focus scale
... focus ring 聚焦环 focus scale 聚焦标尺 focus solar collector 聚光型太阳能集热器 ...
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系统由半导体激光器、聚焦镜头、反射式标尺光栅、四裂相指示光栅和光电接收元件组成。
The article touches upon the principle of displacement measuring system consisting of diode laser focusing lens, reflecting main scale grating, quarternary index scale grating photosensor.
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