新型折反射式椭球形整流罩光学系统的设计

提出了一种可用于指导非旋转对称、折反射式光学系统设计的Wasserman-Wolf曲面设计方法,并将其用于设计椭球形整流罩光学系统,得到的系统具有结构尺寸小的优点。利用最小二乘拟合的方法使系统初始结构兼顾各个扫描视场的像差校正需求,克服了以往只针对零视场计算校正元件初始参数致使扩展至整个扫描视场时系统评价函数难以收敛的弊端。同时,从平面对称的矢量像差理论出发,分析了平面对称反射镜的像差特性,阐述了在不同扫描视场中,利用反射镜倾斜来进行动态像差补偿的原理。设计了一套工作波段为中波红外的椭球形整流罩光学系统,该系统的调制传递函数(MTF)在整个扫描视场内接近衍射极限。

Design of Novel Catadioptric Elliptical Dome Optical System

A design method of Wasserman-Wolf surfaces is proposed, and it can be used for non-rotationally symmetric catadioptric system. The method is used to design an elliptical dome optical system with compact structure and small volume. Least square method is used to make the initial structure of the system concern the aberration-corrected need of each scanning field. It is beneficial to overcoming the disadvantage that the system evaluation function is difficult to convergence when the entire scanning field is expanded from zero field of regard with respect to calculating and correcting the initial parameters of the components. In addition, the aberration properties of plane-symmetry mirrors with the vector aberration theory of plane symmetry are analyzed and principle by using tilt mirrors to compensate the dynamical aberration in different scanning fields is expounded. At last, a design example of mid-wave infrared elliptical dome optical system is demonstrated, and the results show that the modulation transfer function (MTF) of the optical system approaches the diffraction limit across the entire scanning field.