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17 April 2008 Active hyperspectral imaging system for the detection of liquids
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Abstract
The in situ location and identification of discrete liquid droplets on surfaces is a technically challenging problem. Successful solutions often combine real time imaging and optical spectroscopic techniques. To this end, we present results of initial experiments using a dual-band mid- and shortwave IR (1.3 - 4.5 μm) imaging device to differentiate between a selection of mineral and synthetic oils. The illumination source is an optical parametric oscillator comprising a periodically-poled LiNbO3 crystal internally pumped by a Nd:YVO4 laser, which is pumped by a 3 W diode laser. The source can produce output powers of ca. 0.3 and 0.1 W in the signal and idler fields, respectively. System size and complexity are minimised by use of an MCT single element detector and images are acquired by raster scanning of the target. The reflection, absorption and/or scatter of the incident radiation by the liquids and their surroundings provide a method for spatial location, whereas the characteristic spectra obtained from each sample can be used to uniquely identify the deposited substance. Both static and video images can be obtained at a range of < 10 metres by this apparatus.
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Chris R. Howle, David J. M. Stothard, Cameron F. Rae, Mark Ross, Ben S. Truscott, Christopher D. Dyer, and Malcolm H. Dunn "Active hyperspectral imaging system for the detection of liquids", Proc. SPIE 6954, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing IX, 69540L (17 April 2008); https://doi.org/10.1117/12.787452
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