用于光学像移补偿的红外望远光学系统

An optical system of infrared telescope used for optically compensation of image motion

为提高搜索效率和目标探测概率,红外搜索警戒系统越来越多地采用了焦平面成像器件.工作时必须保证成像器件具有一定的积分时间,才能达到要求的信噪比,为此必须采取像移补偿措施。常用的光学式像移补偿利用位于望远光学系统后面反射镜的反向摆动,使场景的光学图像在积分时间内与焦平面成像器件相对静止,以消除平台在连续转动过程中产生的像移或拖尾。本文给出了一种像方视场角与物方视场角具有线性关系的红外望远光学系统,系统工作波段为7.7~10.3μm,放大率为10×.该系统可用于采用焦平面探测器的搜索警戒装置,通过像移补偿反射镜或透射平板的摆动补偿平台转动时产生的像移,计算表明全视场范围内的残留像移不大于1μm。

In order to increase the searching efficiency and detection probability,more and more Focal Plane Detectors are used in infrared searing or surveillance systems.The optical image must be static to detector for a period of time to reach the demand ratio of signal to noise,therefore a compensation for image motion must be applied.The optical compensation which is commonly used exploit a wiggling mirror or transparent plane after a telescope to compensate the imaging motion generated by platform rotation.An optical system of infrared telescope that the image field of view correlated linearly with the objective field of view is described in this paper,and the wave band of the optical system is 7.7~10.3μm with magnification of 10×.The telescope can be used in infrared searching system,where a wiggling mirror or transparent plane is used for compensating the imaging motion generated by platform rotation.The calculating results show that the residual image motion is less than 1μm in the whole field of view.