Ma, YufeiHe, YingChen, ChengYu, XinZhang, JingboPeng, JiangboSun, RuiTittel, Frank K.2016-09-302016-09-302016Ma, Yufei, He, Ying, Chen, Cheng, et al.. "Planar Laser-Based QEPAS Trace Gas Sensor." <i>Sensors,</i> 16, (2016) MDPI: http://dx.doi.org/10.3390/s16070989.https://hdl.handle.net/1911/91626A 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.engThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license.Journal articleQEPAScylindrical lensplanar laserH2O quantificationhttp://dx.doi.org/10.3390/s16070989