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

70 Citations (Scopus)


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
Issue number4
Publication statusPublished - 15 Feb 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Miniature fiber-tip photoacoustic spectrometer for trace gas detection'. Together they form a unique fingerprint.

Cite this