Characterization of lamb waves in absorbing plates

K. Luangvilai, L. J. Jacobs, Paul Wilcox, Michael J.S. Lowe, Jianmin Qu

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

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.

Original languageEnglish
Pages (from-to)33-41
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5394
DOIs
StatePublished - 2004
EventHealth Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III - San Diego, CA, United States
Duration: 15 Mar 200417 Mar 2004

Keywords

  • Lamb wave attenuation
  • Laser ultrasonics
  • Time-frequency representation

Fingerprint

Dive into the research topics of 'Characterization of lamb waves in absorbing plates'. Together they form a unique fingerprint.

Cite this