中文摘要：

为了满足同步观测、跟踪,同时探测红外中/长波两个波段信息的目标,文中采用共口径方式将红外中/长双波段融合到同一个光路中,设计了一款非制冷型大变倍比红外双波段连续变焦光学系统,引入衍射面和偶次非球面,进行像差校正,选择机械负组补偿方式进行变焦.通过光学被动式消热差方式,匹配材料及分配透镜光焦度,对双波段红外光学系统在-40~＋60℃温度范围内进行了消热差设计,并对系统的像质进行了分析.研究结果表明：在不同温度,系统在两个波段下,各个视场内调制传递函数在奈奎斯特频率为20lp·mm~（-1）处均接近衍射极限,系统整体无温度离焦,像面稳定,像质良好,结构紧凑,满足使用要求.

英文摘要：

In order to fulfill the requirements of synchronous observation and coincident tracking target,and identify the information of two bands of the mid-infrared light and the long-infrared light,a large zoom ratio uncooled infrared dual-band continuous-zoom optical system is designed,using an optical system with an aperture shared by mid-infrared light and long-infrared light.The aberration corrected,by introducing the reflecting surface and non-spherical surface,and using machinery compensation mode in zooming.According to the requirements,the optical passive compensation method of matching optical materials and distributing optical power of each lens elements is used to realize an athermalized design in the temperature of -40 to ＋60 ℃.The image quality of infrared objective is analyzed.The result indicates that the modulation transfer function of all field of optical system is close to the diffraction limit,in two bands and different temperature.The whole system has an excellent image quality,compact structure and a stable image surface,which meet the application requirements.