30 October 2012 Identification and mapping of spilled liquids by passive hyperspectral imaging
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The feasibility of stand-off detection of liquid surface contamination by means of hyperspectral imaging has been shown in previous studies. Our previous studies focused on measurements using an active set-up in which the sample is illuminated by an infrared radiation source. In this work, passive measurements of spilled liquids are presented that were performed under the open sky and without illumination by an active source. Because the spectra depend on the liquid (composition and layer thickness), the optical properties of the background material, and on the radiation of the surrounding hemisphere that is incident on the sample, a comprehensive radiative transfer model has been developed and applied to calculate spectra of the specific liquid-substrate combination. The comparison of calculated and measured spectra allows the visualization of contaminated areas, the detection, and the identification of the liquids. The agreement between measured and modelled spectra is excellent. This shows that the automatic identification of liquid surface contaminants is possible using a passive setup and that the proposed model is applicable for the approximation of the measured spectra.
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René Braun, René Braun, Roland Harig, Roland Harig, "Identification and mapping of spilled liquids by passive hyperspectral imaging", Proc. SPIE 8546, Optics and Photonics for Counterterrorism, Crime Fighting, and Defence VIII, 85460F (30 October 2012); doi: 10.1117/12.974496; https://doi.org/10.1117/12.974496

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