大气甲烷浓度的差分吸收测量

Differential Absorption Measurements of Atmospheric Methane Concentration

  • 摘要: 该文讨论了用双He-Ne激光监测环境大气中甲烷的差分吸收方法,在实验室测量了甲烷对He-Ne激光波长的吸收系数,并且用3.3922 μm和3.3912 μm线在室外进行了甲烷浓度的测量。测量获得当地近地面自然大气中的甲烷平均浓度值为1.78 ppm,标准偏差σx=0.238 ppm。

     

    Abstract: The differential absorption method with two He-Ne lasers is discussed for the monitoring of methane in the ambient atmosphere. Absorption coefficients of methane at He-Ne laser emiting wavelengths are measured in the laboratory. By using a pair of 3.3922μm laser lines, the measurements of methane concentration are made in outdoors. The average methane concentration of 1.77ppm in the natural atmosphere near the ground is obtained

     

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