Experimental study on the propagation characteristics of laser-induced Lamb waves based on frequency-wavenumber analysis

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (22) : 70-78.

LIU Zenghua1,2 FENG Xuejian1,2 REN Jie1,2 WANG Shuangquan1,2 HE Cunfu1,2 WU Bin1,2

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Abstract

It is difficult to realize the quantitative detection of defects by using the time domain or frequency domain features of Lamb wave signals due to their dispersion and multi-mode characteristics. This paper proposes a method for analyzing the propagation characteristics of laser-induced Lamb waves in frequency-wavenumber domain. Based on a full-optical laser ultrasonic testing system, time-space wavefield signals were obtained by the pulse laser excitation in a fixed location and continuous laser acquisition with one-dimensional scanning, where the propagation characteristics of laser-induced Lamb wave signals and the regular pattern of the interaction between the laser-induced Lamb wave signal and the defect can be visually displayed. The two-dimensional Fourier transform was used to convert the wavefield signals from the time-space domain to the frequency-wavenumber domain where individual modes including in the signals are well discernible. Based on the idea of short-time Fourier transform, for retaining the space information, a short-space two-dimensional Fourier transform was adopted to obtain the distribution of wavenumber along the scanning path, by which the location of the defect can be visually displayed. The results of short-space two-dimensional Fourier transform were optimized by using band-pass filtering combined with continuous wavelet transform. The experiments performed on pristine and defected aluminum plates respectively confirm the effectiveness of the method.

Key words

laser-induced Lamb waves / frequency-wavenumber / continuous wavelet transform / two-dimensional Fourier transform / short-space two-dimensional Fourier transform

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LIU Zenghua1,2 FENG Xuejian1,2 REN Jie1,2 WANG Shuangquan1,2 HE Cunfu1,2 WU Bin1,2. Experimental study on the propagation characteristics of laser-induced Lamb waves based on frequency-wavenumber analysis[J]. Journal of Vibration and Shock, 2019, 38(22): 70-78

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