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Proceedings Paper

Hazardous liquid detection by active hyperspectral imaging
Author(s): Chris R. Howle; Alexander Frisby; Alastair J. S. McIntosh; David J. M. Stothard; Malcolm H. Dunn; Gordon Robertson; William Miller; Graeme Malcolm; Gareth Maker
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Paper Abstract

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.

Paper Details

Date Published: 5 October 2011
PDF: 8 pages
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); doi: 10.1117/12.898516
Show Author Affiliations
Chris R. Howle, Defence Science and Technology Lab. (United Kingdom)
Alexander Frisby, Defence Science and Technology Lab. (United Kingdom)
Alastair J. S. McIntosh, Defence Science and Technology Lab. (United Kingdom)
David J. M. Stothard, Univ. of St. Andrews (United Kingdom)
Malcolm H. Dunn, Univ. of St. Andrews (United Kingdom)
Gordon Robertson, M Squared Lasers Ltd. (United Kingdom)
William Miller, M Squared Lasers Ltd. (United Kingdom)
Graeme Malcolm, M Squared Lasers Ltd. (United Kingdom)
Gareth Maker, M Squared Lasers Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 8189:
Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security
Roberto Zamboni; Mark T. Gruneisen; Colin Lewis; Miloslav Dusek; Douglas Burgess; François Kajzar; Attila A. Szep; John G. Rarity, Editor(s)

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