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Proceedings Paper

Measurements of the relative intensity of ship exhaust gas as a function of distance to infrared sensors
Author(s): Arthur D. van Rheenen; Erik Brendhagen; Lars Trygve Heen; Eirik Blix Madsen; Helge Fonnum; Pål Steenfeldt-Foss; Kjell Wikan; Bernt Almklov
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Paper Abstract

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.

Paper Details

Date Published: 29 October 2007
PDF: 9 pages
Proc. SPIE 6747, Optics in Atmospheric Propagation and Adaptive Systems X, 674709 (29 October 2007); doi: 10.1117/12.737061
Show Author Affiliations
Arthur D. van Rheenen, Norwegian Defense Research Establishment (Norway)
Erik Brendhagen, Norwegian Defense Research Establishment (Norway)
Lars Trygve Heen, Norwegian Defense Research Establishment (Norway)
Eirik Blix Madsen, Norwegian Defense Research Establishment (Norway)
Helge Fonnum, Norwegian Defense Research Establishment (Norway)
Pål Steenfeldt-Foss, Norwegian Defense Research Establishment (Norway)
Kjell Wikan, Norwegian Defense Research Establishment (Norway)
Bernt Almklov, Norwegian Defense 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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