Laser-induced Scholte wave detection at air-solid interfaces by beam deflection technique

Zhao Yan; Zhonghua Shen; Jian Lu; Xiaowu Ni

doi:10.1117/1.2710174

Abstract

Based on beam deflection technique, an air-coupled laser acoustic detector was developed to investigate the Scholte waves excited thermoelastically by Nd:YAG laser pulse action on the air-solid interfaces. By experimental measurements, we obtained the waveforms of Scholte waves at the air-aluminum, air-copper, and air-steel interfaces. According to the waveforms detected at different positions, the velocity of Scholte waves was calculated, which is a little slower than sound velocity in air. The results are then compared with theoretical prediction and are well matched with each other. Moreover, the attenuations of Scholte waves were also measured while propagating along the three interfaces. The results show that the attenuations could be negligible. Last, the interactions of laser-induced Scholte waves and surface defect are also discussed.

Citation Download Citation

Zhao Yan, Zhao Yan, Zhonghua Shen, Zhonghua Shen, Jian Lu, Jian Lu, Xiaowu Ni, Xiaowu Ni, } "Laser-induced Scholte wave detection at air-solid interfaces by beam deflection technique," Optical Engineering 46(2), 024302 (1 February 2007). https://doi.org/10.1117/1.2710174 . Submission:

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