Research in Acoustical Scattering, Diffraction Catastrophes, Optics of Bubbles, and Acoustical Phase Conjugation
Abstract
The research summarized concerns several aspects of propagation and scattering of acoustical and optical waves. The topics discussed fall under the following four categories: (A) A generalization of the geometrical theory of diffraction which describes surface-guided wave contributions to the scattering of sound from smooth elastic objects in water; the effect of curvature on Lamb wave velocities on thick shells; a product expansion of the S function for elastic spheres; (B) Acoustical and optical caustics and associated wavefields: unfolding axial caustics; observations of lips caustics in light backscattered from oblate drops; and observations of acoustical and optical transverse cusps produced by reflection; (C) Physicals optics of bubbles in water: observations of Brewster angle light scattering; observations of backscattering from rising bubbles; asymptotic series for critical angle scattering useful for determining bubble sizes; and (D) Acoustic phase conjugation and aspects of wavefront reversal via three-wave mixing in a layer of enhanced nonlinearity as caused, for example, by a layer of microbubbles in water; the present status of experiments on three-wave mixing; and the possibility of phase conjugation via reflection from curved vibrating surfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1988
- Accession Number
- ADA201451
Entities
People
- P. L. Marston
Organizations
- Washington State University