A digitized ruler with absolute code is adopted as the reference of the system, and the ruler is read by the reading system which is composed of optical system, CCD camera and computer.
该系统采用绝对码标尺做基准，使用由光学系统、CCD摄像机和计算机组成的读数系统来读取标尺数值。
A digitized ruler with absolute code is adopted as the reference of the system, and the ruler is read by the reading system which is composed of optical system, CCD camera and computer.
该系统采用绝对码标尺做基准，使用由光学系统、CCD摄像机和计算机组成的读数系统来读取标尺数值。
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