26 January 2009 Explosive detection using infrared laser spectroscopy
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Stand-off and extractive explosive detection methods for short distances are investigated using mid-infrared laser spectroscopy. A quantum cascade laser (QCL) system for TATP-detection by open path absorption spectroscopy in the gas phase was developed. In laboratory measurements a detection limit of 5 ppm*m was achieved. For explosives with lower vapor pressure an extractive hollow fiber based measurement system was investigated. By thermal desorption gaseous TATP or TNT is introduced into a heated fiber. The small sample volume and a fast gas exchange rate enable fast detection. TNT and TATP detection levels below 100 ng are feasible even in samples with a realistic contaminant background.
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J. Hildenbrand, J. Hildenbrand, J. Herbst, J. Herbst, J. Wöllenstein, J. Wöllenstein, A. Lambrecht, A. Lambrecht, } "Explosive detection using infrared laser spectroscopy", Proc. SPIE 7222, Quantum Sensing and Nanophotonic Devices VI, 72220B (26 January 2009); doi: 10.1117/12.808976; https://doi.org/10.1117/12.808976

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