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Optical Engineering

Imaging standoff detection of explosives using widely tunable midinfrared quantum cascade lasers
Author(s): Frank Fuchs; Stefan Hugger; Michel Kinzer; Rolf Aidam; Wolfgang Bronner; Rainer Lösch; Quankui K. Yang; Kai A. Degreif; Frank H. Schnürer
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Paper Abstract

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.

Paper Details

Date Published: 1 November 2010
PDF: 8 pages
Opt. Eng. 49(11) 111127 doi: 10.1117/1.3506195
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
Frank Fuchs, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Stefan Hugger, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Michel Kinzer, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Rolf Aidam, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Wolfgang Bronner, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Rainer Lösch, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Quankui K. Yang, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Kai A. Degreif, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
Frank H. Schnürer, Fraunhofer-Institut für Chemische Technologie (Germany)


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