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偏振干涉成像光谱仪中格兰-泰勒棱镜全视场角透过率的分析与计算
Analysis and calculation of Glan-Taylor prism' s transmittance at full angle of view in a polarization interference imaging spectrometer
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摘要: 论述了自行设计研制的偏振干涉成像光谱仪的工作原理,分析了其核心部件格兰.泰勒棱镜的分光机理;运用光线追迹方法,推导出了格兰-泰勒棱镜全视场角透过率计算公式;通过计算机模拟分析了入射面、入射角和空气隙厚度对该棱镜透过率的影响,并利用方解石sellmeier色散方程,给出了该棱镜在仪器系统要求的光谱范围内透过率与波长的关系曲线;实验测试结果与理论计算公式相符,验证了理论公式的正确性.Abstract: The principle of the polarization interference imaging spectrometer (PIIS) developed in our laboratory is described.The principle of the beam splitting of Glan-Taylor prism which is one of the key components in the PIIS is analyzed.Using the ray-tracing method, we obtain the transmittance of Glan-Taylor prism at full angle of view.By computer simulation, we analyze the influence of the incidence plane, incidence angle and thickness of air gap on transmittance, and the dependence of the transmittance on wavelength is given in the spectral range which is required by the instrument system using Sellmeier dispersion equation.The transmittance of Grand-Taylor prism is tested in experiment, and the results are in good agreement with the theoretical results, so the correctness of the theory is verified.
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