大口径凹椭球面反射镜光轴偏心测量方法

大口径凹椭球面反射镜光轴偏心会引起遥感相机光学系统失调，导致成像焦面与设计位置偏离。针对此问题，根据反射镜的几何参数设计了基于平晶补偿的消球差系统，通过灵敏度分析计算得到系统中平晶失调1″对系统像差无影响，主镜失调1″带来0.04λ (λ=632.8 nm)的彗差。结合仿真计算的结果，搭建测试光路，并利用经纬仪和激光跟踪仪对反射镜进行偏心测量。误差分析表明:主镜倾斜测量误差约为1.2″，主镜偏心测量误差为0.028 mm，可以满足绝大部分空间遥感相机大口径反射镜的测量需求。

Measurement of optical axis eccentricity of a large-aperture concave ellipsoid mirror

The eccentricity of the optical axis of the large-aperture concave ellipsoid mirror will cause the misalignment of the optical system of the remote sensing camera, resulting in the deviation of the imaging focal plane from the designed position. To solve this problem, an aspheric system based on optical flat compensation was designed according to the geometrical parameters of the mirror. Through sensitivity analysis and calculation, it was found that the optical flat misalignment 1" had no effect on the system aberration. The primary mirror misalignment 1″ caused a coma of 0.04λ (λ=632.8 nm). Combined with the results of simulation calculation, the test optical path was built, and the eccentricity of the mirror was measured by theodolite and laser tracker. The error analysis shows that the tilt error of the primary mirror is about 1.2″, and the eccentricity measurement error of the primary mirror is 0.028 mm, which can meet the measurement requirements of the large-aperture mirrors of most space remote sensing cameras.