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摘要: 针对同轴两反射镜光学成像视场角受限、大视场角下成像对比度较低的问题，采用透镜组作为像差校正组，合理分配光学系统的光焦度及间距，来扩大两反射结构的成像视场角，提升相机全视场内的成像质量。以某一工程应用需要为例，设计并研制了焦距为750 mm、视场角2ω=3.45°、全视场平均传递函数在108 lp/mm处优于0.2的相机光学系统，且在未使用主镜筒外遮光罩的前提下，优化设计了次镜遮光罩以实现杂散光抑制。采用TracePro软件进行相机杂散光环境建模仿真，结果表明：在非成像视场角内的杂散光点源透过率（PST）的量值范围为10−3~10−6。系统满足传统地面目标探测成像要求，验证了紧凑型大视场折反射光学杂散光抑制结构的可行性，并为商用同轴折反射光学系统设计及优化提供了一定的参考。
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关键词:
- 光学设计 /
- 折反射 /
- 杂散光抑制 /
- 点源透过率（PST）
Abstract: A lens group is used as an aberration correction group to solve the limited field of view angle and low imaging contrast at a large field of view in the coaxial two-mirror optical system. The lens group adopts reasonable optical power and pitch, it expands the field of view of two-reflection mirrors and improves imaging quality in the camera's full field of view. Taking an engineering application as an example, we design and develop an optical system with a 750 mm focal length, a field of view of 2ω=3.45°, an average transfer function better than 0.2 at 108 lp/mm, and an optimized design for its secondary mirror hood that suppresses stray light without a main mirror barrel hood. Simulation stray light was optimized by using TracePro software. The results show that the stray light Point Source Transmittance (PST) in the non-imaging field of view ranges from 10−3 to 10−6. The system meets the requirements for traditional ground target detection and imaging, the feasibility of a compact large-field refracting optical stray light suppression structure is verified, and a certain reference for the design and optimization of commercial coaxial refracting optical systems is provided. -
图 4 全视场（21×21）采样下的系统出射波前RMS
Figure 4. System wavefront RMS of 21×21 typical field of view
图 6 焦平面的照度曲线及仿真成像效果图
Figure 6. Illumination curve of focal plane and simulation imaging effect
图 11 俯仰方向和水平方向的PST曲线
Figure 11. PST curves of system in pitch and horizontal directions
表 1 光学系统设计参数
Table 1. Design parameters of optical system
光学参数 数值 焦距/mm 750 视场角2ω/(°) 3.45 像方F数 10 工作波段/nm 420~700 畸变 <1% 探测器像元 8 K×6 K@4.65 μm×4.65 μm 相对照度 ≥95% 体积/mm ≤$\varnothing $95×200 
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