Accession Number : ADP006121

Title :   Multiple Scattering Effects of Ramdom Distributions of Irregularly Shaped Particles on Infrared and Optical Propagation,

Corporate Author : NEBRASKA UNIV LINCOLN DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Bahar, Ezekiel ; Fitzwater, Mary A.

Report Date : MAY 1987

Pagination or Media Count : 15

Abstract : Scattering and depolarization by layers of randomly distributed particles of irregular shape and finite conductivity are determined for infrared and optical electromagnetic excitations. The irregularly shaped particles considered here are spheres with random rough surfaces. They are characterized by their two dimensional surface height spectral density functions or autocorrelation functions. Circularly and linearly polarized excitations at normal incidence as well as vertically and horizontally polarized excitations at oblique incidence are considered. The co-polarized an cross-polarized incoherent diffuse specific intensities (Modified Stokes Parameter) are determined by solving the vector form of the equation of radiative transfer. To this end the full wave approach which accounts for diffuse scattering as well as specular scattering in a self-consistent manner is used to evaluate the extinction cross sections as well as the scattering (phase) matrix for the irregularly shaped particles. Both single-scatter and multiple-scatter incoherent specific intensities are evaluated for particles with smooth as well as rough surfaces. It is shown that the particle surface roughness can have a significant effect on the diffuse specific intensities. The phenomena of enhanced backscatter is also examined.

Descriptors :   *ELECTROMAGNETIC SCATTERING, *ELECTROMAGNETIC WAVE REFLECTIONS, RADIATIVE TRANSFER, DEPOLARIZATION, AUTOCORRELATION, INFRARED SPECTRA, VISIBLE SPECTRA, EXTINCTION, SYMPOSIA.

Subject Categories : Radiofrequency Wave Propagation
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE