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Proceedings Paper

Detectivity of gas leakage based on electromagnetic radiation transfer
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Paper Abstract

Standoff detection of gas leakage is a fundamental need in petrochemical and power industries. The passive gas imaging system using thermal imager has been proven to be efficient to visualize leaking gas which is not visible to the naked eye. The detection probability of gas leakage is the basis for designing a gas imaging system. Supposing the performance parameters of the thermal imager are known, the detectivity based on electromagnetic radiation transfer model to image gas leakage is analyzed. This model takes into consideration a physical analysis of the gas plume spread in the atmosphere-the interaction processes between the gas and its surrounding environment, the temperature of the gas and the background, the background surface emissivity, and also gas concentration, etc. Under a certain environmental conditions, through calculating the radiation reaching to the detector from the camera's optical field of view, we obtain an entity "Gas Equivalent Blackbody Temperature Difference (GEBTD)" which is the radiation difference between the on-plume and off-plume regions. Comparing the GEBTD with the Noise Equivalent Temperature Difference (NETD) of the thermal imager, we can know whether the system can image the gas leakage. At last, an example of detecting CO2 gas by JADE MWIR thermal imager with a narrow band-pass filter is presented.

Paper Details

Date Published: 10 May 2011
PDF: 9 pages
Proc. SPIE 8013, Thermosense: Thermal Infrared Applications XXXIII, 80130D (10 May 2011); doi: 10.1117/12.886596
Show Author Affiliations
Yunting Long, Beijing Institute of Technology (China)
Lingxue Wang, Beijing Institute of Technology (China)
Jiakun Li, Beijing Institute of Technology (China)
Changxing Zhang, Beijing Institute of Technology (China)
Bei Zhang, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 8013:
Thermosense: Thermal Infrared Applications XXXIII
Morteza Safai; Jeff R. Brown, Editor(s)

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