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Chinese Optics Letters, Volume. 16, Issue 10, 103001(2018)

Qualitative and quantitative analysis of atmospheric methanol using a continuous-wave terahertz spectrometer

Han Zhang1,2, Zhaohui Zhang2,3、*, Xiaoyan Zhao3, Xiaotong Zhang1, Tianyao Zhang3, Can Cao3, and Yang Yu3
Author Affiliations
  • 1School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2Beijing Engineering Research Center of Industrial Spectrum Imaging, Beijing 100083, China
  • 3School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China
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    Figures&Tables (8)
    Equations (3)
    References (13)
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    Figures & Tables(8)
    Schematic diagram of THz-FDS system for gas detection.

    Fig. 1. Schematic diagram of THz-FDS system for gas detection.

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    Dynamic range of scanning THz signal of air (dashed line) and vacant gas cell (solid line).

    Fig. 2. Dynamic range of scanning THz signal of air (dashed line) and vacant gas cell (solid line).

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    Averaged amplitude of THz electric field signal of methanol sample (bottom) and reference (top).

    Fig. 3. Averaged amplitude of THz electric field signal of methanol sample (bottom) and reference (top).

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    Calculated absorption cross section (bottom) from 100 to 1090 GHz compared with the experimental absorbance (top).

    Fig. 4. Calculated absorption cross section (bottom) from 100 to 1090 GHz compared with the experimental absorbance (top).

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    The linear regression on the absorption peaks of methanol.

    Fig. 5. The linear regression on the absorption peaks of methanol.

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    Three frequency sub-bands of absorbance spectra of nine samples with gradually reduced methanol vapor.

    Fig. 6. Three frequency sub-bands of absorbance spectra of nine samples with gradually reduced methanol vapor.

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    Relative standard deviation (RSD) of THz signal for vacant chamber.

    Fig. 7. Relative standard deviation (RSD) of THz signal for vacant chamber.

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    • Table 1. Linear Regression Results and Correctness of Fitting

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      Table 1. Linear Regression Results and Correctness of Fitting

      Sample No.Concentration (molecule/cm3)Adjusted R2 CoefficientRMSE
      12.348×10180.99260.09824
      22.061×10180.99390.07799
      31.793×10180.96780.15790
      41.488×10180.98910.07557
      51.245×10180.98590.07203
      67.186×10170.91650.10430
      78.854×10170.89430.14610
      84.283×10170.66420.14280
      93.922×10170.85040.07868
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    Han Zhang, Zhaohui Zhang, Xiaoyan Zhao, Xiaotong Zhang, Tianyao Zhang, Can Cao, Yang Yu, "Qualitative and quantitative analysis of atmospheric methanol using a continuous-wave terahertz spectrometer," Chin. Opt. Lett. 16, 103001 (2018)

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    Paper Information

    Category: Spectroscopy

    Received: Jul. 9, 2018

    Accepted: Aug. 30, 2018

    Posted: Sep. 13, 2018

    Published Online: Oct. 12, 2018

    The Author Email: Zhaohui Zhang (zhangzhaohui@ustb.edu.cn)

    DOI:10.3788/COL201816.103001

    Topics

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