针对光电系统视场切换问题，提出柔性切换方案，提高视场切换的速度与精度。根据某光电跟踪装置对光电成像系统小型化、轻型化的要求，设计了双视场一体化同轴、共像面光学系统，利用偏振片的起偏原理，将大小2个视场的光学系统分为俯仰偏振和偏航偏振2个光学通道，再利用液晶旋光(0°，90°两位置)效应和偏振片检偏原理，对俯仰偏振和偏航偏振2个光学通道进行分时选通(即柔性切换)。测试表明，2个光学通道的(柔性)切换时间只有几个毫秒，是机械式切换的1%左右。实验验证双视场柔性切换成像系统技术方案可行，能满足某光电跟踪系统的要求。

Aiming at the visual field change-over of electro-optical system, a flexibility change-over method was presented to improve the accuracy and speed of the visual field change-over. The double visual field integrated coaxial and total imaging surface optical system was designed to meet the requirements of miniaturization and light-weight for the electro-optical imaging system of a certain electro-optical tracing device. Using the polarization principle of polarizer, the electro-optical systems of these two large and small visual field were divided into two optical channels of pitching polarization and yawing polarization. Using the liquid crystal rotator (two positions of 0°,90°) and the polarize principle of polarizer, time-sharing (flexibility change-over) gating of these two optical channels of pitching polarize and yawing polarize was carried out. The test result shows that the (flexibility) change-over time of these two optical channel is milliseconds only, which is 1% of the mechanical change-over. The double visual field flexibility change-over imaging system technical solution is feasible, and can meet the requirement of the certain electro-optical tracing system.