23 November 1999 Detection of chemical agents in the atmosphere by passive IR remote sensing
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Passive FTIR remote sensing is based on the spectral analysis of ambient IR radiation. If there are chemical agents in the field of five of the IR sensor, and if there is a temperature difference between the background and the chemical agent cloud, significant excursion will appear in the IR spectra. By calculation of the radiance and the brightness temperature the spectral analysis can be performed without prior background measurements. Numerous chemical compounds can be identified by their spectral fingerprints with an automated software. From laboratory measurements detection limits are determined in terms of concentration X path length X temperature difference. Field measurements of released ammonia are presented. The ammonia cloud was identified on-line from several observation points at 600 m, 1.5 km and 2.4 km. The analysis results clearly demonstrate that reliable IR remote sensing of hazardous chemical agents in the atmosphere is possible if a highly sensitive instrument, an optimized measurement technique and a sophisticated evaluation software are used.
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Andreas Beil, Andreas Beil, Rainer Baum, Rainer Baum, Tim J. Johnson, Tim J. Johnson, } "Detection of chemical agents in the atmosphere by passive IR remote sensing", Proc. SPIE 3856, Internal Standardization and Calibration Architectures for Chemical Sensors, (23 November 1999); doi: 10.1117/12.371307; https://doi.org/10.1117/12.371307

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