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Standoff trace detection of explosives with infrared hyperspectral imagery

: Fuchs, F.; Hugger, S.; Jarvis, J.P.; Yang, Q.K.; Zaum, F.; Ostendorf, R.; Schilling, C.; Bronner, W.; Driad, R.; Aidam, R.; Wagner, J.


George, T. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Micro- and Nanotechnology Sensors, Systems, and Applications VII. Proceedings : 20-24 April, 2015; Baltimore, Maryland, United States
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9467)
ISBN: 9781628415834
Paper 94672O, 10 pp.
Conference "Micro- and Nanotechnology Sensors, Systems, and Applications" <7, 2015, Baltimore/Md.>
Conference Paper
Fraunhofer IAF ()
tunable infrared laser; quantum cascade laser; external cavity laser; standoff detection; active hyperspectral imaging

In this work we present a hyperspectral image sensor based on MIR-laser backscattering spectroscopy for contactless detection of explosive substance traces. The spectroscopy system comprises a tunable Quantum Cascade Laser (QCL) with a tuning range of 7.5 µm to 9.5 µm as an illumination source and a high performance MCT camera for collecting the backscattered light. The resulting measurement data forms a hyperspectral image, where each pixel vector contains the backscattering spectrum of a specific location in the scene. The hyperspectral image data is analyzed for traces of target substances using a state of the art target detection algorithm (the Adaptive Matched Subspace Detector) together with an appropriate background extraction method. The technique is eye-safe and allows imaging detection of a large variety of explosive substances including PETN, RDX, TNT and Ammonium Nitrate. For short stand-off detection distances (<3 m), residues of explosives at an amount of just a few 10 ?g, i.e. traces corresponding to a single fingerprint, could be detected. For larger concentration of explosives, stand-off detection over distances of up to 20 m has already been demonstrated.