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Efficiency of Lamb modes in the spatial and frequency acoustic signatures for a thin layer by the resonance theory

Published online by Cambridge University Press:  15 May 2000

A. Ramdani ,
F. Augereau ,
M. Sidki  and
G. Despaux
A. Ramdani*
Affiliation:
Laboratoire des Sciences des Matériaux, Département de Physique, Faculté des Sciences, route Ben Maâchou, 24000 El Jadida, Morocco
F. Augereau
Affiliation:
Laboratoire d'Analyse des Interfaces et de Nanophysique (UPRESA 5011), Case courrier 82, Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex 5, France
M. Sidki
Affiliation:
Laboratoire des Sciences des Matériaux, Département de Physique, Faculté des Sciences, route Ben Maâchou, 24000 El Jadida, Morocco
G. Despaux
Affiliation:
Laboratoire d'Analyse des Interfaces et de Nanophysique (UPRESA 5011), Case courrier 82, Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex 5, France
*
[email protected]
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Abstract

To determine the mechanical properties of materials in thin layers by the measure of Lamb waves velocities, the acoustic microscopy can be used in two different manners: by the spatial acoustic signature V(z), and, less widespread, by the frequency acoustic signature V(f). However, in this study, we show that for each of these signatures V(z) or V(f), there are complementary domains of use in which the detection and the efficiency of Lamb modes are optimized. A specific formalism permits to foresee each of these domains where the efficiency is optimized.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 10 , Issue 2 , May 2000 , pp. 97 - 108
Copyright
© EDP Sciences, 2000

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