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采用光路展开法,利用调制度与相位误差两种判据,分析平行转镜在转动过程中的晃动、平行转镜的平行度、定镜的倾斜误差以及视场角等因素对平行转镜式光谱仪误差容限的影响.分析表明:平行转镜的晃动是平行转镜式光谱仪最重要的影响因素,但由于平行转镜的连续快速转动,惯性的作用会显著降低转动过程中的晃动影响;系统对平行转镜的平行度不敏感,对定镜的倾斜与视场角的误差容限与传统迈克尔逊式光谱仪相同.相对于传统直线往复运动式的光谱仪,平行转镜式光谱仪具有更高的探测速度与稳定性.同时,误差容限分析也为该光谱仪的系统设计与装调提供了理论指导.
By using the method of light path expansion, the criteria of modulation degree and phase error are used to analyze the factors such as the wobbling of the parallel rotating mirror in the rotating process, the parallelism of the parallel rotating mirror, the tilt error of the fixed mirror and the angle of view, The error tolerance of the spectrometer is analyzed.The results show that the parallel oscillating mirror is the most important influencing factor of the parallel rotating mirror spectrometer, but due to the continuous rapid rotation of the parallel rotating mirror, the inertia can significantly reduce the influence of the shaking during the rotating process. The system is insensitive to the parallelism of the parallel rotating mirrors and has the same margin of error as the conventional Michelson spectrometer for the tilt and field angle of the fixed mirror. Compared to the conventional linear reciprocating spectrometer, the parallel rotating mirror spectrometer has a higher Of the detection speed and stability.At the same time, the error margin analysis also provides theoretical guidance for the system design and installation of the spectrometer.