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Proceedings Paper

Towards a compact, portable, handheld device for contactless real-time standoff detection of hazardous substances
Author(s): Christopher Carson; John Macarthur; Matthew Warden; David Stothard; Lorenz Butschek; Stefan Hugger; Jan-Philip Jarvis; Marko Haertelt; Ralf Ostendorf; Andre Merten; Markus Schwarzenberg; Jan Grahmann; Marcin Ratajczyk
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Paper Abstract

Here we report our recent achievements towards a compact, portable, handheld device for contactless real-time detection and identification of explosives and hazardous substances via reflectance spectroscopy in the 7.5 μm – 10 μm spectral region. The mid-IR spectroscopic measurement principle relies on selective illumination of the target using broadly tunable external cavity quantum cascade lasers (EC-QCLs). A resonant micro-opto-electro-mechanical systems (MOEMS) grating enables fast wavelength tuning in the external cavity, allowing the full spectral scan to be completed in <1 ms. The diffusely backscattered light’s intensity dependence on illumination wavelength provides spectroscopic information to identify threat compounds via our spectral database, containing a large number of materials relevant in a security context. We present a handheld portable, albeit tethered, device capable of real-time identification of hazardous substances at a range of 1 m. We will outline future improvements to increase the system’s usability, such as integrated computing power, automated focusing to that allow use over a range of detection distances and spatial scanning for background subtraction.

Paper Details

Date Published: 29 May 2018
PDF: 7 pages
Proc. SPIE 10624, Infrared Technology and Applications XLIV, 106240F (29 May 2018); doi: 10.1117/12.2305711
Show Author Affiliations
Christopher Carson, Fraunhofer Ctr. for Applied Photonics (United Kingdom)
John Macarthur, Fraunhofer Ctr. for Applied Photonics (United Kingdom)
Matthew Warden, Fraunhofer Ctr. for Applied Photonics (United Kingdom)
David Stothard, Fraunhofer Ctr. for Applied Photonics (United Kingdom)
Lorenz Butschek, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Stefan Hugger, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Jan-Philip Jarvis, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Marko Haertelt, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Ralf Ostendorf, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Andre Merten, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Markus Schwarzenberg, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Jan Grahmann, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Marcin Ratajczyk, VIGO System S.A. (Poland)

Published in SPIE Proceedings Vol. 10624:
Infrared Technology and Applications XLIV
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; John Lester Miller; Paul R. Norton, Editor(s)

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