Numéro
J. Phys. IV France
Volume 02, Numéro C1, Avril 1992
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics
Page(s) C1-637 - C1-640
DOI http://dx.doi.org/10.1051/jp4:19921137
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics

J. Phys. IV France 02 (1992) C1-637-C1-640

DOI: 10.1051/jp4:19921137

APPLICATION DE L'ANALYSE EN ONDELETTES À LA DÉTECTION DE FISSURES PAR ÉCHOGRAPHIE ULTRASONORE

J.P. LEFEBVRE and P. LASAYGUES

Laboratoire de Mécanique et d'Acoustique, 31 Ch. Joseph-Aiguier, F-13402 Marseille cedex 9, France


Abstract
This paper is related to the problem of echographic detection of cracks under coatings. It is concerned with both modelization and signal processing. For the modelization of scattering, we have chosen monoscattering approximations (Born for interfaces in material, Physical Optics for cracks) that appear to be very efficient for the problem. As a tool for signal processing, we have chosen a time-scale method, the wavelet analysis, that appears to be very well suited for signal discrimination.



© EDP Sciences 1992