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15 December 1998 Gas plume characterization by passive remote sensing: application to CO2
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The remote sensing of CO2 plumes or clouds is made possible by a passive optical method: we analyze the measured radiation to find the plume temperature and concentration which are supposed to be constant in the plume along the measuring optical path. The optical axis is issued from the background which is considered as air at room temperature; the radiation first goes across the CO2 cloud along an optical path a few meters long then across air volume between the detection apparatus and the CO2 cloud. We have to take into account the absorptivity of the atmosphere air and the emissivity of the background. Three measuring wavelengths are necessary: one gives us the background luminance, the two others are two CO2 absorption bands. The selection of these wavelengths requires a spectroscopic simulation of the CO2 and H2O molecules; consequently we have to model the spectroscopic product of the CO2 emissivity and air transmittance line by line. After identifying the measured luminances from a database we can find the temperature and then the concentration of the CO2 plume. We are also perfecting too a two wavelengths imaging system using an IR camera to visualize a CO2 plume over a very short period of time.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Philippe J.L. Herve, A. Riguet, P. Caron, and Olivier Jacquot "Gas plume characterization by passive remote sensing: application to CO2", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998);

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