Investigations on the IR-range performance under different atmospheric conditions

Karin Stein

doi:10.1117/12.629572

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13 October 2005 Investigations on the IR-range performance under different atmospheric conditions

Karin Stein

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Proceedings Volume 5981, Optics in Atmospheric Propagation and Adaptive Systems VIII; 59810A (2005) https://doi.org/10.1117/12.629572
Event: SPIE Remote Sensing, 2005, Bruges, Belgium

Abstract

The propagation of IR radiation through the marine boundary layer is very much dependent on atmospheric conditions. Especially the vertical temperature gradient has a strong influence on the maximum detection ranges of an imaging system. Due to the Air-Sea Temperature Difference (ASTD) the distance to the visible horizon can be shorter (ASTD < 0°C) or larger (ASTD > 0°C) than the distance to the geometric horizon. Propagation models exist which predict maximum ranges for varying environmental conditions. FGAN-FOM conducted measurements in the mid and long wave IR (MWIR and LWIR) at different locations. Analysis was made on the signal of IR point sources on board a boat sailing towards the horizon. In this paper measured detection ranges and decreasing and increasing signals with range are compared to model predictions.

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Karin Stein "Investigations on the IR-range performance under different atmospheric conditions", Proc. SPIE 5981, Optics in Atmospheric Propagation and Adaptive Systems VIII, 59810A (13 October 2005); https://doi.org/10.1117/12.629572

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