Past chemical warfare agent attacks often mention the use of mixtures of chemicals or impure-incomplete formulation. Terrorist groups may also generate new chemical toxic agents. Those situations involve unknown compounds and thus may be undetectable by traditional methods. Indeed, standoff gas detection with infrared devices traditionally relies on the comparison between measured signal with 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 – pattern-matching-free algorithm. This detection process has been evaluated in the laboratory and subjected to significant experimental feedbacks. The results are a capability to detect unknown gases and gas mixtures.
Le Brun Gay, Aymeric Alazarine, Sylvain Favier, and Sébastien Blanchard, "Detecting unknown chemical clouds at distance with multispectral imagery," Proc. SPIE 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX, 106290X (Presented at SPIE Defense + Security: April 17, 2018; Published: 16 May 2018); https://doi.org/10.1117/12.2305362.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the proceedings. They include the speaker's narration with video of the slides and animations. Most include full-text papers. Interactive, searchable transcripts and closed captioning are now available for most presentations.
Search our growing collection of more than 22,000 conference presentations, including many plenaries and keynotes.