Accession Number : ADA192489
Title : The Covariance of Scalar Fields Scattered by Pressure-Release Randomly Rough Surfaces.
Descriptive Note : Master's thesis,
Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
Personal Author(s) : Restrepo, J M ; McDaniel, S T
PDF Url : ADA192489
Report Date : Dec 1987
Pagination or Media Count : 174
Abstract : Expressions for the spatial covariance of the scattered scalar field are presented. The scatterer is a randomly rough pressure-release surface with either Gaussian or Pierson-Stacy wavenumber spectrum. Three different models are presented: the Standard Model, which utilizes the Helmholtz-Kirchhoff integral as a starting point and uses an integration-by-parts technique to compute the random normal gradient; the Slope-Operator Model, developed using the Fresnel and Fraunhofer phase approximation, begins with a double-layer potential integral and relies on an operator to compute the dot product of the random normal gradient. Finally, the Composite-Roughness Model, which in essence merges perturbation techniques with the tangent plane formulations of the scattering integral is considered. Keywords: Acoustic fields, Acoustic scattering, Acoustic spectrum analysis, Acoustic wave coherence, Surface wave acoustic devices.
Descriptors : *ACOUSTIC FIELDS, *ACOUSTIC SCATTERING, *SURFACE ACOUSTIC WAVE DEVICES, ACOUSTIC EQUIPMENT, ACOUSTIC WAVES, COHERENCE, COVARIANCE, FORMULATIONS, GRADIENTS, LAYERS, MODELS, PERTURBATIONS, SCALAR FUNCTIONS, SPATIAL DISTRIBUTION, SURFACE ROUGHNESS, TANGENTS, SPECTRUM ANALYSIS
Subject Categories : Acoustics
Line, Surface and Bulk Acoustic Wave Devices
Distribution Statement : APPROVED FOR PUBLIC RELEASE