Identification de la nature de milieux stratifiés à partir de l'écho renvoyé

Absorbing materials modelisation as received much recent attention including domains like: aero-acoustic (identification and classification of different materials,...) underwater acoustic (various types of sea beds, hydrobiology,...). We present in this paper two methods to estimating pertinent parameters from material reflections: - reflector response when a sinusoidal excitation is applied (narrow band). - impulse response of stratified environments (wide band)