https://doi.org/10.1051/epjap:2000126
Efficiency of Lamb modes in the spatial and frequency acoustic signatures for a thin layer by the resonance theory
1
Laboratoire des Sciences des Matériaux, Département de Physique,
Faculté des Sciences, route Ben Maâchou, 24000 El Jadida, Morocco
2
Laboratoire d'Analyse des Interfaces et de Nanophysique (UPRESA 5011),
Case courrier 82, Université Montpellier II,
place Eugène Bataillon, 34095 Montpellier Cedex 5, France
Corresponding author: aramdani@hotmail.com
Received:
4
November
1999
Accepted:
2
February
2000
Published online: 15 May 2000
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.
PACS: 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 68.35.Gy – Mechanical and acoustical properties; adhesion
© EDP Sciences, 2000
