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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 |
Issue Date: | 15-Feb-2013 | Source: | Optics letters, 15 Feb. 2013, v. 38, no. 4, p. 434-436 | 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. | Keywords: | Fiber optics sensors Optical sensing and sensors Spectroscopy, diode lasers |
Publisher: | Optical Society of America | Journal: | Optics letters | 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. |
Appears in Collections: | Journal/Magazine Article |
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Cao_Miniature_Fiber-tip_Photoacoustic.pdf | 411.67 kB | Adobe PDF | View/Open |
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