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 (a) SIG+, (b) SIG–, and (c) SUM. All three plots are on the same scale and the color specified by the bar indicates the absolute wavelet coefficient.