1 April 2010 Experimental research on damage detection of large thin aluminum plate based on Lamb wave
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Time reversal active sensing using Lamb waves is investigated for health monitoring of a metallic structure. Experiments were conducted on an aluminum plate to study the time reversal behavior of A0 and S0 Lamb wave modes under narrow band pulse excitation. Damage in the form of a notch was introduced in the plate to study the changes in the characteristics of the time reversed Lamb wave modes experimentally. Time-frequency analysis of the time reversed signal was carried out to extract the damage information. A measure of damage based on wavelet transform was derived to quantify the hidden damage information in the time reversed signal. This is demonstrated by picking up the reflection of waves from the edge of the plate, from a defect close to the edge of the plate and from defects located near to each other. This study shows the effectiveness of Lamb wave time reversal for temporal recompression of dispersive Lamb waves for damage detection in health monitoring applications.
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Naizhi Zhao, Naizhi Zhao, Shi Yan, Shi Yan, } "Experimental research on damage detection of large thin aluminum plate based on Lamb wave", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 76474E (1 April 2010); doi: 10.1117/12.847501; https://doi.org/10.1117/12.847501

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