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Abstract: Visualization and tomographic analysis of chemical vapor plumes via LWIR imaging Fabry-Perot spectrometry
Bogdan R. Cosofret, Christopher M. Gittins, William J. Marinelli,
"Visualization and tomographic analysis of chemical vapor plumes via LWIR imaging Fabry-Perot spectrometry
,"
presented at SPIE Optics East Chemical and Biological Standoff Detection II
(Philadelphia, PA)
,
(25-28 October2004).
Copyright © 2004 Society of Photo-Optical Instrumentation Engineers.
This paper was published in SPIE Optics East Chemical and Biological Standoff Detection II,
and is made available as an electronic reprint (preprint)
with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple
reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this
paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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 µm spectral region at 6-8 cm-1 spectral
resolution and exhibits a noise equivalent spectral radiance of ˜2 µW/(cm2 sr µm).
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