基于频分复用石英音叉增强型光声光谱技术的ch4和co2测量研究

Hao, 刘浩 Liu; Hu, 胡迈; Xiang, 陈祥 Chen; Hao, 邓昊 Deng; Zhenyu, 许振宇 Xu; Qiang, 王强 Wang; Xiang, 李想 Li; Ruifeng, 阚瑞峰 Kan; Xianyi, 张先燚 Zhang

doi:10.3788/aos202141.1430003

光学学报

2021

DOI: 10.3788/aos202141.1430003

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基于频分复用石英音叉增强型光声光谱技术的ch4和co2测量研究

刘浩 Liu Hao¹,

胡迈 Hu²,

陈祥 Chen Xiang³

et al.

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

Chen

Hu²,

Líu³

et al. 2022

Front. Phys.

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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 (R2 = 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.

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

Chen

Hu²,

Líu³

et al. 2022

Front. Phys.

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show abstract

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基于频分复用石英音叉增强型光声光谱技术的ch4和co2测量研究

Cited by 1 publication

References 1 publication

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

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

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