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Imaging standoff detection of explosives using widely tunable midinfrared quantum cascade lasers

: Fuchs, F.; Hugger, S.; Kinzer, M.; Aidam, R.; Bronner, W.; Lösch, R.; Yang, Q.K.; Degreif, K.; Schnürer, F.

Fulltext urn:nbn:de:0011-n-1484112 (2.2 MByte PDF)
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Copyright 2010 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Created on: 15.8.2013

Optical engineering 49 (2010), No.11, Art. 111127, 8 pp.
ISSN: 0091-3286
ISSN: 0036-1860
ISSN: 1560-2303
Journal Article, Electronic Publication
Fraunhofer IAF ()
Fraunhofer IPM ()
Fraunhofer ICT ()
CBRNE detection; infrared spectroscopy; stand-off detection; remote sensing; infrared laser; quantum cascade laser; external cavity laser

The use of a tunable midinfrared external cavity quantum cascade laser for the standoff detection of explosives at medium distances between 2 and 5 m is presented. For the collection of the diffusely backscattered light, a high-performance infrared imager was used. Illumination and wavelength tuning of the laser source was synchronized with the image acquisition, establishing a hyperspectral data cube. Sampling of the backscattered radiation from the test samples was performed in a noncooperative geometry at angles of incidence far away from specular reflection. We show sensitive detection of traces of trinitrotoluene and pentaerythritol tetranitrate on real-world materials, such as standard car paint, polyacrylics from backpacks, and jeans fabric. Concentrations corresponding to fingerprints were detected, while concepts for false alarm suppression due to cross-contaminations were presented.