Application of twodimensional discreteordinates methods to multiple scattering of laser radiation
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.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 June 1983
 Bibcode:
 1983STIN...8415539Z
 Keywords:

 Laser Outputs;
 Light Scattering;
 Mathematical Models;
 Radiative Transfer;
 Aerosols;
 Algorithms;
 Computation;
 Computer Programs;
 Coordinates;
 Finite Element Method;
 Fortran;
 Numerical Analysis;
 Radiation Transport;
 Signatures;
 Lasers and Masers