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Proceedings Paper

Investigations on the IR-range performance under different atmospheric conditions
Author(s): Karin Stein
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Paper 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.

Paper Details

Date Published: 13 October 2005
PDF: 9 pages
Proc. SPIE 5981, Optics in Atmospheric Propagation and Adaptive Systems VIII, 59810A (13 October 2005); doi: 10.1117/12.629572
Show Author Affiliations
Karin Stein, FGAN-FOM (Germany)

Published in SPIE Proceedings Vol. 5981:
Optics in Atmospheric Propagation and Adaptive Systems VIII
Karin Stein; Anton Kohnle, Editor(s)

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