发明名称 |
Rotary encoding device using polygonal mirror with diffraction gratings on each facet |
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 each have a 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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申请公布号 |
US5266796(A) |
申请公布日期 |
1993.11.30 |
申请号 |
US19920971035 |
申请日期 |
1992.11.03 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION |
发明人 |
LEVITON, DOUGLAS B. |
分类号 |
G01D5/38;(IPC1-7):G01D5/34 |
主分类号 |
G01D5/38 |
代理机构 |
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地址 |
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