Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7099
Title: Miniature fiber-tip photoacoustic spectrometer for trace gas detection
Authors: Cao, Y
Jin, W 
Ho, HL
Ma, J
Keywords: Fiber optics sensors
Optical sensing and sensors
Spectroscopy, diode lasers
Issue Date: 15-Feb-2013
Publisher: Optical Society of America
Source: Optics letters, 15 Feb. 2013, v. 38, no. 4, p. 434-436 How to cite?
Journal: Optics letters 
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.
URI: http://hdl.handle.net/10397/7099
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.38.000434
Rights: © 2013 Optical Society of America
This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-4-434. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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