期刊
PHOTOACOUSTICS
卷 20, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2020.100206
关键词
trace gas sensing; quartz tuning fork; photothermal spectroscopy; M-QEPTS
类别
资金
- National Natural Science Foundation of China [62022032, 61875047, 61505041]
- Natural Science Foundation of Heilongjiang Province of China [YQ2019F006]
- Fundamental Research Funds for the Central Universities
- Heilongjiang Province Postdoctoral Foundation [LBH-Q18052]
- Robert Welch Foundation [C0586]
A multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) based trace gas detection method is reported for the first time. Different from traditional QEPTS sensor employing a single quartz tuning fork (QTF) as a photothermal detector, two QTFs were used in M-QEPTS to increase the signal amplitude by adding the generated piezoelectric signals. The coating film of the QTFs was removed in order to improve the laser absorption and transmission. Acetylene (C2H2) was chosen as the target analyte. Wavelength modulation spectroscopy (WMS) and 2nd harmonic detection were utilized for the concentration detection. Limit of detection (LoD) of 0.97 ppm was achieved with a 1 second integration time for the M-QEPTS sensor, which realized a 1.51 times signal enhancement compared to a traditional QEPTS sensor employing a single QTF. By using an Allan deviation analysis approach, LoD of 0.19 ppm for an optimum integration time of 200 s was obtained.
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