为实现岸用光电装备大视场搜索目标, 小视场观察目标的监视目的, 通过对变焦光学系统设计模型及其理论参数的研究分析, 选用光学补偿法四组元变焦光学结构型式, 提出一种折衍混合两档变焦的岸用监视红外光学系统。调整初始结构并经ZEMAX软件进行优化, 设计出一款焦距150~300 mm, 口径100 mm的两档变焦红外光学系统, 在空间频率30 lp/mm处, 调制传递函数(MTF)达到0.6, 全视场弥散斑半径(RMS)控制在25 μm以内, 在[-30 ℃~+50 ℃]工作温度范围内实现非热敏化。该系统结构简单, 通过使用非球面和衍射面将镜片数量减少至5片, 设计结果满足各项任务指标, 对岸用监视红外光学系统的进一步研制具有重要意义。

In order to realize target searching of large field of view and target observation of small field of view of coastal photoelectric equipments, based on the research and analysis of the zoom optical system design model and theory parameters, four zoom optical structure of optical compensation method is chosen, and a coastal surveillance infrared optical system of hybrid refractive-diffractive two zoom is proposed. After adjusting the initial structure and optimizing with ZEMAX software, a two zoom infrared optical system is designed, which has 150~300 mm focal length, 100 mm diameter. At the space frequency of 30 lp/mm, the modulation transfer function (MTF) reaches 0.6, the speckle in the full field of view is controlled within 25 μm, and the non-thermal sensitization is realized within the working temperature range of -30℃~+50℃. The system is simple in structure, and the number of lenses is reduced to 5 by using aspheric surface and diffraction surface, and the design results meet various task indexes. It is important to the development of coastal infrared surveillance optical system.