Detection and direct identification of liquid contaminants at standoff distances with an imaging polarimetric spectrometer

Eugene Tsiang; Adam Oberbeck; Jason Akagi; Ed Knobbe

doi:10.1117/12.2184493

3 June 2015 Detection and direct identification of liquid contaminants at standoff distances with an imaging polarimetric spectrometer

Eugene Tsiang, Adam Oberbeck, Jason Akagi, Ed Knobbe

Author Affiliations +

Proceedings Volume 9482, Next-Generation Spectroscopic Technologies VIII; 94820Y (2015) https://doi.org/10.1117/12.2184493
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

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.

Citation Download Citation

Eugene Tsiang, Adam Oberbeck, Jason Akagi, and 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); https://doi.org/10.1117/12.2184493

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