Un modèle efficace pour prédire le champ transitoire rayonné dans un milieu élastique par les traducteurs ultrasonores

Abstract
A model is proposed for the transient radiation by an arbitrary loading in an elastic half-space. The assumptions and approximations made in the derivation are explicitely presented. Their consequences on model's accuracy are discussed. A radiation integral for elastic waves is derived and shown to be related to the Rayleigh integral for acoustic waves. As an example, analytic expression for the field radiated by a disc thickness-mode transducer is given, leading to a solution to displacement impulse-responses closely related to the well-known solution to transient acoustic radiation. Results predicted by the present model are compared with exact results. The accuracy is very satisfactory both qualitatively (shape of waveforms) and quantitatively (amplitude).