Backscatter from a composite rough surface
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Authors
Decker, Wilson Banks
Subjects
Rough surface scattering
Acoustic backscatter
Wedge diffraction
Boundary wave
Acoustic backscatter
Wedge diffraction
Boundary wave
Advisors
Medwin, H.
Date of Issue
1980-12
Date
December 1980
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Backscatter of acoustic signals generated from surfaces having point scattering and line scattering features is studied experimentally in air. Signals are analyzed for propagation over three models: a smooth plane wedge, a wedge whose surface is slightly roughened with uniformly-packed lead shot, and one randomly roughened with gravel. Scattering from the rough surfaces at normal incidence is measured to estimate the statistical parameters that describe the surface roughness. The returned acoustic energy from the composite area of rough surface and wedge for low grazing angles is analyzed to determine whether the identity of the two individual backscatter effects can be separated in their combined spectrum. the near grazing backscattered amplitudes are much larger than predicted by conventional rough surface scattering theory and suggest the presence of a backscattered boundary wave.
Type
Thesis
Description
Series/Report No
Department
Department of Physics and Chemistry
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.