Miniature fiber-tip photoacoustic spectrometer for trace gas detection

Yingchun Cao, Wei Jin, Hoi Lut Ho, Jun Ma

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)434-436
Number of pages3
JournalOptics Letters
Volume38
Issue number4
DOIs
Publication statusPublished - 15 Feb 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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