Numéro
J. Phys. IV France
Volume 02, Numéro C1, Avril 1992
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics
Page(s) C1-629 - C1-632
DOI http://dx.doi.org/10.1051/jp4:19921135
Deuxième Congrès Français d'Acoustique / Second French Conference on Acoustics

J. Phys. IV France 02 (1992) C1-629-C1-632

DOI: 10.1051/jp4:19921135

INFLUENCE DES CONDITIONS DE COUPLAGE D'UN INTERFACE SUR LA FORME DU SIGNAL IMPULSIONNEL

Y. JAYET, J.C. BABOUX and M. PERDRIX

Laboratoire de Traitement du Signal et Ultrasons, INSA, Bât. 502, F-69621 Villeurbanne cedex, France


Abstract
Numerous theoretical studies have shown that the reflection and transmission phenomena of an ultrasonic plane wave can be expressed by complex coefficients depending on the acoustic properties of the different media and on the coupling conditions of the interface. In pulsed mode, the application of these complex coefficients changes the shape of the signal. Then, for a given incident shear wave, we study the influence of the quality of the interface, characterized by boundaries coefficients, on the shape of the reflected shear wave. So, we have proven that the quality of the interface cannot be determined only from the amplitude of the reflected signal but, we must consider its shape depending on the argument of reflection coefficient.



© EDP Sciences 1992