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Proceedings Paper

Detecting unknown chemical clouds at distance with multispectral imagery
Author(s): Sylvain Favier; Aymeric Alazarine; Manon Verneau; Romain Verollet; Sébastien Blanchard
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Paper Abstract

In the past, chemical incidents or attacks have often involved mixtures of chemicals or fractional formulations of toxic compounds. Terrorist groups are also likely to generate new toxic chemical agents. These situations involve unknown compounds and thus may be undetectable using traditional methods. Indeed, standoff gas detection with infrared devices traditionally relies on the comparison between measured signal and a library of signals included in a database. Observing the gas absorption in infrared band III (LWIR 8-14 μm), our multispectral infrared camera is used to detect gas clouds up to a range of several kilometers, to provide identification of gas type and to follow the motion of the cloud in real time. The approach described in this paper develops an algorithm that enables the device to detect gas even if the measured signature is not in the database – a pattern-matching-free algorithm. This detection process has been evaluated in the laboratory and subjected to significant experimental feedback. The results are a capability to detect unknown gases and gas mixtures.

Paper Details

Date Published: 3 May 2017
PDF: 10 pages
Proc. SPIE 10183, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII, 101830C (3 May 2017); doi: 10.1117/12.2275270
Show Author Affiliations
Sylvain Favier, Bertin Technologies (France)
Aymeric Alazarine, Bertin Technologies (France)
Manon Verneau, Bertin Technologies (France)
Romain Verollet, Bertin Technologies (France)
Sébastien Blanchard, Bertin Corp. (United States)

Published in SPIE Proceedings Vol. 10183:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII
Augustus Way Fountain III; Jason A. Guicheteau, Editor(s)

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