MODELING OF ELECTROMAGNETIC BEAM PROPAGATION UNDER LOW VISIBILITY WEATHER CONDITIONS

Authors
  1. Zardecki, A.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Laval Univ, Quebec QUE (CAN) Laboratoire de Recherches en Optique et Laser
Abstract
A theoretical framework for the study of radiative transfer of energy in a laser beam by aerosols is formulated. This is done in the case where the small angle approximation breaks down and the theory has to be completed by a diffusion correction to the small angle approximation. It appears, from explicit numerical results that have been obtained, that the diffusion correction for fogs starts to be significant for scattering angles in the range of 8 - 10 degrees. In addition to the study of the steady state situation, a modeling of the propagation of a laser pulse is described. The formalism is based on a two-frequency mutual coherence function in a plane-wave limit. Two approximate solutions to the evolution equation as well as a numerical integration of this equation are carried out. Numerical results for input pulses of the width 20 nsec and 35 nsec are presented.
Report Number
DREV-CR-112 — Final Report
Date of publication
15 Oct 1979
Number of Pages
148
DSTKIM No
80-00483
CANDIS No
88186
Format(s):
Hardcopy;Originator's fiche received by DSIS

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