Investigations on the IR-range performance under different atmospheric conditions

Karin Stein

doi:10.1117/12.629572

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

Karin Stein

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.

Citation Download Citation

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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