics, 119 (2021) 106629-1-8. https://doi.org/10.1016/j.ultras.2021.106629 Press release
Y. Ohara, K. Kikuchi, T. Tsuji, T. Mihara “Development of Low-Frequency Phased Array for Imaging Defects in Concrete Structures” Sensors, 21 (2021) 7012-1-15. https://doi.org/10.3390/s21217012
Y. Ohara, T. Umezaki, E. Carcreff, S. Haupert, T. Tsuji, T. Mihara “Experimental Analysis of Linear and Nonlinear Ultrasonic Scatterings at Closed Fatigue Crack Using Fixed-Voltage Fundamental Wave Amplitude Difference with Radarlike Display” Japanese Journal of Applied Physics, 60, (2021) SDDB01-1-8. https://doi.org/10.35848/1347-4065/abe2e7
FY 2020
Y. Ohara, M. C. Remillieux, T. Onuma, K. Tsunoda, T. Tsuji, T. Mihara “Toward an Ultra-High Resolution Phased-Array System for 3D Ultrasonic Imaging of Solids” Applied Physics Letters, 117 (2020) 111902-1-5. https://doi.org/10.1063/5.0021282 press releaseTohoku University, School of Engineering
Y. Ohara, H. Nakajima, S. Haupert, T. Tsuji, T. Mihara “Imaging of Three-Dimensional Crack Open/Closed Distribution by Nonlinear Ultrasonic Phased Array Based on Fundamental Wave Amplitude Difference” Japanese Journal of Applied Physics, 59 (2020) SKKB01-1-9. https://doi.org/10.35848/1347-4065/ab79ea
FY 2019
M. Remillieux, D. Kaoumi, Y. Ohara, M. S. Geesey, L. Xi, R. Schoell, C. Bryan, D. Enos, D. Summa, T. J. Ulrich, B. Anderson, Z. Shayer “Detecting and Imaging Stress Corrosion Cracking in Stainless Steel, with Application to Inspecting Storage Canisters for Spent Nuclear Fuel” NDT&E International, 109 (2020) 102180-1-17. https://doi.org/10.1016/j.ndteint.2019.102180
Y. Ohara, H. Nakajima, T. Tsuji, T. Mihara “Nonlinear Nonlinear Surface-Acoustic-Wave Phased Array with Fixed-Voltage Fundamental Wave Amplitude Difference for Imaging Closed Cracks” NDT&E International, 108 (2019) 102170-1-10. https://doi.org/10.1016/j.ndteint.2019.102170
Y. Ohara, H. Nakajima, S. Haupert, T. Tsuji, T. Mihara “Nonlinear Ultrasonic Phased Array with Fixed-Voltage Fundamental Wave Amplitude Difference for High-Selectivity Imaging of Closed Cracks” The Journal of the Acoustical Society of America, 146-1 (2019) 266-277. https://doi.org/10.1121/1.5116017
Y. Ohara, J. Potter, H. Nakajima, T. Tsuji, T. Mihara “Multi-Mode Nonlinear Ultrasonic Phased Array for Imaging Closed Cracks” Japanese Journal of Applied Physics, 58 (2019) SGGB06-1-7. https://doi.org/10.7567/1347-4065/ab0adc
S. Haupert, Y. Ohara, E. Carcreff, G. Renaud “Fundamental Wave Amplitude Differene Imaging for Detection and Characterization of Embedded Cracks” Ultrasonics, 96 (2019) 132-139. https://doi.org/10.1016/j.ultras.2019.02.003
Review Articles
FY 2021
Y. Ohara “Recent Progress on Nonlinear Ultrasonic Phased Array of Utilizing Fundamental Waves (Japanese)” Journal of JSNDI, 70(9) (2021) 379-385.
T. Tsuji, H. Oshida, H. Kumagai, Y. Ohara, T. Mihara “Development of 1-3 Ceramic-Air Composite Transducer for Air-Coupled Ultrasonic Measurement (Japanese)” Ultrasonic Technology, 34(2)[3-4] (2022) 52-56.
FY 2020
Y. Ohara “Development of 3D Ultrasonic Imaging Method (PLUS) for Internal Defects (Japanese)” The Piping Engineering、63(3) (2021) 21-24.
Y. Ohara “Nonlinear Ultrasonic Phased Array Utilizing Fundamental Wave Amplitude Difference (Japanese)” Ultrasonic Technology, 32(4)[7-8] (2020) 29-35.
FY 2019
Y. Ohara “Imaging of Branched Stress Corrosion Cracking by Multi-Mode SPACE (Japanese)” Ultrasonic Technology, 31(6)[11-12] (2019) 87-91.
Books
[Editors] K.-Y. Jhang, C. Lissenden, I. Solodov, Y. Ohara, V. Gusev “Measurement of Nonlinear Ultrasonic Characteristics” (Springer, 2020) (Springer, Amazon)
[Chap. 5 (pp. 165-234)] Y. Ohara, T. Mihara, K. Yamanaka “Nonlinear Ultrasonic Phased Array for Measurement of Closed-Crack Depth” (Chap. 5 outlines not only the overall picture of a closed defect imaging method, “nonlinear ultrasonic phased array”, that has been remarkably developed in recent years, from its history to the latest technology, but also the fundamental principles, features, advantages and disadvantages of each method, how to use them differently, where they are applied, and even precautions for correct measurements.)
[Editor] T. Kundu “Nonlinear Ultrasonic and Vibro-Acoustical Techniques for Nondestructive Evaluation” (Springer, 2018) (Springer, e-book(Full), e-book(Chapt. 10))
[Chap. 10 (pp. 419-469)] Y. Ohara, T. Mihara, K. Yamanaka “Subharmonic phased array for crack evaluation (SPACE)” (Chapter 10 provides systematic coverage of one of the nonlinear ultrasonic phased arrays, “SPACE (subharmonic phased array for crack evaluation)”, including new data as well as contents published in previous papers.)
Awards & Honors
FY 2021
Y. Ohara The Incentive Award of Miyagi Foundation for the Promotion of Industrial Science “Development of Innovative 3D Ultrasonic Imaging Method”
Y. Oyabu (M2) Best Presentation Award (JSNDI Symposium in Tohoku Region) “Proposal of Shear-Wave-Excited Evanescent Super-Resolution Imaging Method for the Detection of Micro Defects and Its Fundamental Study”
Y. Nagatomo (B4) Excellent Presentation Award (Midterm Presentation of Undergraduate Dissertation) “Enhancement of Nonlinear Ultrasonic Imaging Method, SPACE, with a Laminated Transducer”
Y. Ohara [Certificate 1, Certificate2] The 17th Murakami Incentive Award of the Japan Institute of Metals and Materials “Development of Nonlinear Ultrasonic Phased Array for Accurate Measurement of Closed Cracks”
M. Ishibashi (M2) Dean’s Award of School of Engineering (Tohoku University)
S. Abe (M2) Young Scientist Award (The 40th Symposium on Ultrasonic Electronics (USE2019)) “Development of Laminated Lithium Niobate Transducer Available at 500℃”
FY 2019
Y. Ohara [Certificate, Photo1, Photo2, Photo3, Photo4] The 40th Honda Memorial Incentive Award (The Honda Memorial Foundation) “Development of Nonlinear Ultrasonic Phased Array for Accurate Measurement of Closed Cracks”
M. Ishibashi (M1) [Photo. Certificate] Best Presentation Award (JSNDI Fall Conference) “Fabrication of Laminated Transducer for Large-Amplitude SPACE and Its Application to Crack Imaging”
H. Oshida (M1) [Photo, Certificate] Best Presentation Award (JSNDI Fall Conference) “Characteristics of Transmission in Air by Exciting Gas-Composite Ultrasonic Probe with Burst Waves “
M. Ishibashi (M1) [Certificate] Best Presentation Award (JSNDI Symposium in Tohoku Region) “Fundamental Study on Laminated Transducer for Large-Amplitude SPACE”
International Conference Proceedings
FY 2021
Y. Ohara, M. C. Remillieux, T. J. Ulrich, S. Ozawa, K. Tsunoda, T. Tsuji, T. Mihara “3D Ultrasonic Phased-Array Imaging of Fatigue Cracks Using a Piezoelectric and Laser System (PLUS)” Proceedings of Symposium on Ultrasonic Electronics, 42 (2021) 2Pb2-6.
T. Tsuji, H. Fukushi, T. Oizumi, N. Takeda, T. Iwaya, S. Akao, Y. Tsukahara, K. Yamanaka, Y. Ohara, T. Mihara “Shortening Interval of Burst Waveform Undersampling Measurement of Ball SAW Sensor for Characterizing Metal Surface Morphology” Proceedings of Symposium on Ultrasonic Electronics, 42 (2021) 3J2-3.
Y. Oyabu, Y. Ohara, T. Tsuji, T. Mihara “Proposal of Shear-Wave-Excited Evanescent Super-Resolution Imaging Method for the Detection of Micro Defects and Its Fundamental Study” Proceedings of Symposium on Ultrasonic Electronics, 42 (2021) 1Pa2-7.
H. Kumagai, T. Tsuji, Y. Ohara, T. Mihara “Fundamental Study of 2-2 Ceramic-Air Composite Transducers for Air-Coupled Ultrasonic Measurement” Proceedings of Symposium on Ultrasonic Electronics, 42 (2021) 1Pb3-3.
FY 2020
Y. Ohara, T. Umezaki, E. Carcreff, S. Haupert, T. Tsuji, T. Mihara “Experimental Analysis of Linear and Nonlinear Ultrasonic Responses at Fatigue Cracks Using Fundamental Wave Amplitude Difference” Proceedings of Symposium on Ultrasonic Electronics, 41 (2020) 2Pa2-1-2
T. Umezaki, M. Ishibashi, T. Tsuji, Y. Ohara “Study on the Characteristics of Aluminum-Alloy Fatigue Cracks and the Behavior of Subharmonic Generation” Proceedings of Symposium on Ultrasonic Electronics, 41 (2020) 1Pb2-4-1-2.
M. Ishibashi, T. Umezaki, T. Tsuji, Y. Ohara, T. Mihara “Development of Large-Displacement Laminated Transducer and Its Application to SPACE” Proceedings of Symposium on Ultrasonic Electronics, 41 (2020) 1Pb2-5-1-2.
H. Ohshida, H. Kumagai, T. Tsuji, Y. Ohara, T. Mihara Development of 1-3 Ceramic-Air Composite Transduers for Air-Coupled Ultrasonic Measurement Proceedings of Symposium on Ultrasonic Electronics, 41 (2020) 3J3-2-1-2.
FY 2019
Y. Ohara, H. Nakajima, S. Haupert, T. Tsuji, T. Mihara “Imaging of Three-Dimensional Crack Open/Closed Distribution by Nonlinear Ultrasonic Phased Array Based on Fundamental Wave Amplitude Difference” Proceedings of Symposium on Ultrasonic Electronics, 40 (2019) 2P2-10-1-2.
S. Abe, T. Tsuji, Y. Ohara, T. Mihara “Development of Laminated Lithium Niobate Transducer Available at 500 °C” Proceedings of Symposium on Ultrasonic Electronics, 40 (2019) 1P2-2-1-2.
T. Suzuki, T. Tsuji, Y. Ohara, T. Mihara “Development of Couplant-Free Point-Contact Ultrasonic Probe for Concrete Measurement” Proceedings of Symposium on Ultrasonic Electronics, 40 (2019) 1P2-3-1-2.
E. Carcreff, D. Braconnier, Y. Ohara, S. Haupert, G. Renaud “Nonlinear Imaging of Closed Cracks by a Fundamental Wave Amplitude Difference Approach” Review of Progress in Quantitative Nondestructive Evaluation (QNDE2019), 46 (2019) 1234-1-3.
Presentations at International Conferences
FY 2021
Y. Ohara, M. C. Remillieux, T. J. Ulrich, S. Ozawa, K. Tsunoda, T. Tsuji, T. Mihara “3D Ultrasonic Phased-Array Imaging of Fatigue Cracks Using a Piezoelectric and Laser System (PLUS)” The 42nd Symposium on UltraSonic Electronics (USE2021), Online conference.
T. Tsuji, H. Fukushi, T. Oizumi, N. Takeda, T. Iwaya, S. Akao, Y. Tsukahara, K. Yamanaka, Y. Ohara, T. Mihara “Shortening Interval of Burst Waveform Undersampling Measurement of Ball SAW Sensor for Characterizing Metal Surface Morphology” The 42nd Symposium on UltraSonic Electronics (USE2021), Online conference.
Y. Oyabu, Y. Ohara, T. Tsuji, T. Mihara “Proposal of Shear-Wave-Excited Evanescent Super-Resolution Imaging Method for the Detection of Micro Defects and Its Fundamental Study” The 42nd Symposium on UltraSonic Electronics (USE2021), Online conference.
H. Kumagai, T. Tsuji, Y. Ohara, T. Mihara “Fundamental Study of 2-2 Ceramic-Air Composite Transducers for Air-Coupled Ultrasonic Measurement” The 42nd Symposium on UltraSonic Electronics (USE2021), Online conference.
FY 2020
Y. Ohara “Nonlinear Ultrasonic Phased Array for Imaging Closed Cracks” General Assembly of Academia NDT International (online) Invited
Y. Ohara, T. Umezaki, E. Carcreff, S. Haupert, T. Tsuji, T. Mihara “Experimental Analysis of Linear and Nonlinear Ultrasonic Responses at Fatigue Cracks Using Fundamental Wave Amplitude Difference” The 41st Symposium on UltraSonic Electronics (USE2020), Online conference.
M. Ishibashi, T. Umezaki, T. Tsuji, Y. Ohara, T. Mihara “Development of Large-Displacement Laminated Transducer and Its Application to SPACE” The 41st Symposium on UltraSonic Electronics (USE2020), Online conference.
T. Umezaki, M. Ishibashi, T. Tsuji, Y. Ohara “Study on the Characteritics of Aluminum-Alloy Fatigue Cracks and the Behavior of Subharonic Generation” The 41st Symposium on UltraSonic Electronics (USE2020), Online conference.
H. Ohshida, H. Kumagai, T. Tsuji, Y. Ohara, T. Mihara “Development of 1-3 Ceramic-Air Composite Transduers for Air-Coupled Ultrasonic Measurement” The 41st Symposium on UltraSonic Electronics (USE2020), Online conference.演
