Accession Number : AD0672055

Title :   A MULTIPLE SCATTERING PROBLEM.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA INST OF TECH PASADENA ANTENNA LAB

Personal Author(s) : Varvatsis,A. D.

Report Date : MAY 1968

Pagination or Media Count : 147

Abstract : The report deals with the interaction of electromagnetic radiation with a statistical collection of nonmagnetic dielectric particles immersed in an infinite homogeneous isotropic nonmagnetic medium. The distance between any two particles is several wavelengths and the linear dimension of any particle is smaller, equal to, or greater than the wavelength. The particles are assumed to scatter line Rayleigh-Gans particles, i.e., interaction of the volume elements within a particle (self-interaction) is neglected. Multiple scattering is taken into account in the form of a series expansion of the scattered field. The terms of the series represent the multiple orders. Conditions are set up which guarantee that the multiple scattering contribution be more important than the self-interaction one. It is found that in the first order or single scattering the intensity pattern peaks in the forward direction. The multiple scattering tends to smooth out the intensity pattern. The polarization of the scattered wave is computed for the single and first order multiple scattering. If the medium is lossy the previous results do not alter, provided ((k sub ion)L) squared << 1 where k sub ion = imaginary part of the wave vector and L is the maximum linear dimension of the region occupied by the particles. In general the presence of the losses tends to reduce the forward scattering. (Author)

Descriptors :   (*ELECTROMAGNETIC RADIATION, SCATTERING), DIELECTRICS, POLARIZATION, GEOMETRIC FORMS, OPTICAL PROPERTIES, INTERACTIONS, THESES

Subject Categories : Optics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE