29 May 2018 Towards a compact, portable, handheld device for contactless real-time standoff detection of hazardous substances
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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.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christopher Carson, Christopher Carson, John Macarthur, John Macarthur, Matthew Warden, Matthew Warden, David Stothard, David Stothard, Lorenz Butschek, Lorenz Butschek, Stefan Hugger, Stefan Hugger, Jan-Philip Jarvis, Jan-Philip Jarvis, Marko Haertelt, Marko Haertelt, Ralf Ostendorf, Ralf Ostendorf, Andre Merten, Andre Merten, Markus Schwarzenberg, Markus Schwarzenberg, Jan Grahmann, Jan Grahmann, Marcin Ratajczyk, Marcin Ratajczyk, "Towards a compact, portable, handheld device for contactless real-time standoff detection of hazardous substances", Proc. SPIE 10624, Infrared Technology and Applications XLIV, 106240F (29 May 2018); doi: 10.1117/12.2305711; https://doi.org/10.1117/12.2305711

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