提出了一种三次成像红外两档变焦面阵扫描光学系统，在传统红外二次成像光学的基础上，增加了两档变焦的前置望远系统，通过变焦组单一组元沿光轴方向移动，来实现两档焦距切换。变焦组沿光轴方向的微调，可实现不同工作温度的补偿与不同物距的清晰成像。在中间平行光路中，引入振镜，通过振镜以特定频率进行相应角度范围的往返扫描，来补偿由于扫描平台转动带来的曝光时间内的物面的移动，保持系统在旋转扫描时成像清晰与稳定，没有拖影。系统结构紧凑，可实用于两档变焦搜索与跟踪一体的红外系统中。

A two-stage zoom array detector scanning infrared optical system was proposed. On the basis of traditional infrared secondary imaging optics, a two-stage zoom front telescope system was added to realize two-stage zoom by moving the zoom group along the optical axis. The zoom group adjusted the distance along the optical axis, and realized the compensation of different working temperature and different object distances. In the middle parallel light path, a galvanometer was introduced, and the galvanometer was used to scan back in the corresponding angle range at a specific frequency, which could compensate for the object movement during the exposure time caused by the rotation of the scanning platform, and keep the image clear and stable during the rotation scanning without any shadow. The system is very compact, and can be widely used in the infrared searching and tracking system.