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

Sensors

Stephen Walsh¹  Larry Chilton²  Mark Tardiff¹ 

[1] PO Box 999, Pacific Northwest National Laboratory, Richland, WA 99352 E-mail:

关键词: plumes;    signal;    emissivity;    clutter;    temperature;    LWIR;    hyperspectral;    Signal-to-Noise Ratio;   

DOI  :  10.3390/s8106471

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2008 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.