STUDY OF SPECKLE REDUCTION WHEN USING A CO2 WAVEGUIDE LASER CLOSE TO ITS THRESHOLD STATE

Authors
  1. Morin, M.
  2. Labranche, B.
  3. Bernard, P.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);National Optics Inst, Ste-Foy QUE (CAN)
Abstract
The Threat Detection Group at DRES is currently investigating the use of an active IR imaging system to detect and locate land mines. Such a system is composed essentially of a coherent light source illuminating a target area and a detection system which measures the amount of light reflected from different points of this area. The random phase scattering of the coherent probe beam by the rough target surface results in the production of a speckle field, presenting intensity variations that bear no relation to the reflectivity profile of the investigated area. This speckle noise limits the resolution achievable with active IR imaging systems. It can be reduced by lowering the coherence of the probe source. TRUNCATED
Report Number
DRES-CR-4-93 — Contract Report (Final)
Date of publication
15 Dec 1992
Number of Pages
41
DSTKIM No
93-00250
CANDIS No
127476
Format(s):
Hardcopy;Originator's fiche received by DSIS

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