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Modelling of gradients in elastic properties for acoustic microscopycharacterizations

Published online by Cambridge University Press:  15 June 1999

H. Nounah ,
B. Cros  and
J. Attal
H. Nounah
Affiliation:
LIM, Faculté des Sciences, Université Ibnou Zohr, B.P. 28/S, Agadir, Morocco
B. Cros*
Affiliation:
LAIN, Université Montpellier II, 34095 Montpellier Cedex 05, France
J. Attal
Affiliation:
LAIN, Université Montpellier II, 34095 Montpellier Cedex 05, France
*
cros@lain.univ-montp2.fr
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Abstract

In order to allow non-destructive characterizations by acoustic microscopy, the materials presenting in their properties a gradient perpendicular to the surface are modelled. The method consists in regarding the material as built of a succession of homogeneous layers numerous enough for the acoustic parameters to vary quasi-continuously. The gradient in Young modulus existing in the material is related to a gradient in acoustic properties measurable by acoustic microscopy. The role of the shape of the gradient profile is taken into account in the study of the convergence of the velocity of the surface mode VS. The dispersion of the velocity VSversusd/λ (d is the depth of the gradient area and λ is the wavelength) is studied as a function of the gradient profile. The shape of the curves shows that the best sensitivity to the profile is obtained for d/λ≈1.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 6 , Issue 3 , June 1999 , pp. 237 - 242
Copyright
© EDP Sciences, 1999

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