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Proceedings Paper

Detection of chemical agents in the atmosphere by passive IR remote sensing
Author(s): Andreas Beil; Rainer Baum; Tim J. Johnson
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Paper Abstract

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.

Paper Details

Date Published: 23 November 1999
PDF: 13 pages
Proc. SPIE 3856, Internal Standardization and Calibration Architectures for Chemical Sensors, (23 November 1999); doi: 10.1117/12.371307
Show Author Affiliations
Andreas Beil, Bruker Saxonia Analytik GmbH (Germany)
Rainer Baum, Bruker Saxonia Analytik GmbH (Germany)
Tim J. Johnson, Bruker Optics (United States)

Published in SPIE Proceedings Vol. 3856:
Internal Standardization and Calibration Architectures for Chemical Sensors
Ronald E. Shaffer; Radislav A. Potyrailo, Editor(s)

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