Sensitive Detection of CH4 and CO2 Using Frequency-Division-Multiplexing Based Quartz-Enhanced Photoacoustic Spectroscopy

doi:10.3788/AOS202141.1430003

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	Sensitive Detection of CH4 and CO2 Using Frequency-Division-Multiplexing Based Quartz-Enhanced Photoacoustic Spectroscopy
	H. Liu; M. Hu; X. Chen; H. Deng; Z. Xu; Q. Wang; X. Li; R. Kan and X. Zhang
	2021
发表期刊	Guangxue Xuebao/Acta Optica Sinica
ISSN	2532239
卷号	41 期号:14
摘要	A compact double-gas sensing system was constructed for the simultaneous sensitive detection of CH4 and CO2, which combines quartz-enhanced photoacoustic spectroscopy (QEPAS) and frequency division multiplexing technique. Two continuous wave distributed feedback (DFB) diode lasers operating at central wavelengths of 1654 nm and 2004 nm were employed as the light sources. The photoacoustic signals were first excited by simultaneously injecting sinusoidal modulation currents with independent frequencies near the resonant frequency of the quartz tuning fork into the lasers, and were then demodulated to obtain the corresponding second harmonic components of CH4 and CO2, and finally the simultaneous detection of CH4 and CO2 was realized. The experimental results showed that there was no disturbance between the photoacoustic signals of these two gases. The relationships of CH4 and CO2 concentrations with their corresponding second harmonic signals were calibrated, and a good linear response result was obtained, in which the linear correlation coefficients were all larger than 0.994. The long time measurement of CH4 with volume fraction of 50010-6 and CO2 with volume fraction of 200010-6 was conducted and the system performance was further evaluated through the Allan deviation analysis. The results indicated that the minimum detection limits of CH4 and CO2 for the system were obtained as 0.5810-6 and 1.32 10-6, corresponding to the normalized noise equivalent absorption coefficients of 7.210-9 cm-1WHz1/2 and 910-9 cm-1WHz1/2, respectively. 2021, Chinese Lasers Press. All right reserved.
DOI	10.3788/AOS202141.1430003
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收录类别	EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65619
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	H. Liu,M. Hu,X. Chen,et al. Sensitive Detection of CH4 and CO2 Using Frequency-Division-Multiplexing Based Quartz-Enhanced Photoacoustic Spectroscopy[J]. Guangxue Xuebao/Acta Optica Sinica,2021,41(14).
APA	H. Liu.,M. Hu.,X. Chen.,H. Deng.,Z. Xu.,...&R. Kan and X. Zhang.(2021).Sensitive Detection of CH4 and CO2 Using Frequency-Division-Multiplexing Based Quartz-Enhanced Photoacoustic Spectroscopy.Guangxue Xuebao/Acta Optica Sinica,41(14).
MLA	H. Liu,et al."Sensitive Detection of CH4 and CO2 Using Frequency-Division-Multiplexing Based Quartz-Enhanced Photoacoustic Spectroscopy".Guangxue Xuebao/Acta Optica Sinica 41.14(2021).

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