Accession Number : ADA018162

Title :   A Unified Theoretical Description of Ultrasonic Beam Reflections from a Solid Plate in a Liquid.

Descriptive Note : Technical rept. 1 Oct-1 Dec 75,

Corporate Author : GEORGETOWN UNIV WASHINGTON D C DEPT OF PHYSICS

Personal Author(s) : Pitts,Leslie E.

Report Date : 01 DEC 1975

Pagination or Media Count : 106

Abstract : The study represents a theoretical analysis of reflectivities from a solid bounded by a liquid; specifically, it takes into account the dimensions of the solid as compared to the wavelength of the incident sonic signal. The result of the study is a unified theory which explains certain equivalencies between the Rayleigh mode of vibration (when the solid is infinitely thick) and the various Lamb modes (when the reflecting solid has finite dimensions, i.e., when the reflecting solid has a plate-like structure). A knowledge of the reflection coefficient for an ice water interface is of importance when a sonic event takes place in the water and sound energy reaches the ice.

Descriptors :   *Ultrasonic radiation, *Reflection, Solids, Plates, Ice, Analytic functions, Fourier transformation, Numerical analysis, Underwater sound, Sea ice, Sonar echoes, Interfaces

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE