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High angular sensitivity, absolute rotary encoding device with polygonal mirror and stand-alone diffraction gratings
High angular sensitivity, absolute rotary encoding device with polygonal mirror and stand-alone diffraction gratings
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机译:高角度灵敏度,带有多面镜和独立衍射光栅的绝对旋转编码设备
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摘要
A device for position encoding of a rotating shaft in which a polygonal mirror having a number of facets is mounted to the shaft and a monochromatic light beam is directed towards the facets. The facets of the polygonal mirror direct the light beam to a stand-alone low line density diffraction grating to diffract the monochromatic light beam into a number of diffracted light beams such that a number of light spots are created on a linear array detector. An analog-to-digital converter is connected to the linear array detector for reading the position of the spots on the linear array detector means. A microprocessor with memory is connected to the analog-to-digital converter to hold and manipulate the data provided by the analog-to-digital converter on the position of the spots and to compute the position of the shaft based upon the data from the analog-to-digital converter.
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