Determination and Use of IR Band Emissivities in a Multiple Scattering and Thermally Emitting Aerosol Medium

Abstract

We report on the application of a fast and efficient method for producing exact solutions of the thermal version of the radiative transfer equation, including effects of multiple scattering from both interior (thermal) sources and exterior (ambient) sources. The method is accurate to within four significant figures when compared with plane layer solutions published in the literature; this method has the added capability for treating discrete, localized aerosol clouds of spherical (and cylindrical) symmetry. The method, briefly summarized and applied in earlier papers, is described in detail here where we also demonstrate the utility of the method for calculating emissivity (and reflectivity) functions for finite aerosol clouds of arbitrary optical thickness and albedo. This report is focused on concepts and methods of the PILOT-EX model, which forms the theoretical basis for the more practical aerosol effects model PILOT81 designed for use in infrared scene generation and systems analysis.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2002
Accession Number
ADA404478

Entities

People

  • Robert A. Sutherland

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Computational Science
  • Emission
  • Emissivity
  • Equations
  • Geometry
  • Literature
  • Military Research
  • Obscurants
  • Radiation
  • Radiative Transfer
  • Reflectivity
  • Scattering
  • Scene Generation
  • Simulations
  • Symmetry
  • Systems Analysis
  • Thickness

Readers

  • Atmospheric Remote Sensing.
  • Calculus or Mathematical Analysis
  • Systems Analysis and Design