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Proceedings Paper

Remote measurement of highly toxic vapors by scanning imaging Fourier-transform spectrometry
Author(s): Roland Harig; Peter Rusch; Chris Dyer; Anita Jones; Richard Moseley; Benjamin Truscott
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Paper Abstract

In the case of chemical accidents, terrorist attacks, or war, hazardous compounds may be released into the atmosphere. Remote sensing by Fourier-transform infrared spectrometry allows identification and quantification of these hazardous clouds. The output of current standoff detection systems is a yes/no decision by an automatic identification algorithm that analyses the measured spectrum. The interpretation of the measured spectrum by the operator is complicated and thus this task requires an expert. Even if a scanning system is used for surveillance of a large area the operator is dependent on the decision of the algorithm. In contrast to that, imaging systems allow automatic identification but also simple interpretation of the result, the image of the cloud. Therefore, an imaging spectrometer, the scanning infrared gas imaging system (SIGIS) has been developed. The system is based on an interferometer with a single detector element (Bruker OPAG 22) in combination with a telescope and a synchronised scanning mirror. The results of the analyses of the spectra are displayed by an overlay of a false colour image, the "chemical cloud image", on a video image. In this work, the first application of the system as chemical warfare agent identification and imaging system is described. The system, the data analysis method, and results of measurements of chemical warfare agents are presented.

Paper Details

Date Published: 5 November 2005
PDF: 12 pages
Proc. SPIE 5995, Chemical and Biological Standoff Detection III, 599510 (5 November 2005); doi: 10.1117/12.631730
Show Author Affiliations
Roland Harig, Hamburg Univ. of Technology (Germany)
Peter Rusch, Hamburg Univ. of Technology (Germany)
Chris Dyer, Defence Science and Technology Lab. (United Kingdom)
Anita Jones, Defence Science and Technology Lab. (United Kingdom)
Richard Moseley, Defence Science and Technology Lab. (United Kingdom)
Benjamin Truscott, Defence Science and Technology Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 5995:
Chemical and Biological Standoff Detection III
James O. Jensen; Jean-Marc Thériault, Editor(s)

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