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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 18 — Jun. 20, 2011
  • pp: 3028–3042

Impact of atmospheric clutter on Doppler-limited gas sensors in the submillimeter/terahertz

Ivan R. Medvedev, Christopher F. Neese, Grant M. Plummer, and Frank C. De Lucia  »View Author Affiliations


Applied Optics, Vol. 50, Issue 18, pp. 3028-3042 (2011)
http://dx.doi.org/10.1364/AO.50.003028


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Abstract

It is well known that clutter (spectral interference) from atmospheric constituents can be a severe limit for spectroscopic point sensors, especially where high sensitivity and specificity are required. In this paper, we will show for submillimeter/terahertz (SMM/THz) sensors that use cw electronic techniques the clutter limit for the detection of common target gases with absolute specificity (probability of false alarm 10 10 ) is in the ppt (1 part in 10 12 ) range or lower. This is because the most abundant atmospheric gases are either transparent to SMM/THz radiation (e.g., CO 2 ) or have spectra that are very sparse relative to the 10 5 Doppler-limited resolution elements available (e.g., H 2 O ). Moreover, the low clutter limit demonstrated for cw electronic systems in the SMM/THz is independent of system size and complexity.

© 2011 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6370) Spectroscopy : Spectroscopy, microwave
(300.6390) Spectroscopy : Spectroscopy, molecular
(280.1545) Remote sensing and sensors : Chemical analysis
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: November 24, 2010
Revised Manuscript: March 17, 2011
Manuscript Accepted: April 13, 2011
Published: June 17, 2011

Citation
Ivan R. Medvedev, Christopher F. Neese, Grant M. Plummer, and Frank C. De Lucia, "Impact of atmospheric clutter on Doppler-limited gas sensors in the submillimeter/terahertz," Appl. Opt. 50, 3028-3042 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-18-3028

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