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Proceedings Paper

Measurements of IR propagation in the marine boundary layer in warm and humid atmospheric conditions
Author(s): Lars Trygve Heen; Eirik Blix Madsen; Pål Steenfeldt-Foss; Kjell Wikan; Helge Fonnum; Arthur Dirk van Rheenen; Erik Brendhagen; Bernt Almklov
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Paper Abstract

A multinational field trial (SAPPHIRE) was performed at the Chesapeake Bay, USA, during June 2006 to study infrared ship signature and atmospheric propagation effects close to the sea surface in a warm and humid environment. In this paper infrared camera recordings of both land and ship mounted sources are analyzed. The cameras were positioned about 4 m above mean sea level. Several meteorology stations - mounted on land, on a pier and on a buoy - were used to characterize the propagation environment, while sensor heights were logged continuously. Both sub- and superrefractive conditions were studied. Measurements are compared to results from earlier field trials performed in Norway during typical North-Atlantic atmospheric conditions (cool air with little water content), and differences between medium wave and long wave infrared are emphasized. The ship mounted source - a calibrated blackbody source - was used to study contrast intensity and intensity fluctuations as a function of distance. The distance to the apparent horizon is also determined. In addition, normalized variance of intensity for land based sources has been calculated for a number of cases and these values can easily be converted to refractive index structure constant C2n-values. Measurement results are compared to results from the IR Boundary Layer Effects Model (IRBLEM).

Paper Details

Date Published: 29 October 2007
PDF: 12 pages
Proc. SPIE 6747, Optics in Atmospheric Propagation and Adaptive Systems X, 674706 (29 October 2007); doi: 10.1117/12.737701
Show Author Affiliations
Lars Trygve Heen, Norwegian Defence Research Establishment (Norway)
Eirik Blix Madsen, Norwegian Defence Research Establishment (Norway)
Pål Steenfeldt-Foss, Norwegian Defence Research Establishment (Norway)
Kjell Wikan, Norwegian Defence Research Establishment (Norway)
Helge Fonnum, Norwegian Defence Research Establishment (Norway)
Arthur Dirk van Rheenen, Norwegian Defence Research Establishment (Norway)
Erik Brendhagen, Norwegian Defence Research Establishment (Norway)
Bernt Almklov, Norwegian Defence Research Establishment (Norway)

Published in SPIE Proceedings Vol. 6747:
Optics in Atmospheric Propagation and Adaptive Systems X
Karin Stein; Anton Kohnle; John D. Gonglewski, Editor(s)

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