Measurements of IR propagation in the marine boundary layer in warm and humid atmospheric conditions

Lars Trygve Heen; Eirik Blix Madsen; Pål Steenfeldt-Foss; Kjell Wikan; Helge Fonnum; Arthur Dirk van Rheenen; Erik Brendhagen; Bernt Almklov

doi:10.1117/12.737701

29 October 2007 Measurements of IR propagation in the marine boundary layer in warm and humid atmospheric conditions

Lars Trygve Heen, Eirik Blix Madsen, Pål Steenfeldt-Foss, Kjell Wikan, Helge Fonnum, Arthur Dirk van Rheenen, Erik Brendhagen, Bernt Almklov

Author Affiliations +

Proceedings Volume 6747, Optics in Atmospheric Propagation and Adaptive Systems X; 674706 (2007) https://doi.org/10.1117/12.737701
Event: SPIE Remote Sensing, 2007, Florence, Italy

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 C²_n-values. Measurement results are compared to results from the IR Boundary Layer Effects Model (IRBLEM).

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Lars Trygve Heen, Eirik Blix Madsen, Pål Steenfeldt-Foss, Kjell Wikan, Helge Fonnum, Arthur Dirk van Rheenen, Erik Brendhagen, and Bernt Almklov "Measurements of IR propagation in the marine boundary layer in warm and humid atmospheric conditions", Proc. SPIE 6747, Optics in Atmospheric Propagation and Adaptive Systems X, 674706 (29 October 2007); https://doi.org/10.1117/12.737701

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