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29 October 2007 Measurements of the relative intensity of ship exhaust gas as a function of distance to infrared sensors
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We present results from infrared imaging experiments, performed under hot and humid conditions at Chesapeake Bay, Maryland, USA in the summer of 2006. Specifically, the objective was to study the intensity of the exhaust gases from a ship at different distances. In particular there is an interest to quantify the intensity decrease of the plume with distance and correlate this with simulations of atmospheric transmission. For this purpose the ship ran a predetermined course making broad-side passes at predetermined distances from the shore-based IR camera as part of the course. The distances were 1.6, 2.4, 3.2, 4, 6, and 8 km. The cameras are sensitive in the 3 - 5 μm and 8 - 12 μm wavelength ranges. Digital recordings were made during the ship broad-side passes. It is challenging to identify gas cloud pixels against a background because the pixels are not necessarily clustered. We present a statistical method to identify the gas cloud pixels, calculate their average intensity, and determine the contrast between the gas pixels and the background pixels as a function of distance. The contrast versus distance data are then compared with simulations using standard atmospheric transmission software.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Arthur D. van Rheenen, Erik Brendhagen, Lars Trygve Heen, Eirik Blix Madsen, Helge Fonnum, Pål Steenfeldt-Foss, Kjell Wikan, and Bernt Almklov "Measurements of the relative intensity of ship exhaust gas as a function of distance to infrared sensors", Proc. SPIE 6747, Optics in Atmospheric Propagation and Adaptive Systems X, 674709 (29 October 2007);

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