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Chinese Journal of Lasers, Volume. 46, Issue 12, 1211001(2019)

Measurement of Carbon Isotope of Methane and Analysis of Its Genesis Type Using Laser Absorption Spectroscopy

Zhirong Zhang1,2,3、**, Tao Pang1、*, Pengshuai Sun1, Hua Xia1, Zhe Li1,3, Runqing Yu1,3, Xiaojuan Cui1, and Shu Chimin4
Author Affiliations
  • 1Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Hefei, Anhui 230031, China
  • 2Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Hefei, Anhui 230031, China;
  • 3School of Environment Science and Optoelectronic Technology, University of Science and Technology of China,Hefei, Anhui 230061, China
  • 4Department of Safety Health and Environmental Engineering, Taiwan Yunlin University of Science and Technology,Yunlin, Taiwan 64002, China
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    Schematic of Beer-lambert law. (a) Gas absorption diagram; (b) signal diagram after gas absorption

    Fig. 1. Schematic of Beer-lambert law. (a) Gas absorption diagram; (b) signal diagram after gas absorption

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    Spectral line intensities of methane carbon isotope at different wavelengths in HITRAN database. (a) 13CH4; (b) 12CH4

    Fig. 2. Spectral line intensities of methane carbon isotope at different wavelengths in HITRAN database. (a) 13CH4; (b) 12CH4

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    Results of CH4 spectral simulations at 1658 nm

    Fig. 3. Results of CH4 spectral simulations at 1658 nm

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    Schematic of experimental setup

    Fig. 4. Schematic of experimental setup

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    Flow chart of control process and fuzzy adaptive PID closed-cycle control algorithm

    Fig. 5. Flow chart of control process and fuzzy adaptive PID closed-cycle control algorithm

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    Photo of test-field equipment (right photo shows sampling rubber balls)

    Fig. 6. Photo of test-field equipment (right photo shows sampling rubber balls)

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    Signal spectra of methane isotopic gas samples using proposed system. (a) Direct-absorption signals; (b) second harmonic signals(2f)

    Fig. 7. Signal spectra of methane isotopic gas samples using proposed system. (a) Direct-absorption signals; (b) second harmonic signals(2f)

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    Measurement distribution values of methane concentration and carbon isotopic abundance of coal mine samples. Dotted square line stands for distribution values of methane concentrations at different sampling positions of coal mine; dotted star line stands for distribution values of methane carbon isotope abundances at different sampling positions of coal mine

    Fig. 8. Measurement distribution values of methane concentration and carbon isotopic abundance of coal mine samples. Dotted square line stands for distribution values of methane concentrations at different sampling positions of coal mine; dotted star line stands for distribution values of methane carbon isotope abundances at different sampling positions of coal mine

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    • Table 1. Selected spectral data of methane in 1658.4-1659.6 nm

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      Table 1. Selected spectral data of methane in 1658.4-1659.6 nm

      MoleculeWavelength /nmWavenumber /cm-1Intensity /(cm·molecule-1)Elow /cm-1
      1658.629866029.072687.794×10-2262.8787
      13CH41658.625356029.089087.802×10-2262.8797
      1658.620186029.107871.283×10-2162.8811
      12CH41658.772646028.553732.692×10-23104.7728

    • Table 2. List of sampling positions

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      Table 2. List of sampling positions

      NumberSampling positionNumberSampling position
      SM-15# U-type borehole height in 912 air waySM-64# fire prevention observation points in 7133 air way
      SM-2Bedding hole in 912 air waySM-750 groups of 1# holes in 1# extraction way of east-wing of No. 3 mining area
      SM-31#-1 fire prevention observation points in 7135 retain roadwaysSM-842 groups of 1# holes in 1# extraction way of east-wing of No. 3 mining area
      SM-41#-2 fire prevention observation points in 7135 retain roadwaysSM-943 groups of 1 # holes in 2# extraction way of east-wing of No. 3 mining area
      SM-536# bedding hole in west 7135 air waySM-1035 groups of 1# holes in 2# extraction way of east-wing of No. 3 mining area
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    Zhirong Zhang, Tao Pang, Pengshuai Sun, Hua Xia, Zhe Li, Runqing Yu, Xiaojuan Cui, Shu Chimin. Measurement of Carbon Isotope of Methane and Analysis of Its Genesis Type Using Laser Absorption Spectroscopy[J]. Chinese Journal of Lasers, 2019, 46(12): 1211001

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    Paper Information

    Category: spectroscopy

    Received: Jun. 6, 2019

    Accepted: Aug. 13, 2019

    Published Online: Dec. 2, 2019

    The Author Email: Zhang Zhirong (zhangzr@aiofm.ac.cn), Pang Tao (bumianren123@aiofm.ac.cn)

    DOI:10.3788/CJL201946.1211001

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology