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.

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该方法基于共轴球面光学系统的成像原理，通过读数显微镜对吸入待测液体后毛细管的焦点位置进行单一参数的测量，进而计算出待测液体的折射率。

The refractive index was obtained through measuring the focal position of a capillary filled with the liquid by a reading microscope, and doing a calculation with an analytic formula.

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DVD光学读数头是新一代的高密度光盘系统的核心部件。

Optical pick-up is the cut-in point of DVD system.

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