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Sensors 2015, 15(4), 7596-7604; doi:10.3390/s150407596

Quartz Enhanced Photoacoustic Spectroscopy Based Trace Gas Sensors Using Different Quartz Tuning Forks

1
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
2
Post-doctoral Mobile Station of Power Engineering and Engineering Thermophysics, Harbin Institute of Technology, Harbin 150001, China
3
Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
*
Authors to whom correspondence should be addressed.
Academic Editors: Gary R. Pickrell and Daniel Homa
Received: 4 February 2015 / Revised: 9 March 2015 / Accepted: 20 March 2015 / Published: 27 March 2015
(This article belongs to the Special Issue Optical Sensors for Chemical, Biological and Industrial Applications)
View Full-Text   |   Download PDF [1378 KB, uploaded 27 March 2015]   |  

Abstract

A sensitive trace gas sensor platform based on quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. A 1.395 μm continuous wave (CW), distributed feedback pigtailed diode laser was used as the excitation source and H2O was selected as the target analyte. Two kinds of quartz tuning forks (QTFs) with a resonant frequency (f0) of 30.72 kHz and 38 kHz were employed for the first time as an acoustic wave transducer, respectively for QEPAS instead of a standard QTF with a f0 of 32.768 kHz. The QEPAS sensor performance using the three different QTFs was experimentally investigated and theoretically analyzed. A minimum detection limit of 5.9 ppmv and 4.3 ppmv was achieved for f0 of 32.768 kHz and 30.72 kHz, respectively. View Full-Text
Keywords: QEPAS; quartz tuning fork; resonant frequency; H2O quantification QEPAS; quartz tuning fork; resonant frequency; H2O quantification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ma, Y.; Yu, G.; Zhang, J.; Yu, X.; Sun, R.; Tittel, F.K. Quartz Enhanced Photoacoustic Spectroscopy Based Trace Gas Sensors Using Different Quartz Tuning Forks. Sensors 2015, 15, 7596-7604.

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