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.
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。
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Two stratigraphic units belonging to Cenozoic Group have. been found between the Permian System and the Quarternary Loess from Xiangshan hill terrain in Hancheng Mining Area.