Document Type

Article

Publication Date

6-2004

Journal or Book Title

Journal of the Acoustical Society of America

Volume

115

Issue

6

First Page

2866

Last Page

2872

DOI

10.1121/1.1710501

Abstract

This paper presents and demonstrates a noncontact method for measuring the Lamb wave dispersion spectrum of a plate. Noncontact air-coupled source and receive transducers are used with line-focus mirrors and 50–700 kHz broadband apparatus for simultaneous measurement over a broad spectrum of refractive angles and multiple guided modes. Broadband, wide-angle wave forms are measured as a function of position. The Fourier transform of these wave forms from the t – x domain to the v – k domain gives an approximate spectrum of the dispersion relation. We measure the dispersion spectra of Lucite™, aluminum, balsa wood, and a carbon fiber epoxy laminate, and show that the measured spectra agree well with the dispersion relation calculated from Lamb wave theory.

Comments

This article was originally published in the Journal of the Acoustical Society of America 115, no. 6 (June 2004): 2866–2872, doi:10.1121/1.1710501.

Copyright Owner

Acoustical Society of America

Language

en

File Format

application/pdf

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