论文部分内容阅读
针对同轴偏场三反射镜系统,提出了一种宽视场波前误差检测方法。通过3个视场的波前误差检测,得到相应视场像差的Zernike多项式系数,利用该Zernike多项式系数减去设计误差后,随视场的变化为二次曲线,通过抛物线插值即可得到任一视场的Zernike多项式系数。仿真研究了Zernike多项式系数随视场的变化以及拟合精度等问题。仿真结果表明:对于原始设计误差,其Zernike系数随视场的变化需要用3次或4次曲线拟合;对于由主镜面形误差、次镜位置误差、次镜面形误差和三镜面形误差等引起的各视场波前误差,其Zernike系数随视场的变化可用直线或2次曲线拟合。通过事先存贮设计误差,仅需3个波前传感器即可实现全视场波前误差估计。Zernike系数估计误差在10-5量级。
Aiming at the coaxial three-mirror system, a wide field of view wavefront error detection method is proposed. The wavefront error of the three fields of view is used to obtain the Zernike polynomial coefficients of the corresponding field of view aberrations. After the design error is subtracted from the Zernike polynomial coefficients, the change of the field of view is a quadratic curve, which can be obtained by parabola interpolation Zernike polynomial coefficients for a field of view. Simulation studies on the Zernike polynomial coefficients with the field of view and the fitting accuracy and other issues. The simulation results show that for the original design errors, the Zernike coefficients of the original design errors need to be fitted with 3 or 4 curves with the change of the field of view. For the primary mirror error, the secondary mirror position error, the secondary mirror error and the triple mirror error Caused by the wavefront error of each field of view, the Zernike coefficient with the field changes can be linear or quadratic curve fitting. By storing design errors in advance, full-field wavefront error estimation can be achieved with just three wavefront sensors. The estimated error of the Zernike coefficient is on the order of 10-5.