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Proceedings Paper

Effects of aerosol forward scatter on long and short exposure atmospheric coherence diameter
Author(s): Dan Sadot; Raviv Melamed; N. Dinur; Norman S. Kopeika
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Paper Abstract

Experimental investigation of atmospheric coherence diameter is presented in order to examine relative effects of turbulence and aerosol forward scattering. The investigation includes measurements through the open atmosphere for path lengths of several kilometers. In addition to turbulence degradation of atmospheric coherence diameter, it is shown here that aerosol forward scattering also causes severe limitations, particularly for short exposure. Two methods, direct (spatial domain) and indirect (spatial frequency domain), for measuring atmospheric coherence diameter are presented. The methods are theoretically and experimentally independent. Results of both methods are in very good agreement, emphasizing measurement reliability. It is shown that, in contradiction to turbulence, aerosols affect light coherence identically for both short and long exposures. Experimental results during rather extreme atmospheric conditions such as fog are presented too. The results here are applicable to cost-effective imaging system design, and to predicting imaging system performance through the atmosphere.

Paper Details

Date Published: 29 June 1994
PDF: 12 pages
Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994); doi: 10.1117/12.178018
Show Author Affiliations
Dan Sadot, Ben-Gurion Univ. of the Negev (Israel)
Raviv Melamed, Ben-Gurion Univ. of the Negev (Israel)
N. Dinur, Ben-Gurion Univ. of the Negev (Israel)
Norman S. Kopeika, Ben-Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 2222:
Atmospheric Propagation and Remote Sensing III
Walter A. Flood; Walter B. Miller, Editor(s)

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