Abstract

This research focuses on measuring the impact of truncations on the dispersion characteristics of wedge waves propagating along the wedge tip by using the laser-generated ultrasound. First, the finite element method was used to simulate laser-induced wedge waves and the dispersion curves were obtained by using the 2D Fourier transformation method. Pulsed laser excitation and laser-based wedge wave detection were also utilized to investigate these characteristics experimentally. For the 20° and 60° line wedges, both experimental and numerical results indicated that a nonideal wedge tip had great impact on the wedge waves. The modes of the 20° line wedge with truncations presented anomalous dispersion, low mode closed to high mode in high frequency, and the characteristics of antisymmetric Lamb waves as truncation increased. Meanwhile, the modes of the 60° line wedge with truncations showed the characteristics of antisymmetric Lamb waves, and the $A_1$ mode was also observed clearly. The findings of this study can be used to evaluate and detect wedge structure.

© 2015 Optical Society of America

Design of wedge structure with non-dispersive wedge wave propagation

Jing Jia, Zhonghua Shen, Qingbang Han, and Xueping Jiang
Appl. Opt. 56(30) 8564-8569 (2017)

Experimental and numerical studies for nondestructive evaluation of human enamel using laser ultrasonic technique

Kaihua Sun, Ling Yuan, Zhonghua Shen, Qingping Zhu, Jian Lu, and Xiaowu Ni
Appl. Opt. 52(28) 6896-6905 (2013)

Theoretical imaging study of early caries by a laser induced Rayleigh wave

Yuan Ling, Mei Song, Shen Zhonghua, Ni Xiaowu, and Lu Jian
Appl. Opt. 56(25) 7182-7187 (2017)

Laser radius measurement method based on the amplitude jump of a thermal wave

Dongjin Hu, Xunpeng Qin, Zeqi Hu, Yan Zeng, and Feilong Ji
Appl. Opt. 61(16) 4939-4946 (2022)

Noncontact depth-resolved micro-scale optical coherence elastography of the cornea

Shang Wang and Kirill V. Larin
Biomed. Opt. Express 5(11) 3807-3821 (2014)