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5 April 2000 Wavelet and wavelet-packet analysis of Lamb wave signatures in laser ultrasonics
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Laser-based ultrasonic (LBU) measurement shows great promise for on-line monitoring of weld quality in tailor-welded blanks. Tailor-welded blanks are steel blanks made from plates of different thickness and/or properties butt-welded together; they are used in automobile manufacturing to provide body, frame, and closure panels. LBU uses a pulsed laser to generate the ultrasound and a continuous wave laser interferometer to detect the ultrasound at the point of interrogation to perform ultrasonic inspection. LBU enables in-process measurement since there is no sensor contact or near-contact with the workpiece. The authors are using laser-generated plate waves to propagate form one plate into the weld nugget as a means of detecting defects.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephen W. Kercel, Marvin B. Klein, and Bruno F. Pouet "Wavelet and wavelet-packet analysis of Lamb wave signatures in laser ultrasonics", Proc. SPIE 4056, Wavelet Applications VII, (5 April 2000);

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