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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 33 — Nov. 20, 2006
  • pp: 8537–8540

Multiline absorption spectroscopy for methane gas detection

Yi Qu, Zhi-Hui Kang, Yun Jiang, and Jin-Yue Gao  »View Author Affiliations

Applied Optics, Vol. 45, Issue 33, pp. 8537-8540 (2006)

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A multiline absorption spectroscopy technique was investigated based on the single-line absorption spectroscopy technique. An open-path methane-detecting system was designed. An LED was used as a broadband source, and a Fabry–Perot interferometer whose transmission peaks matched the methane R-branch absorption lines was used to enhance the detectable sensitivity. We demonstrate a minimum-detectable concentration of 7600 ± 10% ppm (parts per million) with a multiline differential absorption spectroscopy technique and a concentration of 1000 ± 10% ppm with a multiline wavelength modulation spectroscopy technique.

© 2006 Optical Society of America

OCIS Codes
(280.1910) Remote sensing and sensors : DIAL, differential absorption lidar
(300.6380) Spectroscopy : Spectroscopy, modulation
(350.2450) Other areas of optics : Filters, absorption

Original Manuscript: March 17, 2006
Revised Manuscript: August 17, 2006
Manuscript Accepted: September 1, 2006

Yi Qu, Zhi-Hui Kang, Yun Jiang, and Jin-Yue Gao, "Multiline absorption spectroscopy for methane gas detection," Appl. Opt. 45, 8537-8540 (2006)

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