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Proceedings Paper

Demonstration of multispectral remote chemical sensing and identification using uncooled detectors
Author(s): Stephen Keith Holland; Roland H. Krauss; Gabriel Laufer
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Paper Abstract

Response and mitigation following a confirmed release of hazardous chemicals requires mapping of affected areas to determine evacuation and response procedures. In-situ sensors sample only locally while mapping requires remote sensors which can rapidly monitor large volumes from a distance. For use by first responders at all levels, sensors must be low-cost, simple, robust, battery operated, and relatively fast (< 1 s). A low-cost simple passive remote sensor based on multi-spectral infrared radiometry was demonstrated under laboratory conditions. The sensor consists of 8 uncooled pyroelectric infrared detectors with integrated bandpass filters selected to transmit radiation at bands that coincide with prominent spectral features of selected chemicals. Large radiative throughput achieved by detecting radiation through relatively broadband filters (20-30 cm-1) permitted the use of low-cost, uncooled detectors without a significant loss of system sensitivity relative to high-specificity remote sensors, which require cryogenic cooling. A new modulation and radiation distribution technique was developed to provide well registered imaging by the detectors and the amplitude modulation that is necessary for detection with pyroelectric detectors. Results show that uncooled sensors can provide sufficient sensitivity to simulants of toxic chemicals (methanol, DMMP, and DIMP) with spectral features in the 8-12 micron region. In addition, the detector array provides signatures of the tested chemical simulants sufficient for identification.

Paper Details

Date Published: 15 September 2004
PDF: 7 pages
Proc. SPIE 5403, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III, (15 September 2004); doi: 10.1117/12.541200
Show Author Affiliations
Stephen Keith Holland, Univ. of Virginia (United States)
Roland H. Krauss, Rammatek, LLC (United States)
Gabriel Laufer, Univ. of Virginia (United States)

Published in SPIE Proceedings Vol. 5403:
Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense III
Edward M. Carapezza, Editor(s)

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