An Investigation of Radiation Transfer through Aerosols.
ARMY MISSILE RESEARCH AND DEVELOPMENT COMMAND REDSTONE ARSENAL AL ADVANCED SYSTEMS CONCEPTS OFFICE
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Some aspects of the problem of radiative transfer through aerosols are investigated. The scattering of a plane wave of light of arbitrary wavelength by a cylindrically symmetric nonspherical particle of arbitrary size and refractive index is addressed. The Hertz vector formalism originally used by Mie to treat the spherical particle problem is extended to nonspherical particles. The electromagnetic boundary conditions are reduced to become a set of linear algebraic equations that are solved numerically. A computer code implementing the solution is developed and calculations for selected non spherical particles are presented. It is shown that the agreement between exact and approximate calculations for prolate spheroids is good. The multiple scattering of light by aerosols is also addressed through the Radiative Transfer equation. To consider more general problems associated with laser beam and image propagation, a solution of the two-dimensional Radiative Transfer equation is developed in the form of a numerical algorithm. A computer code implementing this algorithm is presented. Calculations are presented for both uniform and gaussian profile beams.
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