Accession Number : AD0713068

Title :   AN EXPERIMENTAL MODEL STUDY OF UNDERWATER ACOUSTIC SCATTERING FROM A WIND-DRIVEN SURFACE.

Descriptive Note : Doctoral thesis,

Corporate Author : NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB

Personal Author(s) : Kingsbury,F. John

Report Date : 13 AUG 1970

Pagination or Media Count : 371

Abstract : The results of an experimental investigation into the characteristics of acoustic energy reflected from rough, time-varying surfaces are presented. Theory pertinent to the study of acoustic scattering is also presented to form a predictive base for the experimental work. The experimentally derived amplitude, slope, spectral, and spatial correlation characteristics of the rough surfaces are presented. Measurement results are shown which describe the spatial distribution characteristics of energy scattered from the rough surfaces. Experiments performed to determine the modulation effects imposed on the reflected acoustic energy by the time-varying surfaces are also presented. For all the measurements, the effects on the scattered energy characteristics of shadowing and changes in acoustic frequency, grazing angle, and the direction of acoustic propagation relative to the wave motion are discussed. (Author)

Descriptors :   (*UNDERWATER SOUND, SCATTERING), (*SONAR SIGNALS, SCATTERING), WIND, SURFACES, PHASE MODULATION, MATHEMATICAL PREDICTION, SOUND TRANSMISSION, UNDERWATER SOUND SIGNALS, REFLECTION, DOPPLER EFFECT, WIND TUNNELS, BACKSCATTERING, THESES

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE