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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 9 — May. 5, 2014
  • pp: 11244–11253

Novel gas sensor combined active fiber loop ring-down and dual wavelengths differential absorption method

Yanjie Zhao, Jun Chang, Jiasheng Ni, Qingpu Wang, Tongyu Liu, Chang Wang, Pengpeng Wang, Guangping Lv, and Gangding Peng  »View Author Affiliations


Optics Express, Vol. 22, Issue 9, pp. 11244-11253 (2014)
http://dx.doi.org/10.1364/OE.22.011244


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Abstract

A novel active fiber loop ring-down gas sensor combined with dual wavelengths differential absorption method is proposed. Two Distributed Feedback Laser Diodes (DFB LDs) with different wavelengths are employed. One LD whose wavelength covered with the absorption line of target gas is used for sensing. Another LD whose wavelength is centered outside the absorption line is used for reference. The gas absorption loss can be obtained by differencing the reference signal and sensing signal. Compared with traditional method of one wavelength employed, it can eliminate the influence of the cavity loss variety and photoelectric device drift in the system efficiently. An Erbium Doped Fiber Amplifier (EDFA) with Automatic Gain Control (AGC) is used to compensate the loss of the light in the ring-down cavity, which will increase the cavity round trips and improve the precision of gas detection. And two fiber Bragg gratings (FBGs) are employed to get rid of amplified spontaneous emission (ASE) spectrum noise as filters. The calibrating ethyne samples of different concentrations are measured with a 65 mm long gas cell in order to evaluate the effect of reference. The results show the relative deviation is found to be less than ± 0.4% of 0.1% ethyne when a certain additional loss from 0 to 1.2dB is introduced to the cavity and the relative deviation of measured concentration is less than ± 0.5% over 24 hours.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: January 24, 2014
Revised Manuscript: March 28, 2014
Manuscript Accepted: April 22, 2014
Published: May 2, 2014

Citation
Yanjie Zhao, Jun Chang, Jiasheng Ni, Qingpu Wang, Tongyu Liu, Chang Wang, Pengpeng Wang, Guangping Lv, and Gangding Peng, "Novel gas sensor combined active fiber loop ring-down and dual wavelengths differential absorption method," Opt. Express 22, 11244-11253 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-9-11244


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