中国科学院长春光学精密机械与物理研究所

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	Simultaneous detection of greenhouse gases CH4 and CO2 based on a dual differential photoacoustic spectroscopy system
	F. P. Wang, J. H. Wu, Y. P. Cheng, L. Y. Fu, J. G. Zhang and Q. Wang
	2023
发表期刊	Optics Express
ISSN	1094-4087
卷号	31期号:21页码:33898-33913
摘要	In addition to the atmospheric measurement, detection of dissolved carbon oxides and hydrocarbons in a water region is also an important aspect of greenhouse gas monitoring, such as CH4 and CO2. The first step of measuring dissolved gases is the separation process of water and gases. However, slow degassing efficiency is a big challenge which requires the gas detection technology itself with low gas consumption. Photoacoustic spectroscopy (PAS) is a good choice with advantages of high sensitivity, low gas consumption, and zero background, which has been rapidly developed in recent years and is expected to be applied in the field of dissolved gas detection. In this study, a miniaturized differential photoacoustic cell with a volume of 7.9 mL is designed for CH4 and CO2 detection, and a dual differential method with four microphones is proposed to enhance the photoacoustic signal. What we believe to be a new method increases photoacoustic signal by 4 times and improves the signal to noise ratio (SNR) over 10 times compared with the conventional single-microphone mode. Two distributed feedback (DFB) lasers at 1651 nm and 2004nm are employed to construct the PAS system for CH4 and CO2 detection respectively. Wavelength modulation spectroscopy (WMS) and 2nd harmonic demodulation techniques are applied to further improve the SNR. As a result, sensitivity of 0.44 ppm and 7.39 ppm for CH4 and CO2 are achieved respectively with an integration time of 10 s. Allan deviation analysis indicates that the sensitivity can be further improved to 42 ppb (NNEA=4.7x10-10cm-1WHz-1/2) for CH4 and 0.86 ppm (NNEA=5.3x10-10cm-1WHz-1/2) for CO2 when the integration time is extended to 1000 s.
DOI	10.1364/oe.503454
URL	查看原文
收录类别	sci ; ei
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67921
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	F. P. Wang, J. H. Wu, Y. P. Cheng, L. Y. Fu, J. G. Zhang and Q. Wang. Simultaneous detection of greenhouse gases CH4 and CO2 based on a dual differential photoacoustic spectroscopy system[J]. Optics Express,2023,31(21):33898-33913.
APA	F. P. Wang, J. H. Wu, Y. P. Cheng, L. Y. Fu, J. G. Zhang and Q. Wang.(2023).Simultaneous detection of greenhouse gases CH4 and CO2 based on a dual differential photoacoustic spectroscopy system.Optics Express,31(21),33898-33913.
MLA	F. P. Wang, J. H. Wu, Y. P. Cheng, L. Y. Fu, J. G. Zhang and Q. Wang."Simultaneous detection of greenhouse gases CH4 and CO2 based on a dual differential photoacoustic spectroscopy system".Optics Express 31.21(2023):33898-33913.

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