Effects of aerosol forward-scatter of infrared and visible light on atmospheric coherence diameter: theory and validation

Dan Sadot; Norman S. Kopeika

doi:10.1117/12.151007

13 August 1993 Effects of aerosol forward-scatter of infrared and visible light on atmospheric coherence diameter: theory and validation

Dan Sadot, Norman S. Kopeika

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Proceedings Volume 1971, 8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing; (1993) https://doi.org/10.1117/12.151007
Event: 8th Meeting in Israel on Optical Engineering, 1992, Tel Aviv, Israel

Abstract

A correction to the definition of the atmospheric coherence diameter is suggested here. The basis of this new approach is the existence of an aerosol MTF which is often the dominant ingredient of the atmospheric MTF. As defined by Fried about 25 years ago, atmospheric MTF was related to turbulence MTF only. In the case of a Gaussian approximation of the aerosol MTF, an analytical expression is derived for the aerosol-derived coherence diameter. This parameter is related to the aerosol MTF's cutoff frequency, and to its asymptote at high spatial frequencies. Qualitative validation of the theory is presented, based on measured MTFs in the open atmosphere. Overall atmospheric coherence diameter is generally the smaller between the turbulence and aerosol coherence diameters. The results here appear applicable particularly to cost-effective thermal imaging system design, although applications are considered too for the visible and near infrared.

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Dan Sadot and Norman S. Kopeika "Effects of aerosol forward-scatter of infrared and visible light on atmospheric coherence diameter: theory and validation", Proc. SPIE 1971, 8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing, (13 August 1993); https://doi.org/10.1117/12.151007

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KEYWORDS

Modulation transfer functions

Atmospheric particles

Aerosols

Turbulence

Spatial frequencies

Atmospheric optics

Thermography

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