Laser Generation of Lamb Waves for Defect Detection: Experimental Methods and Finite Element Modeling

被引：32

作者：

Burrows, Susan E. ^{[1
]}

Dutton, Ben

Dixon, Steve ^{[1
]}

机构：

[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2012年 / 59卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

DAMAGE DETECTION; CRACKS;

D O I：

10.1109/TUFFC.2012.2158

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The propagation of Lamb waves generated by a pulsed laser beam in an aluminum sheet is modeled using finite element analysis, and the interaction with defects is studied and compared to experimental results. The ultrasonic Lamb waves are detected by an electromagnetic acoustic transducer (EMAT). The frequency content of the received wave is shown to be enhanced when the generation point is situated directly over the defect in both the modeled and experimental cases. Time-frequency analysis using a Wigner transform has enabled individual modes to be identified.

引用

页码：82 / 89

页数：8

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