5pPA4. Scattering pole resonances: Relation to external and internal surface waves.

Session: Friday Afternoon, May 17

Time: 3:00

Author: H. Uberall
Location: Phys. Dept., Catholic Univ., Washington, DC 20064, LAUE, Univ. of Le Havre, 76610 Le Havre, France, and CNRS, Lab. Mecanique et Acoust., 13402 Marseilles, France
Author: J. Duclos
Author: M. El Hocine Khelil
Author: G. Maze
Author: J. Ripoche
Location: Univ. of Le Havre, 76610 Le Havre, France
Author: A. Gerard
Location: Univ. of Bordeaux, 33405 Talence, France
Author: X. L. Bao
Author: P. K. Raju
Location: Auburn Univ., Auburn, AL 36849
Author: J. P. Sessarego
Author: J. Sageloli
Location: CNRS, 13402 Marseilles, France


The resonance scattering theory and the singularity expansion method are based on the complex-frequency poles of the scattering amplitude; these are located off the real-frequency axis and lead to prominent resonances. Their physical origin lies in a phase matching of surface waves generated on the scattering object; hence a study of the resonances will lead to information on these surface waves. This will be demonstrated here for immersed elastic objects of plane, spherical, and cylindrical geometry where even the physical nature (fluidborne or elastic type) of the surface waves can be identified along portions of their dispersion curves, and where for multilayered structures individual-layer resonances can be distinguished, leading to solutions of the corresponding inverse problem.

from ASA 131st Meeting, Indianapolis, May 1996