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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13170–13189

Remote open-path cavity-ringdown spectroscopic sensing of trace gases in air, based on distributed passive sensors linked by km-long optical fibers

Yabai He, Chunjiang Jin, Ruifeng Kan, Jianguo Liu, Wenqing Liu, Julian Hill, Ian M. Jamie, and Brian J. Orr  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 13170-13189 (2014)

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A continuous-wave, rapidly swept cavity-ringdown spectroscopic technique has been developed for localized atmospheric sensing of trace gases at remote sites. It uses one or more passive open-path optical sensor units, coupled by optical fiber over distances of >1 km to a single transmitter/receiver console incorporating a photodetector and a swept-frequency diode laser tuned to molecule-specific near-infrared wavelengths. Ways to avoid interference from stimulated Brillouin scattering in long optical fibers have been devised. This rugged open-path system, deployable in agricultural, industrial, and natural atmospheric environments, is used to monitor ammonia in air. A noise-limited minimum detectable mixing ratio of ~11 ppbv is attained for ammonia in nitrogen at atmospheric pressure.

© 2014 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.3420) Remote sensing and sensors : Laser sensors

ToC Category:

Original Manuscript: February 28, 2014
Revised Manuscript: May 14, 2014
Manuscript Accepted: May 14, 2014
Published: May 22, 2014

Yabai He, Chunjiang Jin, Ruifeng Kan, Jianguo Liu, Wenqing Liu, Julian Hill, Ian M. Jamie, and Brian J. Orr, "Remote open-path cavity-ringdown spectroscopic sensing of trace gases in air, based on distributed passive sensors linked by km-long optical fibers," Opt. Express 22, 13170-13189 (2014)

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