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对于光纤红外的方法检测污染气体的浓度,光谱吸收理论具有非常重要的意义。根据朗伯-比尔(Beer-Lambert)理论,首先从硫化氢(H2S)气体浓度的定量分析以及分子参数的理论进行研究,再通过分析该气体的吸收线得出该气体的吸收系数α(ν)的一般方法。并得到,在气体压强小于0.03个标准大气压(atm,1atm=1.01325×105Pa)时用高斯(Gaussian)线型拟合,大于2atm时用洛伦兹(Lorentzian)线型拟合,它们的相对误差都控制在小于0.1的范围之内。压强在0.03—2atm之间时,吸收线型用福赫特(Voigt)线型拟合比较好,理论上得到很好的结果。
The theory of spectral absorption is of great importance for the detection of contaminated gas concentrations by the optical fiber infrared method. According to the Beer-Lambert theory, the quantitative analysis of hydrogen sulfide (H2S) gas concentration and the theory of molecular parameters are first studied. The absorption coefficient α (ν ) The general method. And obtained with Gaussian line fitting at gas pressures less than 0.03 atm (atm, 1 atm = 1.01325x105 Pa) and Lorentzian line fitting at more than 2 atm with their relative errors Are controlled within the range of less than 0.1. At pressures between 0.03 and 2 atm, the absorption line type is better fitted with the Voigt line type, which gives theoretically good results.