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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 12 — Apr. 20, 2002
  • pp: 2263–2273

Optimized differential absorption radiometer for remote sensing of chemical effluents

Gabriel Laufer and Avishai Ben-David  »View Author Affiliations


Applied Optics, Vol. 41, Issue 12, pp. 2263-2273 (2002)
http://dx.doi.org/10.1364/AO.41.002263


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Abstract

A differential absorption radiometer sensor that was optimized for near-perfect (∼2%) correction of the absorption by ambient atmospheric species (e.g., water) is described. A target gas is detected remotely by its IR signature viewed through a bandpass filter centered at one of its strongest lines. A second radiometric measurement obtained through a bandpass filter centered at a frequency optimized to match the absorption by an atmospheric trace species (e.g., water vapor) at the sample filter frequency provides near-perfect correction for dominant background absorption effects. The net absorption (emission) by the target gas was obtained through subtraction of the reference signal of the second measurement from that of the target gas measurement. For multiple species detection, additional sample and reference filter pairs can be configured. Predictions show that detection of strong absorbers such as dimethyl methylphosphonate at an optical density below 100 mg/m2 is possible from distances of <6 km.

© 2002 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(040.1880) Detectors : Detection
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(280.1120) Remote sensing and sensors : Air pollution monitoring

History
Original Manuscript: May 7, 2001
Revised Manuscript: November 5, 2001
Published: April 20, 2002

Citation
Gabriel Laufer and Avishai Ben-David, "Optimized differential absorption radiometer for remote sensing of chemical effluents," Appl. Opt. 41, 2263-2273 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-12-2263

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