Visualization and tomographic analysis of chemical vapor plumes via LWIR imaging Fabry-Perot spectrometry

Bogdan R. Cosofret; Christopher M. Gittins; William J. Marinelli

doi:10.1117/12.570442

14 December 2004 Visualization and tomographic analysis of chemical vapor plumes via LWIR imaging Fabry-Perot spectrometry

Bogdan R. Cosofret, Christopher M. Gittins, William J. Marinelli

Author Affiliations +

Proceedings Volume 5584, Chemical and Biological Standoff Detection II; (2004) https://doi.org/10.1117/12.570442
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

Physical Sciences Inc. (PSI) has recently demonstrated near real-time visualization of chemical vapor plumes via LWIR imaging Fabry-Perot Spectrometry. Simultaneous viewing of the plume from orthogonal lines-of-sight enables estimation of the 3-D plume concentration profile via tomographic analysis of the 2-D 'chemical images' produced by each spectrometer. This paper describes results of field experiments where a controlled release of sulfur hexafluoride (SF₆) was viewed by two Adaptive Infrared Imaging Spectroradiometers (AIRIS) located ~1 km from the plume release point. The PSI tomographic algorithm is capable of generating 3-D density distributions of the chemical cloud that are consistent with atmospheric model predictions even in the extreme limitation of using only two sensors viewing the chemical plume. Each AIRIS unit provides a 64 pixel x 64 pixel image with an angular resolution of ~5.5 mrad/pixel. Each AIRIS was configured to provide continuous coverage of the 10.0-10.8 micrometer spectral region at 6-8 cm^-1 spectral resolution and exhibits a noise equivalent spectral radiance of ~2 micrometer W/(cm² sr micrometer).

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Bogdan R. Cosofret, Christopher M. Gittins, and William J. Marinelli "Visualization and tomographic analysis of chemical vapor plumes via LWIR imaging Fabry-Perot spectrometry", Proc. SPIE 5584, Chemical and Biological Standoff Detection II, (14 December 2004); https://doi.org/10.1117/12.570442

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