Accession Number : ADA191068
Title : Multiple Scattering of Waves in Discrete Random Media.
Descriptive Note : Final rept. 1 Nov 84-14 Nov 87,
Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK LAB FOR ELECTROMAGNETIC AND ACOUSTIC RESEARCH
Personal Author(s) : Varadan, Vijay K ; Varadan, Vasundara V ; Ma, Yushieh
Report Date : 31 Dec 1987
Pagination or Media Count : 148
Abstract : Multiple scattering of waves in discrete random media was investigated particularly in the scattered intensities (coherent and incoherent). The formalism was applied to examine the effective properties, which are frequency dependent, of either structural composites or wave absorbing composite materials (electronic, elastic and acoustic). The pair correlation function for hard disks was obtained using Monte Carlo simulation and later was used to compute the effective propagation constants for fiber reinforced composites. Nonspherical statistics was employed to study scattering from densely distributed nonspherical scatterers in host medium. The coherent as well as incoherent intensities were computed for spheroidal scatterers and spherical scatterers with different polarizations. The backscattered intensities obtained from our formalism which parallels the diagram method first proposed by Feynman compare favorably with those from optical experiments. Keywords: Multiple scattering; Discrete random media; Nonspherical scatterers; Monte Carlo simulation; Backscattering enhancement; Rough surface scattering; Wave absorbing materials.
Descriptors : *INCOHERENT SCATTERING , *MECHANICAL WAVES , ABSORBERS(MATERIALS) , BACKSCATTERING , COMPOSITE MATERIALS , COMPOSITE STRUCTURES , CORRELATION , DIAGRAMS , DISKS , DISTRIBUTION , ELASTIC PROPERTIES , FIBER REINFORCED COMPOSITES , FUNCTIONS(MATHEMATICS) , INTENSITY , MONTE CARLO METHOD , OPTICAL PROPERTIES , OPTIMIZATION , PROPAGATION , SCATTERING , SIMULATION , SPHERES , STATISTICS , SURFACE ROUGHNESS , SURFACE ROUGHNESS
Subject Categories : Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE