Wave-based acoustic shearography for defect imaging

Z. W Tham; Y. F. Chen; C. Y. Tan; L. Zhang

doi:10.1117/12.2657486

18 April 2023 Wave-based acoustic shearography for defect imaging

Z. W Tham, Y. F. Chen, C. Y. Tan, L. Zhang

Author Affiliations +

Proceedings Volume 12487, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII; 124870P (2023) https://doi.org/10.1117/12.2657486
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

Acoustic shearography technique is a wave-based shearography method. In acoustic shearography, acoustic or ultrasonic waves are used to provide stress loading in the testing materials. Due to the deep penetration of acoustic waves and the flexibility of wave focusing control, acoustic shearography technique can detect deep subsurface defects in solid materials at the optical imaging speed. In this paper, the working principles, and the system setup of the acoustic shearography system are to be presented. Various acoustic excitation methods including acoustic excitation with dispersive acoustic transducers, directional and focusing acoustic wave transducers and pulsed laser beams are discussed. The applications of acoustic shearography for imaging of defects in thick metal structures are demonstrated. The acoustic shearography technique provides a feasible and practical solution for fast NDT of thick and large area structures.

Conference Presentation

Citation Download Citation

Z. W Tham, Y. F. Chen, C. Y. Tan, and L. Zhang "Wave-based acoustic shearography for defect imaging", Proc. SPIE 12487, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII, 124870P (18 April 2023); https://doi.org/10.1117/12.2657486

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