近年来，随着靶场测试目标速度的提高和设备自动化程度的提高，对光电经纬仪电视跟踪伺服系统的跟踪和捕获快速运动目标的能力提出了越来越高的要求。

The high capability of O-E theodolite to track and acquire fast moving targets is required these years because of the rapid advancement of tested targets and automatization of equipments.

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码盘、光栅盘是光电位移精密测量仪器和光栅计量测试设备中的核心元件。

Code disc or grating disc is the core component of photoelectric displacement precision measuring instrument and grating measuring equipment.

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