详述了适用于3~5μm波段、长入瞳距多目标复合的投影光学系统设计。系统实现了干扰和目标发生器共用一个投影光学系统, 入瞳距大于2000mm。原理上采用目标系统、干扰系统、主投影系统分开设计, 并在主投影系统焦平面上放置中间像面实现目标和干扰的复合。给出了最后的设计结果, 包括点列图、调制传递函数曲线。入瞳距2050mm, 入瞳口径Φ75mm, 视场±2°。

Infrared collimating optical system is a key component of hardware-in-loop simulation system. The collimating optical systems for multi-targets compounded simulation with large entrance pupil distance which work at 2～5μm are designed. In order to make the interference and target generator share the same optical system with a entrance pupil distance larger than 2000mm, the target system, the interference system and the main projection system are designed singly. In addition, ground glass surface is put in the focal surface of the main projection system to ensure the interference and target signal compounded together. The final designed optical systems are given including spot diagrams and MTF, whose performances meet the design requirements. The system with an entrance pupil distance of 2050mm, a entrance pupil diameter of 75mm and a field of view ±2° is established.