LAUE, URA 1373 of the CNRS, Univ. of Le Havre, 76610 Le Havre, France
Univ. of Le Havre, France
Catholic Univ., Washington, DC 20064
The fluid-borne interface wave on an evacuated cylindrical shell immersed in water is known as Scholte--Stoneley wave, or also as A wave [Talmant et al., J. Acoust. Soc. Am. 86, 278 (1989)]. The resonances of this wave, caused by phase matching upon its multiple circumnavigations of the scattering object, can be observed in the backscattering spectra of incident sound waves within a frequency window that depends on the shell thickness, for thicknesses less than 40% of the cylinder radius. The interaction between the flexural wave A[sub 0] in the shell, and the Scholte wave is studied in detail as a function of shell thickness. Dispersion curves for the A and the A[sub 0] waves are presented, indicating a region of repulsion between these two curves corresponding to a change of the physical nature of the two waves.