Article
Air-coupled acoustic imaging with zero-group-velocity Lamb modes
Applied Physics Letters
Document Type
Article
Disciplines
Publication Date
9-29-2003
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%!.
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
Copyright Date
2003
Language
en
File Format
application/pdf
Citation Information
Stephen D. Holland and Dale E. Chimenti. "Air-coupled acoustic imaging with zero-group-velocity Lamb modes" Applied Physics Letters Vol. 83 Iss. 13 (2003) p. 2704 - 2706 Available at: http://works.bepress.com/stephen_holland/4/
This article appeared in Applied Physics Letters 83, no. 13 (2003): 2704–2706, doi:10.1063/1.1613046.