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5 October 2011 Hazardous liquid detection by active hyperspectral imaging
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The ability to remotely locate and classify potential liquid hazards is desirable in a variety of civilian and military applications. Candidate technologies to satisfy these requirements include the fusion of imaging and optical spectroscopy. Hence, a novel system based on IR Negative Contrast Imaging (NCI) is presented. The NCI system is based on an OPO comprising a periodically-poled LiNbO3 (PPLN) crystal of fanned grating design that operates in both the shortwave and midwave IR spectral regions (1.5 - 1.9 μm and 2.4 - 3.8 μm, respectively). Wavelength tuning is achieved by translating the PPLN crystal within the 1064 nm pump beam. System size and complexity are minimised by the use of InGaAs and Zn doped MCT single element detectors and the intracavity OPO design. Images are composed by raster scanning the monochromatic beam over the scene of interest; the reflection and/or absorption of the incident radiation by target chemicals and their surrounding environment provide a method for spatial location of the hazard. The NCI has been employed to detect liquid chemicals on a variety of surfaces; initial results of laboratory investigations are presented here.
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Chris R. Howle, Alexander Frisby, Alastair J. S. McIntosh, David J. M. Stothard, Malcolm H. Dunn, Gordon Robertson, William Miller, Graeme Malcolm, and Gareth Maker "Hazardous liquid detection by active hyperspectral imaging", Proc. SPIE 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security, 81890H (5 October 2011);

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