为了降低基于硅基液晶拼接的动态星模拟器背景杂散光, 对传统的光学引擎进行优化, 提出一种多偏振分光棱镜组合方式, 并对其光机结构进行设计.阐述了光学引擎照明系统的设计方案, 讨论了降低视场角、增强均匀性的方法.通过Tracepro对照明光学系统进行仿真, 对照明光源设计方案的可行性进行了验证.实验结果表明: 优化后的动态星模拟器杂散光辐照度降低了2.93倍.优化后的光学引擎有效地抑制了背景杂散光, 并且增强了两片反射式硅基液晶对比度的一致性.

In order to meet the requirement that the dynamics star simulators based on liquid crystal on silicon splicing reduce the stray light in the background, the traditional optical engine were optimized. A method of combining multiple polarization beam splitter into one components was proposed to optimize optical engine, and the design of the optical-mechanical structure was made. This paper expounded the design scheme of lighting system for optical engine, and we elaborated the method of reducing the field-of-view angle and increasing the uniformity. The lighting optical system was simulated by Tracepro, and the feasibility of the programme was verified. According to the results we can get that the stray light irradiance of the dynamic star simulator was reduced by 2.93 times after optimization, hence, the optimized optical engine effectively suppresses the stray light of background, and improved the consistency of the contrast ratio between the two pieces of liquid crystal on silicon.