光学学报, 2019, 39 (9): 0922001, 网络出版: 2019-09-09
大相对孔径、大视场、紧凑型空间光学系统设计 下载: 1315次
Compact Space Optical System Design with Large Relative Aperture and Field of View
光学设计 大相对孔径 曼金反射镜 大视场 折反式光学系统 optical design large relative aperture Mangin mirror large field of view catadioptric optical system
摘要
设计了一种基于改良曼金反射镜的大相对孔径、大视场的光学成像系统,分析了改良曼金反射镜的像差,提出了改良曼金反射镜的设计方法。系统采用改良曼金反射镜和折反式光学系统结合的形式,相对孔径为1/1.8,视场角为4°×4°,工作波段为450~850 nm,焦距为380 mm,成像探测器像元为2 μm×2 μm的互补金属氧化物半导体(CMOS)探测器,在250 lp/mm Nyquist频率处的调制传递函数值接近衍射极限且大于0.5。系统次镜采用曼金反射镜和消色差透镜结合的形式,基于系统初始结构初步优化分析所得的球差、正弦差,采用PW法求解出消色差曼金反射镜的光焦度;基于消色差条件和系统剩余色差,求解出消色差曼金反射镜3个表面的光焦度,计算得到了表面的曲率半径。系统的单色像差及色差均较小,成像质量好。
Abstract
An imaging optical system with large relative aperture and field of view was designed based on a modified Mangin mirror. The aberrations of the modified Mangin mirror are analyzed and a design method is proposed for it. The optical system adopts a combination of an improved Mangin mirror and a catadioptric optical system. The relative aperture is 1/1.8, field of view is 4°× 4°, working band is 450-850 nm, and focal length is 380 mm. The imaging detector is a CMOS detector with pixel of 2 μm×2 μm. The modulation transfer function value is close to the diffraction limit and greater than 0.5 at a Nyquist frequency of 250 lp/mm. The secondary mirror of the system is designed based on a Mangin mirror and an achromatic lens. Based on the spherical aberration and sine aberration obtained from the preliminary optimization analysis of the initial system structure, the focal power of the achromatic Mangin mirror is solved by the PW method. Based on achromatic conditions and residual chromatic aberration of the system, the focal powers of three surfaces of the achromatic Mangin mirror are solved and the radii of the surfaces can be calculated. The system has small monochromatic and chromatic aberrations and good imaging quality.
任志广, 李旭阳, 倪栋伟. 大相对孔径、大视场、紧凑型空间光学系统设计[J]. 光学学报, 2019, 39(9): 0922001. Zhiguang Ren, Xuyang Li, Dongwei Ni. Compact Space Optical System Design with Large Relative Aperture and Field of View[J]. Acta Optica Sinica, 2019, 39(9): 0922001.