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13 October 2011 Remote detection of liquid surface contamination by imaging infrared spectroscopy: measurements and modelling
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Abstract
Previous studies showed that imaging infrared spectrometry allows remote detection and identification of traces of potentially hazardous liquid surface contaminants. Because the spectra depend on the liquid (composition and thickness), the background material, and on the illumination of the surface, a comprehensive radiative transfer model has been developed and applied to calculate synthetic spectra which are used to approximate measured spectra; these simulated spectra are compared to experimentally acquired data. The model requires spectra of the complex refractive indices of the liquids. These spectra were calculated by applying the Kramers-Kronig relations to spectra of the linear absorption coefficient, which are contained in commonly available spectral libraries. As the agreement between measured and modelled spectra of liquids on different surfaces is excellent, the results confirm the validity of the model.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
René Braun, Jens Eichmann, Samer Sabbah, Roland Harig, and Chris R. Howle "Remote detection of liquid surface contamination by imaging infrared spectroscopy: measurements and modelling", 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, 81890G (13 October 2011); https://doi.org/10.1117/12.899065
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