针对同轴偏场三反射镜系统用Zemax软件建立了主镜分块模型, 提出了基于灵敏度矩阵反演的分块镜位置误差校正方法。对于非圆形的环扇形分块镜, 采用环扇域正交的Zernike多项式拟合出瞳波像差。仿真计算了分块镜的灵敏度矩阵, 验证了分块镜位置误差和出瞳像差变化量间的线性关系。仿真结果表明,当分块镜具有五个校正自由度时可以将光学系统恢复到设计状态, 当分块镜只有三个校正自由度时会有少量剩余误差。

A coaxial three-mirror anastigmat system with a segmented primary mirror is modeled in Zemax. A position error correction method for segmented mirror based on sensitivity matrix retrieval is proposed. For the annular-sector segmented primary mirror, the exit-pupil aberration is fitted with annular-sector Zernike orthogonal polynomials. The sensitivity matrix of segmented mirror is calculated and the linear relationship between segment position error and exit-pupil aberration variation is verified. Simulation results show that the optical system can be recovered to the design state on condition that the segment has five corrective degrees of freedom, but small residual errors will remain in three degrees of freedom correction.