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Applied Optics

Applied Optics


  • Vol. 42, Iss. 33 — Nov. 20, 2003
  • pp: 6696–6703

Passive standoff detection of Bacillus subtilis aerosol by Fourier-transform infrared radiometry

Jean-Marc Thériault, Eldon Puckrin, and James O. Jensen  »View Author Affiliations

Applied Optics, Vol. 42, Issue 33, pp. 6696-6703 (2003)

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An analysis is presented on the passive standoff detection and identification of Bacillus subtilis (BG) clouds with the Compact ATmospheric Sounding Interferometer (CATSI) sensor. This research is based on recent spectral measurements obtained during the Technology Readiness Evaluation trial held July 2002 at Dugway Proving Ground, Utah. Results obtained from three trial BG cloud episodes are used to explain and demonstrate the detection capability of the CATSI sensor. The BG clouds were measured at a distance of 3 km from the sensor in a near-horizontal path scenario. It was found that the low thermal contrast of approximately 0.2 K between the BG cloud and the background yielded weak but observable spectral signatures. The processing of the spectral signatures with the GASeous Emission Monitoring (GASEM) algorithm has provided a rough estimate of BG cloud column densities. The results of a series of simulations with the FASCOD3 transmission model have shown that the detection sensitivity for BG can be greatly improved for both slant path uplooking and downlooking scenarios.

© 2003 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.1100) Remote sensing and sensors : Aerosol detection
(300.0300) Spectroscopy : Spectroscopy
(300.2140) Spectroscopy : Emission

Original Manuscript: March 21, 2003
Revised Manuscript: July 3, 2003
Published: November 20, 2003

Jean-Marc Thériault, Eldon Puckrin, and James O. Jensen, "Passive standoff detection of Bacillus subtilis aerosol by Fourier-transform infrared radiometry," Appl. Opt. 42, 6696-6703 (2003)

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