基于DMD的大视场长出瞳距星模拟器光学系统设计

Design of optical system based on DMD for simulator with large field of view and long exit pupil distance

为满足高动态星模拟器的使用要求,设计了一套适用于DMD的投影光学系统和照明光学系统。投影系统采用二次成像方式,解决了大视场长出瞳距情况下长后工作距和系统像差校正难的问题,采用复眼透镜阵列设计了相应的照明系统,利用全反射棱镜实现照明系统和投影系统的同向排列。设计结果表明:系统出瞳为60 mm,视场为28.6°,畸变小于0.045%,80%的能量集中在直径为8μm的圆内,照明系统的照明均匀度大于94%,满足设计指标要求,适用于大视场长出瞳距DMD型动态星模拟器的光学系统。

In order to meet the requirements of the high dynamic star simulator,a set of projection optical system and illumination optical system suitable for digital micromirror device(DMD)was designed.The secondary imaging method was adopted by the projection optical system,which solved the problem that it was difficult to achieve long working distance and system aberrations alignment in the case of large field of view and long exit pupil distance.The compound eye lens array was used to design the corresponding illumination optical system,and the approximately coaxial arrangement of the illumination system and projection system was realized by using a total reflection prism.The design results show that the optical system has a 60 mm exit pupil distance and a 28.6°field of view,the distortion is less than 0.045%and the 80%of the energy is concentrated in the circle with a diameter of 8μm,the illumination uniformity of the illumination system is greater than 94%,which meet the design index requirements,and is suitable for the optical system of DMD dynamic star simulator with large field of view and long exit pupil distance.