Thermal imaging through the atmosphere: atmospheric MTF theory and verification

Dan Sadot; G. Kitron; N. Kitron; Norman S. Kopeika

doi:10.1117/12.154869

15 September 1993 Thermal imaging through the atmosphere: atmospheric MTF theory and verification

Dan Sadot, G. Kitron, N. Kitron, Norman S. Kopeika

Proceedings Volume 1968, Atmospheric Propagation and Remote Sensing II; (1993) https://doi.org/10.1117/12.154869
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

Both active and passive atmospheric modulation transfer function (MTF) measurements carried out simultaneously in both thermal imaging atmospheric windows are presented. Results indicate rather significant angular spatial frequency dependence of the MTF, in contradiction to the conventional approach which assumes contrast transfer is atmospheric transmission only. A theoretical explanation is discussed based upon aerosol forward scattering and absorption effects which are shown to be angular spatial frequency dependent and yield MTF results similar to those measured. This means that small targets are blurred much more than large targets by the atmosphere, thus also affecting target acquisition probabilities.

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Dan Sadot, G. Kitron, N. Kitron, and Norman S. Kopeika "Thermal imaging through the atmosphere: atmospheric MTF theory and verification", Proc. SPIE 1968, Atmospheric Propagation and Remote Sensing II, (15 September 1993); https://doi.org/10.1117/12.154869

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KEYWORDS

Modulation transfer functions

Atmospheric particles

Aerosols

Spatial frequencies

Thermography

Absorption

Light scattering

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