Document Type

Article

Publication Date

9-29-2003

Journal or Book Title

Applied Physics Letters

Volume

83

Issue

13

First Page

2704

Last Page

2706

DOI

10.1063/1.1613046

Abstract

A Lamb wave resonance has been found that allows unusually efficient transmission of airborne sound waves through plates. This occurs at the zero-group-velocity point at the frequency minimum of the first-order symmetric (S1 ) Lamb mode. At this frequency, plane waves with a range of incident angles can couple between the air and the Lamb mode in the solid plate, dominating the spectrum of transmitted focused sound beams by 10 dB or more. We use this frequency for C-scan imaging, and demonstrate the detection of both a 3.2-mm-diameter buried flaw and a subwavelength thickness changes of .005l ~1%!.

Comments

This article appeared in Applied Physics Letters 83, no. 13 (2003): 2704–2706, doi:10.1063/1.1613046.

Rights

Copyright 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Copyright Owner

American Institute of Physics

Language

en

File Format

application/pdf

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