Accession Number : ADA311589

Title :   Acoustic Scattering from Compact Bubble Clouds.

Descriptive Note : Final rept.,

Corporate Author : WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s) : Roy, Ronald A. ; Schindall, Jeffrey A.

PDF Url : ADA311589

Report Date : JUN 1996

Pagination or Media Count : 282

Abstract : In this study, a simple model describing the low frequency scattering properties of high void fraction bubble clouds in both the free field and near the ocean surface is developed. This model, which is based on an effective medium approximation and acoustically compact scatterers, successfully predicts the results of the bubble cloud scattering experiment carried out at Lake Seneca NY for frequencies consistent with the model assumptions (Roy et al., 1992). The introduction of the surface is facilitated by the method of images is subject to the same constraint of low acoustic frequency imposed by the compact scatterer assumption. This model is not intended to serve as an exact replicate of oceanic bubble cloud scattering. The model herein was kept simple by design, for only then can the complex physical behavior be expressed in analytical form. Simple, analytic theories facilitate the exploration of parameter space, and more importantly serve to illuminate the underlying physics.

Descriptors :   *BUBBLES, *ACOUSTIC SCATTERING, PARAMETERS, THEORY, RESONANCE SCATTERING, FREE FIELD, IMAGES, AMBIENT NOISE, AUDIO FREQUENCY, LOW FREQUENCIES.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE