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Sensors 2008, 8(10), 6471-6483; doi:10.3390/s8106471

Effect of the Temperature-Emissivity Contrast on the Chemical Signal for Gas Plume Detection Using Thermal Image Data

Pacific Northwest National Laboratory, PO Box 999, Richland, WA 99352, USA
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Received: 4 September 2008 / Revised: 17 October 2008 / Accepted: 20 October 2008 / Published: 21 October 2008
(This article belongs to the Section Chemical Sensors)
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Abstract

Detecting and identifying weak gaseous plumes using thermal imaging data is complicated by many factors. These include variability due to atmosphere, ground and plume temperature, and background clutter. This paper presents an analysis of one formulation of the physics-based radiance model, which describes at-sensor observed radiance. The background emissivity and plume/ground temperatures are isolated, and their effects on chemical signal are described. This analysis shows that the plume’s physical state, emission or absorption, is directly dependent on the background emissivity and plume/ground temperatures. It then describes what conditions on the background emissivity and plume/ground temperatures have inhibiting or amplifying effects on the chemical signal. These claims are illustrated by analyzing synthetic hyperspectral imaging data with the adaptive matched filter using two chemicals and three distinct background emissivities. View Full-Text
Keywords: plumes; signal; emissivity; clutter; temperature; LWIR; hyperspectral; Signal-to- Clutter Ratio plumes; signal; emissivity; clutter; temperature; LWIR; hyperspectral; Signal-to- Clutter Ratio
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Walsh, S.; Chilton, L.; Tardiff, M.; Metoyer, C. Effect of the Temperature-Emissivity Contrast on the Chemical Signal for Gas Plume Detection Using Thermal Image Data. Sensors 2008, 8, 6471-6483.

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