Analysis on the influence of compact rectangular array parameters on laser-based Lamb wave imaging

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 87-93.

LIU Zenghua，MA Chunlei，CHEN Honglei，HE Cunfu，WU Bin

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Abstract

Laser ultrasonic technology has the advantages of non-contact and high inspection efficiency. It has been widely concerned in the field of nondestructive testing. In this paper, the characteristic of high spatial resolution of laser ultrasound technology is fully used. Defect detection in plate is carried out by the combination of compact rectangular array and laser-based Lamb wave technology. The continuous wavelet transform is used to process the wide-band Lamb wave signal with low time-domain resolution, which can obtain a narrow-band signal with high time-domain resolution at a given frequency. The linear mapping compensation technology is used to eliminate the dispersion in the narrow-band signal. Obtained signals after dispersion compensation are used for defect imaging. Finally, dispersion compensation signals are processed by combining with the amplitude imaging technique and the sign coherence factor imaging technique, and then defect imaging and location is achieved in the aluminum plate. Based on this, the effect of element spacing and number on beam steering and quality of defect imaging of compact rectangular array are analyzed. When the number of array elements is 16 and the array element spacing is one wavelength of Lamb wave mode, the width of the main lobe is narrow and there are no grating lobes, the defect imaging quality improved effectively.

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laser-based Lamb waves / compact rectangular array / continuous wavelet transform / dispersion compensation / sign coherence factor imaging

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LIU Zenghua，MA Chunlei，CHEN Honglei，HE Cunfu，WU Bin. Analysis on the influence of compact rectangular array parameters on laser-based Lamb wave imaging[J]. Journal of Vibration and Shock, 2020, 39(14): 87-93

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