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根据甲烷气体的吸收光谱设计了井下甲烷实时检测系统。在分析甲烷气体对应的特征光谱吸收波长的基础上,采用静态傅里叶变换干涉具和线阵CCD探测器,在对干涉条纹进行傅里叶变换后得到光谱信息,从而求出各波长上的光强衰减量。通过仿真实验,计算了瓦斯浓度关于光源光强、出射光强的函数关系,选择了10mW的激光器。根据比尔-朗伯定理及浓度程长积公式,给出了甲烷浓度的表达式,检测系统的最小探测浓度为0.02%,可满足井下甲烷浓度0%～5%的范围及0.10%的精度要求。实验证明,采用傅里叶变换光谱分析法求解甲烷浓度可达到井下实时监测的要求。
According to the absorption spectrum of methane gas, a downhole methane real-time detection system is designed. Based on the analysis of the absorption wavelength of the characteristic spectrum corresponding to the methane gas, a static Fourier transform interferometer and a linear array CCD detector are used to obtain the spectral information after the Fourier transform of the interference fringes to obtain the spectral information Light attenuation. Through the simulation experiment, the function of gas concentration as a function of the light intensity and the light intensity of the light source is calculated, and the 10mW laser is selected. The expression of methane concentration is given according to the Beer-Lambert theorem and the concentration-length long product formula. The minimum detection concentration of the detection system is 0.02%, which can meet the range of 0% ~ 5% methane concentration and 0.10% accuracy requirement. Experiments show that the use of Fourier transform spectroscopy to solve the concentration of methane can be achieved real-time monitoring of the underground requirements.