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| Trace Methane Detection Based on Cavity Ring-Down Spectroscopy |
| SONG Shao-man1, 2, YAN Chang-xiang1, 3* |
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Center of Materials Science and Optoelectrics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In order to accurately measure the trace methane (CH4) concentration in nitrogen, a continuous wave-Cavity Ring-Down Spectrometer (CW-CRDS) measuring device based on the triangular annular cavity was designed and built. The ring-down cavity is designed for autonomous processing. It consists of a concave mirror with a radius of curvature of 1 m and a diameter of 25 mm and two plane mirrors with a diameter of 12.7 mm. The total length of the optical path in the cavity is 410 mm, and the cavity material is Invar. First, we measured the baseline loss of the system, and then used nitrogen as the mixture to configure a mixture of five different concentrations of CH4 and N2. The gas was detected by the absorption peak of CH4 at 1 653.7 nm (CH4ν3 with R5). According to the absorption line characteristics, the attenuation time constant τ is calculated by the least square method using the Lorentz linear function and the CH4 concentration is calculated. The detection sensitivity of the built device to the methane volume concentration can reach 54×10-9 (540 million). Finally, the absorption spectrum of CH4 with a volume concentration of 510×10-9 in the range of 6 046.7~6 047.2 cm-1 was measured, and the measured data was determined according to the cavity free spectrum. The range (Free Spectral Range, FSR) is fitted to the τ and the absorption coefficient respectively. The obtained CH4 absorption coefficient is compared with the data in the database. The maximum error is less than 1.2×10-9 cm-1, and the highest precision is 8.8×10 -11 cm-1.
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Received: 2019-04-19
Accepted: 2019-08-28
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Corresponding Authors:
YAN Chang-xiang
E-mail: yancx@ciomp.ac.cn
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[1] WANG Xiao-hua, WANG Kai-di, YU Jin, et al(王晓华，王凯迪，余 锦，等). Science Technology and Engineering(科学技术与工程)，2017, 17(14): 120.
[2] ZHOU Hai-bo, SHAO Jie, QIAN Hui-guo, et al(周海波, 邵 杰, 钱惠国，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2019, 39(3)：673.
[3] Tanaka T, Yates E, Iraci L T, et al. IEEE Transactions on Geoscience and Remote Sensing, 2016, 54(8): 1.
[4] World Meteorological Organization(WMO). Greenhouse Gas Bulletin: the State of Greenhouse Gases in the Atmosphere Using Global Observations through 2009. World Meteordogical Organization(WMO)，2010.
[5] LI Zhi-xin, FU Xiao-fang, TAN Wei, et al(李志新, 付小芳, 谭 巍，等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报), 2012, 7(6): 458.
[6] Busch K W, Hennequin A, Busch M A. “Mode Formation in Optical Cavities” in Cavity Ringdown Spectroscopy Vol. 720 of the ACS Symposium Series. American Chemical Society, 1999, 34.
[7] Paldus B A, Harb C C, Spence T G, et al. Journal of Applied Physics, 1998, 83(8): 3991.
[8] Brown L R, Sung K, Devi V M, et al. Journal of Quantitative Spectroscopy & Radiative Transfer, 2013, 130(11): 201.
[9] Rothman L S，Gordon I E, Barbe A, et al. J. Quant. Spectrosc. Radiat. Transfer，2009, 110：533.
[10] Kachanov A，Tan S, Paldus B. Picarro, 2007, 272(1): 64.
[11] SUN Li-qin, CHEN Bing, KAN Rui-feng, et al(孙丽琴, 陈 兵, 阚瑞峰，等). Acta Optica Sinica(光学学报), 2015, 35(9): 0930002.
[12] LI Chun-guang, DONG Lei, WANG Yi-ding, et al(李春光, 董 磊, 王一丁，等). Optical Precision Engineering(光学精密工程), 2018, 26(8): 1855. |
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