Measurement of velocity distribution of Laser-generated Rayleigh wave on welded structure

Li-ming Dong; Chenyin Ni; Zhong-hua Shen; Xiao-wu Ni

doi:10.1117/12.885673

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31 December 2010 Measurement of velocity distribution of Laser-generated Rayleigh wave on welded structure

Li-ming Dong, Chenyin Ni, Zhong-hua Shen, Xiao-wu Ni

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Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 754451 (2010) https://doi.org/10.1117/12.885673
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

Abstract

A new method based on laser-generated ultrasound and piezoelectric transducer (PZT) is proposed to measure the velocity distribution on welded metal structure. High-frequency Rayleigh waves are excited by the Nd: YAG pulsed laser and probed by self-made transducer. A serial of ultrasonic pulses can be detected on the surface of the sample by the transducer through the scan of the line source with translation stage. The waveform cross-correlation technique is applied to compute the propagation velocity of Rayleigh waves. Then analogically, a series of wave velocities at different positions are detected, by which the distribution of velocities is obtained. It is found that high frequency wave signals excited by laser line pulse can be probed effectively using the PZT, and results indicate that this method can provide the basis for precision detection with quick scanning and the reliable measurement of velocity distribution.

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Li-ming Dong, Chenyin Ni, Zhong-hua Shen, and Xiao-wu Ni "Measurement of velocity distribution of Laser-generated Rayleigh wave on welded structure", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754451 (31 December 2010); https://doi.org/10.1117/12.885673

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