optically flat filter
... double - beam spectrodensitometer双光束分光光密度计 optically flat filter光平面滤光片;光学扁平滤光器;光学平面滤光片 optical antenna光学[光波段]天线 ...
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利用四路红外非制冷焦平面探测器、大视场光学系统、窄带滤光片和信号处理系统，构成了凝视成像激光探测与告警系统。
A staring imaging laser detecting and warning system is formed by using 4-channel uncooled infrared focal plane detectors, large field optical system, narrow band filters and signal processing system.
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