Generation of narrowband Lamb waves based on the Michelson interference technique

doi:10.1088/1674-1056/27/5/054301

Abstract An optical method of generating narrowband Lamb waves is presented. It is carried out with a laser line array in a thermoelastic regime implemented by the Michelson interference technique, where the formed array element spacing can be flexibly and conveniently changed to achieve selective mode excitation. In order to simulate the displacement response generated by this array, its intensity distribution function is presented to build a theoretical analysis model and to derive the integral representation of the displacement response. The experimental device and measuring system are built to generate and detect the Lamb waves on a steel plate. Numerical calculation results of narrowband Lamb wave displacement signals based on the theoretical model show good agreement with experimental results.

Keywords: narrowband Lamb wave selective generation laser array laser ultrasonics

Received: 07 January 2018
Revised: 08 March 2018
Accepted manuscript online:

PACS:	43.20.-f	(General linear acoustics)
	43.35.-c	(Ultrasonics, quantum acoustics, and physical effects of sound)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.11374230 and 11774264).

Corresponding Authors: Wen-Xiang Hu
E-mail: wxhu@tongji.edu.cn

Cite this article:

Tian-Ming Ye(叶天明), Yan-Feng Xu(徐琰锋), Wen-Xiang Hu(胡文祥) Generation of narrowband Lamb waves based on the Michelson interference technique 2018 Chin. Phys. B 27 054301

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