| 拼接式钢带光栅编码器测角误差分析与修正 |
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| 引用本文： | 潘年,马文礼.拼接式钢带光栅编码器测角误差分析与修正[J].中国光学,2013(5):788-794. |
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| 作者姓名： | 潘年 马文礼 |
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| 作者单位： | 1. 中国科学院光电技术研究所，四川成都610209; 中国科学院大学，北京100049
2. 中国科学院光电技术研究所,四川成都,610209 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 针对望远镜对高精度测角技术的要求，分析了机械安装偏心、加工椭圆度误差、轴系晃动等对新型拼接式钢带光栅编码器测角的影响，并制定了相位差为90°的4读数头软件细分测角方案。在机械安装偏心为10μm、加工椭圆度为2μm、轴系晃动为0.6″的实验平台上进行了逆时针和顺时针测角实验，两组实验测角误差RMS值分别为0.393″和0.488″。实验表明：该测角方案能消除机械安装偏心、加工椭圆度误差等对测角数据的影响，实现了亚角秒级测角。
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| 关 键 词： | 望远镜 编码器 钢带光栅尺 角度测量 误差分析 |
Error analysis and correction of scale tape grating encoder |
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| PAN Nian
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MA Wen-li.Error analysis and correction of scale tape grating encoder[J].Chinese Optics,2013(5):788-794. |
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| Authors: | PAN Nian MA Wen-li |
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| Institution: | 1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China ; 2. University of Chinese Academy of Sciences, Beijing 100049, China) |
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| Abstract: | To satisfy rigid performance specifications of goniometry for a telescope , this paper analyzes the im-pacts of the mechanical installation eccentric , roundness error and the shafting sloshing on angle measurements by an encoder with a scale tape grating , and develops a software subdivision angle measurement program based on 4 reading heads and 90°phase difference.The counterclockwise and clockwise angle measuring experi-ments are performed on a experimental platform with a mechanical installation eccentric of 10 μm, roundness error of 2 μm and shafting sloshing of 0.6″.The measuring angle error RMS values from two sets of experi-ments are 0.393″, 0.488″, respectively.The experiments prove that the program can eliminate the angular measurement errors caused by the mechanical installation eccentric , machining roundness error and the shaft-ing sloshing.It achieves arcsecond angle measurements . |
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| Keywords: | telescope encoder scale tape grating angle measurement error analysis |
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