Title: Experimental investigation of leaky Lamb modes by an optically induced grating
Authors: Van de Rostyne, K ×
Glorieux, Christ
Gao, WM
Lauriks, Walter
Thoen, Jan #
Issue Date: Sep-2002
Publisher: Ieee-inst electrical electronics engineers inc
Series Title: IEEE Transactions on ultrasonics ferroelectrics and frequency control vol:49 issue:9 pages:1245-1253
Abstract: By removing the symmetry of a free plate configuration, fluid loading significantly modifies the nature of acoustic waves travelling along a plate, and it even gives existence to new acoustic modes. We present theoretical predictions for the existence, dispersive behavior, and spatial distribution of leaky Lamb waves in a fluid-loaded film. Although Lamb modes are often investigated by studying the radiated fluid waves resulting from their leakage, here their properties are assessed by detecting the wave displacements directly using laser beam deflection. By using crossed laser beam excitation, the detection and analysis of the different modes is done at a fixed wavelength, allowing one to verify the existence, the velocity, and the damping of each predicted mode in a simple and unambiguous way. Our theoretical predictions for the nature of the modes in a water-loaded Plexiglas film, including parts of looping modes, are experimentally confirmed.
ISSN: 0885-3010
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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