3 June 2015 Detection and direct identification of liquid contaminants at standoff distances with an imaging polarimetric spectrometer
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Abstract
We demonstrate a remote sensing method, based on an imaging polarimetric spectrometer, to determine the complex refractive index of materials. The approach represents an adaptation of a technique used in semiconductor ellipsometry. Our experimental demonstration setup comprises a Sagnac-type LWIR spatial interferometer (8 - 12 micron) designed for hyperspectral imaging in emission and reflection. The method facilitates direct measurement of the complex refractive index and the thickness of a layer. Presented work focuses on SF96, a liquid surrogate for toxic chemicals, but the method is generally applicable to solids, including soils, and to any substrate with a general bidirectional reflectance distribution function.
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Eugene Tsiang, Eugene Tsiang, Adam Oberbeck, Adam Oberbeck, Jason Akagi, Jason Akagi, Ed Knobbe, Ed Knobbe, } "Detection and direct identification of liquid contaminants at standoff distances with an imaging polarimetric spectrometer", Proc. SPIE 9482, Next-Generation Spectroscopic Technologies VIII, 94820Y (3 June 2015); doi: 10.1117/12.2184493; https://doi.org/10.1117/12.2184493
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