Effects of aerosol forward scatter on long and short exposure atmospheric coherence diameter

Dan Sadot; Raviv Melamed; N. Dinur; Norman S. Kopeika

doi:10.1117/12.178018

29 June 1994 Effects of aerosol forward scatter on long- and short- exposure atmospheric coherence diameter

Dan Sadot, Raviv Melamed, N. Dinur, Norman S. Kopeika

Proceedings Volume 2222, Atmospheric Propagation and Remote Sensing III; (1994) https://doi.org/10.1117/12.178018
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

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.

Citation Download Citation

Dan Sadot, Raviv Melamed, N. Dinur, and Norman S. Kopeika "Effects of aerosol forward scatter on long- and short- exposure atmospheric coherence diameter", Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994); https://doi.org/10.1117/12.178018

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