Noun:

1. apparatus for observation and measurement of optical phenomena

optical key光学密钥opticaladj.视觉的；光学的optical microdurometer光学显微硬度计optical driver circuit光学驱动电路Optical mirror support光学镜面支撑optically aimed weapon光学制导武器optical beam splitters光分束器Optical hard-limiter光硬限幅器optical distance meter光学测距仪optical cutting method光切割法optical PSK modulation光相移键控调制optical selection rule光学选择定则