基于曼彻斯特编码的图像式角位移测量系统

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关键词：曼彻斯特;图像式；角位移测量;边沿定位；亚像素中图分类号：TP212.9 文献标志码：A doi：10.37188/CO.2024-0178 CSTR：32171.14.CO.2024-0178

Abstract： In comparison with traditional photoelectric displacement measurement technologies， displacement measurement methods based on digital image processng exhibit superior fault tolerance and flexibility， making them a current research hotspot.To achieve high-precision and high-reliability angular displacement measurement， an image-based angular displacement measurement system based on Manchester coding was proposed. First， a single code-channel raster code disc was designed using Manchester coding based on M-sequence pseudo-random coding. A digital image sensor was then used to construct an optical path for capturing paterns on the raster code disc.Subsequently，a decoding recognition algorithm tailored to the coded patterns was developed.Additionally，edge positioning and sub-pixel subdivision algorithms for coded marker edge pattern fiting were proposed to further enhance the system's resolution. The proposed method was then experimentally validated. The experimental results demonstrated that the system achieved a resolving power of 21 bits and an accuracy of 1.73 arcseconds with a 100mm grating code disc. This research provides a foundation for the development of highly reliable and high-performance photoelectric angular displacement measurement technologies.

Key words： Manchester; graphical; angular displacement measurement; edge positioning; subpixel

1引言

光栅位移测量技术是一种集光学、机械和电子于一体的高精度数字化位移测量技术。（剩余12175字）