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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 4 — Feb. 15, 2013
  • pp: 434–436

Miniature fiber-tip photoacoustic spectrometer for trace gas detection

Yingchun Cao, Wei Jin, Hoi Lut Ho, and Jun Ma  »View Author Affiliations

Optics Letters, Vol. 38, Issue 4, pp. 434-436 (2013)

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We demonstrate a fiber-tip photoacoustic spectrometric sensor for trace gas detection. The sensor head is a miniature fiber-tip hollow-cavity with a deflectable polymer diaphragm. Periodic light absorption of gas molecules within the cavity generates an acoustic pressure wave, which causes deflection of the diaphragm. The hollow cavity also is a Fabry–Perot interferometer with which the diaphragm deflection is detected with high sensitivity. Experimental test around the P(9) absorption line of C2H2 achieved a minimum detectable gas concentration of 4.3 ppm with an excitation laser power of 8 mW. The miniature sensor head and fiber optic detection system make this type of spectrometers ideally suited for remote and space-limited applications as well as for multipoint detection in a multiplexed fiber optic sensor network.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 27, 2012
Revised Manuscript: December 13, 2012
Manuscript Accepted: January 4, 2013
Published: February 8, 2013

Yingchun Cao, Wei Jin, Hoi Lut Ho, and Jun Ma, "Miniature fiber-tip photoacoustic spectrometer for trace gas detection," Opt. Lett. 38, 434-436 (2013)

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