Location of micro-cracks in plates using time reversed nonlinear Lamb waves

Liu Yaoxin¹, He Aijun³, Liu Jiehui¹, Mao Yiwei¹, Liu Xiaozhou^{1, 2, †}

Continuous wavelet transform of signals received at (a) x = –50 mm, (b) x = 0 mm, and (c) x = 50 mm during the backward propagation of time-reversed SUM on an intact plate. All plots are on the same scale and the color specified by the bar indicates the absolute wavelet coefficient.