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Special Section on Quantum and Interband Cascade Lasers

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

[+] Author Affiliations
Frank Fuchs, Stefan Hugger, Michel Kinzer, Rolf Aidam, Wolfgang Bronner, Rainer Lösch, Quankui Yang

Fraunhofer Institute for AppliedSolid State Physics, Tullastraße 72, 79108 Freiburg, Germany

Kai Degreif

Fraunhofer Institute for Physical MeasurementTechniques, Heidenhofstraße 8, 79110 Freiburg, Germany

Frank Schnürer

Fraunhofer Institute for Chemical Technology, Joseph-von-Fraunhofer-Straße 7, 76327 Pfinztal, Germany

Opt. Eng. 49(11), 111127 (November 22, 2010). doi:10.1117/1.3506195
History: Received April 15, 2010; Revised August 13, 2010; Accepted September 14, 2010; Published November 22, 2010; Online November 22, 2010
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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.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Frank Fuchs ; Stefan Hugger ; Michel Kinzer ; Rolf Aidam ; Wolfgang Bronner, et al.
"Imaging standoff detection of explosives using widely tunable midinfrared quantum cascade lasers", Opt. Eng. 49(11), 111127 (November 22, 2010). ; http://dx.doi.org/10.1117/1.3506195


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