Accession Number : ADA293759

Title :   Further Investigation of the Scattering of Underwater Sound from a Porous Solid Sphere.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Pace, Martin E.

PDF Url : ADA293759

Report Date : DEC 1994

Pagination or Media Count : 53

Abstract : This investigation is an attempt to verify the results of a theoretical model, developed by Kargl and Lim, for the scattering of sound from a poro-elastic sphere embedded in a poro-elastic host. It is a follow-on to that conducted by LT. Theodore W. L. Muskey. Both monostatic and bistatic measurements were taken on two porous glass spheres composed of 100 and 500 micrometer glass beads and on an aluminum sphere. The Poisson's Ratio was calculated from the shear and Young's moduli measured from a cylindrical sample composed of 300 micrometers glass beads. This was used to calculate the bulk moduli for the porous spheres; the shear moduli had been previously measured by LT. Muskey. These and other material properties were used as input to the theoretical model developed by Kargl and Lim. The experimental data were compared to the theoretical values. Reasonably good agreement between the measured and predicted scattering was obtained for the aluminum and 100 micrometers spheres. The measured scattering from the 500 micrometers sphere was in poor agreement with the theoretical predictions. (AN)

Descriptors :   *ACOUSTIC SCATTERING, *POROUS MATERIALS, *UNDERWATER SOUND SIGNALS, SHEAR PROPERTIES, MATHEMATICAL MODELS, HIGH FREQUENCY, EXPERIMENTAL DATA, WATER, COMPARISON, MODULUS OF ELASTICITY, THESES, INPUT OUTPUT PROCESSING, GLASS, BACKSCATTERING, SPHERES, FORTRAN, MATHEMATICAL PREDICTION, ALUMINUM, SOUND TRANSMISSION, ACOUSTIC DATA, SOUND PRESSURE, SILICATES, POISSON RATIO, SOUND RANGING, ACOUSTIC RESONANCE.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE