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Open AccessLetter

Internal Cylinder Identification Based on Different Transmission of Longitudinal and Shear Ultrasonic Waves

by 1,†, 2,†, 2, 1,3, 1,3 and 1,3,*
1
Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China
2
Key Lab of In-Fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin 150001, China
3
Academy of Marine Information Technology, Guilin University of Electronic Technology, Beihai 536000, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Daria Wotzka and Luca De Marchi
Sensors 2021, 21(3), 723; https://doi.org/10.3390/s21030723
Received: 6 November 2020 / Revised: 6 January 2021 / Accepted: 20 January 2021 / Published: 21 January 2021
We have built a Fizeau fiber interferometer to investigate the internal cylindrical defects in an aluminum plate based on laser ultrasonic techniques. The ultrasound is excited in the plate by a Q-switched Nd:YAG laser. When the ultrasonic waves interact with the internal defects, the transmitted amplitudes of longitudinal and shear waves are different. The experimental results show that the difference in transmission amplitudes can be attributed to the high frequency damping of internal cylinders. When the scanning point is close to the internal defect, the longitudinal waves attenuate significantly in the whole defect area, and their amplitude is always smaller than that of shear waves. By comparing the transmitted amplitudes of longitudinal and shear waves at different scanning points, we can achieve a C scan image of the sample to realize the visual inspection of internal defects. Our system exhibits outstanding performance in detecting internal cylinders, which could be used not only in evaluating structure cracks but also in exploring ultrasonic transmission characteristics. View Full-Text
Keywords: elastic waves; laser ultrasound; Fizeau fiber interferometer; defect identification elastic waves; laser ultrasound; Fizeau fiber interferometer; defect identification
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MDPI and ACS Style

Liu, W.-B.; Yan, W.-B.; Liu, H.; Tong, C.-G.; Fan, Y.-X.; Tao, Z.-Y. Internal Cylinder Identification Based on Different Transmission of Longitudinal and Shear Ultrasonic Waves. Sensors 2021, 21, 723. https://doi.org/10.3390/s21030723

AMA Style

Liu W-B, Yan W-B, Liu H, Tong C-G, Fan Y-X, Tao Z-Y. Internal Cylinder Identification Based on Different Transmission of Longitudinal and Shear Ultrasonic Waves. Sensors. 2021; 21(3):723. https://doi.org/10.3390/s21030723

Chicago/Turabian Style

Liu, Wen-Bei; Yan, Wen-Bo; Liu, Huan; Tong, Cheng-Guo; Fan, Ya-Xian; Tao, Zhi-Yong. 2021. "Internal Cylinder Identification Based on Different Transmission of Longitudinal and Shear Ultrasonic Waves" Sensors 21, no. 3: 723. https://doi.org/10.3390/s21030723

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