Dispersive Acoustical Propagation in Stratified Structures

Author: Gazanhes C.   Sageloli J.   Kurkdji J.  

Publisher: S. Hirzel Verlag

ISSN: 1610-1928

Source: Acta Acustica united with Acustica, Vol.82, Iss.3, 1996-05, pp. : 442-449

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Abstract

In order to compare the theories of Brekhovskikh and Hegemier on wave propagation in stratified media, the velocity dispersion of an ultrasonic wave train was studied which propagates in a structure of layers of aluminium-epoxyde, in the frequency range 0.2–1.5 MHz. Two modes of propagation, a fast and a slow mode, predicted by the two theories of Brekhovskikh and Hegemier, were observed. The Brekhovskikh theory fits better to the experimental data than Hegemier's theory. The waveform of an ultrasonic wave train transmitted through the structure is computed by means of the stationary phase method for two modes. The computed signal is similar to the experimental signal.