Time-reversal damage imaging based on laser ultrasonic guide waves with temporal filter method

Chenguang Xu; Baiqiang Xu; Ying Luo; Guidong Xu; Sai Zhang

doi:10.1117/12.2524424

29 March 2019 Time-reversal damage imaging based on laser ultrasonic guide waves with temporal filter method

Chenguang Xu, Baiqiang Xu, Ying Luo, Guidong Xu, Sai Zhang

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110460P (2019) https://doi.org/10.1117/12.2524424
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

Abstract

More attention has been drawn to ultrasonic guided waves (UGW) based damage detection method for its advantages of wide range inspection of large-scale structures. However, complex propagation characteristics of guided waves as well as traditional contact ultrasonic transducers limit its application for the practical damage detection. In this work, A fully noncontact laser ultrasonic detection system is designed by combining YAG pulsed laser with Scanning Laser Doppler Vibrometer (SLDV) to achieve high resolution sensing of UGW field in the structure. A Temporal filter method with multiple frequency bands is proposed to extract the scattering signal without reference signal. The f-k time reversal imaging method is introduced to obtain the reconstructed incident wavefield and scattered wavefield, while the cross-correlation imaging condition is used to identify the damage location in plate structures. Finally, the imaging results of different frequency bands are integrated to achieve accurate imaging with high-precision and high signal-to-noise ratio.

Citation Download Citation

Chenguang Xu, Baiqiang Xu, Ying Luo, Guidong Xu, and Sai Zhang "Time-reversal damage imaging based on laser ultrasonic guide waves with temporal filter method", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110460P (29 March 2019); https://doi.org/10.1117/12.2524424

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