【摘要】 设计了一组制冷型红外双波段变焦系统,焦距在80～240 mm内变化,视场角1.4°～4.4°,F数为2.2。系统利用二次成像方式,达到了100%冷光阑效率,并采用共光路成像方式同时实现对中长波段的像差校正。设计结果表明:系统满足了3.7～4.8μm中波波段及7.7～10.3μm长波波段同时成像的要求。各视场MTF在17 lp/mm处均接近系统衍射极限,弥散斑均方根半径基本小于一个像元尺寸30μm,成像质量良好。通过机械补偿变焦运动方程计算和Matlab编程绘制出了变焦系统的凸轮曲线,曲线不存在断点,运动过程合理。更多还原

【Abstract】 A set of infrared dual-band three-field-of-view refrigerating zoom system was designed. The focal length was changed within 80～240 mm,the field angle was 1.4°～ 4.4°,and the F-number was 2.2. The system uses the secondary imaging method to achieve 100% cold diaphragm efficiency,and uses the common optical path imaging method to simultaneously achieve aberration correction in the middle and long wavelength bands. The design results show that the system satisfies the requirements for simultaneous imaging of 3.7～4.8 μm medium wave band and 7.7～10.3 μm long wave band.The MTF of each field of view is close to the diffraction limit of the system at 17 lp/mm. The root-mean-square radius of the diffuse spot is basically smaller than a pixel size of 30 μm,and the imaging quality is good. The cam curve of the zoom system is drawn through the calculation of the mechanically compensated zoom motion equation and Matlab programming. There is no break point in the curve,and the motion process is reasonable.更多还原