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Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline

文献类型：期刊论文

作者Chen, Xiang2,3; Hu, Mai1,3; Liu, Hao1,3; Yao, Lu3; Xu, Zhenyu3; Kan, Ruifeng3
刊名FRONTIERS IN PHYSICS
出版日期2022-09-30
卷号10
ISSN号2296-424X
关键词photoacoustic spectroscopy quartz tuning fork photothermal spectroscopy laser intensity correction first harmonic analysis
DOI10.3389/fphy.2022.1009843
通讯作者Kan, Ruifeng(kanruifeng@aiofm.ac.cn)
英文摘要A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of the prongs. First harmonic (1f) analysis is utilized to process the simultaneously induced photoacoustic and photothermal signals. The optical path length for photothermal spectroscopy is minimized to millimeter level, yielding negligible gas absorption. The demodulated 1f signal can be regarded as the superposition of the photoacoustic signal and the non-absorption photothermal baseline. A good linear relationship (R-2 = 0.999) is observed between amplitude of photothermal baseline and light intensity. QEPAS signal normalized by photothermal baseline shows a good immunity to light intensity variation. An excellent linear response between normalized QEPAS signal and gas concentration is achieved. According to the Allan deviation analysis, the minimum detection limit for CH4 is 0.31 ppm at an integration time of 1,200 s. With this strategy, the precise gas concentration and accurate light intensity of a QEPAS system can be simultaneously obtained with only a single QTF. Compared with the light intensity correction using a photodetector or a power meter, this method entails a low cost and small footprint. It is promising to mitigate the influence from light intensity drift in long-term field measurement of QEPAS systems.
WOS关键词WAVELENGTH-MODULATION SPECTROSCOPY ; LASER
资助项目National Key Research and Development Project ; Foundation from the Key Laboratory of Environmental Optics and Technology ; Strategic Priority Research Program of the Chinese Academy of Sciences ; [2019YFB2006003] ; [2005DP173065-2021-03] ; [XDA22020502]
WOS研究方向Physics
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000868658000001
资助机构National Key Research and Development Project ; Foundation from the Key Laboratory of Environmental Optics and Technology ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/129305]  
专题中国科学院合肥物质科学研究院
通讯作者Kan, Ruifeng
作者单位1.Univ Sci & Technol China, Hefei, Peoples R China
2.Jinlin Inst Technol, Nanjing, Peoples R China
3.Chinese Acad Sci, Hefei Inst Phys Sci, Hefei, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Xiang,Hu, Mai,Liu, Hao,et al. Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline[J]. FRONTIERS IN PHYSICS,2022,10.
APA Chen, Xiang,Hu, Mai,Liu, Hao,Yao, Lu,Xu, Zhenyu,&Kan, Ruifeng.(2022).Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline.FRONTIERS IN PHYSICS,10.
MLA Chen, Xiang,et al."Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline".FRONTIERS IN PHYSICS 10(2022).

入库方式： OAI收割

来源：合肥物质科学研究院

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