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对传统光干涉瓦斯传感器的光路系统进行了改进,简化了光路系统,并加入了光电转换部分,使其更适合智能检测仪表的设计要求,并从波动光学理论出发,进一步推导出干涉条纹光强变化与光程差的关系式,以及气体折射率与浓度的关系。最后通过仿真计算得到了干涉条纹,验证了气体浓度与其折射率的对应关系以及气体浓度改变与固定点处光强变化的关系。
The optical system of the traditional light interference gas sensor is improved, the optical system is simplified, and the photoelectric conversion part is added to make it more suitable for the design requirements of the intelligent detection instrument. Based on the wave optics theory, the interference light intensity The relationship between the change and the optical path difference, and the relationship between the refractive index of the gas and the concentration. At last, the interference fringes were obtained by simulation. The corresponding relationship between the gas concentration and the refractive index and the relationship between the gas concentration and the light intensity at the fixed point were verified.