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Proceedings Paper

Characterization of Lamb waves in absorbing plates
Author(s): Kritsakorn Luangvilai; Laurence J. Jacobs; Paul Wilcox; Michael J.S. Lowe; Jianmin Qu
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Paper Abstract

This research uses a combination of laser ultrasonics, signal processing and analytical modeling techniques to examine the propagation of transient Lamb waves in absorbing plates -- in particular an isotropic plate with a lossless fluid on one side. The motivation is to develop a non-contact, point source-receiver technique capable of measuring attenuation of Lamb waves in lossy situations in general. The theoretical model enables an understanding of loss mechanisms and enables prediction of attenuation. The laser ultrasonic techniques enable broadband, point source-receiver idealization. The proposed signal processing technique, the short-time Fourier transform, resolves a signal into the time-frequency domain and enables Lamb mode separation and calculation of energy distribution at specific frequency-velocity points on the dispersion curves. The experimental procedure uses a stress-free plate as a reference for system variation and other loss mechanisms. Then, a plate with fluid on one side is tested to validate the signal processing algorithm. There is satisfactory agreement between the attenuation measured and predicted in the frequency range of interest.

Paper Details

Date Published: 21 July 2004
PDF: 9 pages
Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); doi: 10.1117/12.542478
Show Author Affiliations
Kritsakorn Luangvilai, Georgia Institute of Technology (United States)
Laurence J. Jacobs, Georgia Institute of Technology (United States)
Paul Wilcox, Univ. of Bristol (United Kingdom)
Michael J.S. Lowe, Imperial College (United Kingdom)
Jianmin Qu, Georgia Institute of Technology (United States)


Published in SPIE Proceedings Vol. 5394:
Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III
Tribikram Kundu, Editor(s)

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