optical MDF光学手控测向仪opticaladj.视觉的；光学的optical flow - based基于光流Optical Scanner Reader光学扫描阅读机optical data converter光数据转换器optically thick layers光学厚层optical synchro system光学同步系统optical circuit filter光路滤光器optical color combiner光学彩色合成仪optical gain switching饱和增益开关optical density method光密度法optical bridge circuit光桥路