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Sensors 2016, 16(7), 989; doi:10.3390/s16070989

Planar Laser-Based QEPAS Trace Gas Sensor

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 Editor: Dragan Indjin
Received: 17 April 2016 / Revised: 22 June 2016 / Accepted: 23 June 2016 / Published: 28 June 2016
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
View Full-Text   |   Download PDF [2331 KB, uploaded 28 June 2016]   |  

Abstract

A novel quartz enhanced photoacoustic spectroscopy (QEPAS) trace gas detection scheme is reported in this paper. A cylindrical lens was employed for near-infrared laser focusing. The laser beam was shaped as a planar line laser between the gap of the quartz tuning fork (QTF) prongs. Compared with a spherical lens-based QEPAS sensor, the cylindrical lens-based QEPAS sensor has the advantages of easier laser beam alignment and a reduction of stringent stability requirements. Therefore, the reported approach is useful in long-term and continuous sensor operation. View Full-Text
Keywords: QEPAS; cylindrical lens; planar laser; H2O quantification QEPAS; cylindrical lens; planar laser; H2O quantification
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MDPI and ACS Style

Ma, Y.; He, Y.; Chen, C.; Yu, X.; Zhang, J.; Peng, J.; Sun, R.; Tittel, F.K. Planar Laser-Based QEPAS Trace Gas Sensor. Sensors 2016, 16, 989.

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