BLURRING EFFECT OF AEROSOLS ON IMAGING SYSTEMS (paper presented at the Fourth Propagation Engineering Conference, Orlando, Florida, 3 - 4 April 1991)

Authors
  1. Bissonnette, L.R.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
The main aerosol effect on imaging performance is brightness reduction through scattering losses. This is fairly well understood and modeled. However, one phenomenon that is almost always overlooked is the blurring of images that can result from forward-scattered radiation, i.e. the radiation reaching the image plane after being scattered by airborne particles. The paper describes a simple experiment to measure the visible point spread function, or the image of a point source, through fog and rain. The images were recorded with a CCD camera. Frame addition was used to reduce the statistical noise. Series of images were made with different neutral density filters and later recombined to increase the dynamic range beyond the 8-bit gray level range of the frame grabber. The results show the effects of range, particle density and particle size. The measurements are generally in good agreement with model predictions. TRUNCATED
Date of publication
15 Apr 1991
Number of Pages
13
Reprinted from
Proceedings of SPIE - The International Society for Optical Engineering, vol 1487, 1991, p 333-344
DSTKIM No
92-03442
CANDIS No
125880
Format(s):
Hardcopy;Originator's fiche received by DSIS

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