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

doi:10.3389/fphy.2022.1009843

	Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline
	Chen, Xiang 2,3; Hu, Mai 1,3; Liu, Hao 1,3; Yao, Lu 3; Xu, Zhenyu 3; Kan, Ruifeng 3
刊名	FRONTIERS IN PHYSICS
	2022-09-30
卷号	10
关键词	photoacoustic spectroscopy quartz tuning fork photothermal spectroscopy laser intensity correction first harmonic analysis
ISSN号	2296-424X
DOI	10.3389/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.
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关键词	WAVELENGTH-MODULATION SPECTROSCOPY ; LASER
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
内容类型	期刊论文
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).