
Accession Number : ADA133258
Title : Application of TwoDimensional DiscreteOrdinates Methods to Multiple Scattering of Laser Radiation.
Descriptive Note : Rept. for 6 Dec 8217 Feb 83,
Corporate Author : ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND ABERDEEN PROVING GROUND MD CHEMICAL SYSTEMS LAB
Personal Author(s) : Zardecki,A ; Gerstl,S A W ; Embury,J F
PDF Url : ADA133258
Report Date : Jun 1983
Pagination or Media Count : 30
Abstract : The discreteordinates finite element radiation transport code TWOTRAN is applied to describe the multiple scattering of a laser beam from a reflecting target. For a model scenario involving a 99% relative humidity rural aerosol, the authors compute the average intensity of the scattered radiation and correction factors to the LambertBeer law arising from multiple scattering. As their results indicate, twodimensional xy and rz geometry modeling can reliably describe a realistic threedimensional scenario. Specific results are presented for the two visual ranges of 1.52 and 0.76 km which show that for sufficiently high aerosol concentrations (e.g., equivalent to V=0.76 km) the target signature in a distant detector becomes dominated by multiply scattered radiation from interactions of the laser light with the aerosol environment. The merits of the scaling group and the delta M approximation for the transfer equation are also explored.
Descriptors : *Numerical methods and procedures, *Computations, *Fortran, *Radiative transfer, Target signatures, Algorithms, Laser beams, Two dimensional, Coding, Finite element analysis, Scenarios, Aerosols, Scattering, Equations, Grids(Coordinates)
Subject Categories : Theoretical Mathematics
Computer Programming and Software
Thermodynamics
Distribution Statement : APPROVED FOR PUBLIC RELEASE