基于战场环境要求的红外光学系统具有高成像质量、超轻小型化和高温度适应性的特点，针对联合变换相关器对坦克目标进行实时探测跟踪的要求，设计了一种结构紧凑、重量轻、成像质量好和环境适应性强的红外无热化摄远型物镜。针对坦克最大作战距离3km，确定了光学系统的技术参数: f=200mm，F=3，2ω=3.056°，波段8～12μm。比较了当前三种无热技术的优缺点，采用光学被动式方法。设计结果满足在-40～70℃范围内，系统的调制传递函数接近衍射极限。该摄远物镜可用于坦克观瞄镜，满足坦克目标跟踪识别的实际应用要求。

Based on the requirements of good image quality, miniaturized dimension and high-temperature adapatability on infrared optical system applied in the battle field environment, and in order to realize real-time detecting and tracking on tank targets by joint transform correlator, an athermalized infrared telephoto objective with the features of compact structure, light weight, good image quality and environmental adaptability was designed. According to the biggest battle distance of tanks for 3km, the parameters of the optical system were defined as: f=200mm,F=3,2ω=3.056°, and its working wavelength was set as 8～12μm. Based on the comparison of current three athermal technologies, passive optical athermalization design was applied for the infrared optical system. It is proved that the modulation transfer function can approach the diffraction limit in the temperature range of -40～70℃. The telephoto objective can be used for tank sight, and it meets practical application requirements of tracking and recognition for tank targets.