Ma, YufeiYu, GuangZhang, JingboYu, XinSun, RuiTittel, Frank K.2015-07-092015-07-092015Ma, Yufei, Yu, Guang, Zhang, Jingbo, et al.. "Quartz Enhanced Photoacoustic Spectroscopy Based Trace Gas Sensors Using Different Quartz Tuning Forks." <i>Sensors,</i> 15, no. 4 (2015) MDPI: 7596-7604. http://dx.doi.org/10.3390/s150407596.https://hdl.handle.net/1911/80861A 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.engThis 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).Journal articleQEPASquartz tuning forkresonant frequencyH2O quantificationhttp://dx.doi.org/10.3390/s150407596