Error analysis and correction of scale tape grating encoder
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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10 m、 加工椭圆度为2 m、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。Abstract:To satisfy rigid performance specifications of goniometry for a telescope, this paper analyzes the impacts 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 experiments are performed on a experimental platform with a mechanical installation eccentric of 10 m, roundness error of 2 m and shafting sloshing of 0.6. The measuring angle error RMS values from two sets of experiments 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 shafting sloshing. It achieves arcsecond angle measurements.
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Key words:
- telescope/
- encoder/
- scale tape grating/
- angle measurement/
- error analysis
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[1] MANCINI D,CASCONE E,SCHIPANIL P. Galileo high-resolution encoder system[J].SPIE,1997,3112:328-334. [2] RAVENSBERGEN M,MERINO R,WANG C P. Encoders for the altitude and azimuth axes of the VLT[J].SPIE,1995,2479:322-328. [3] WARNER M,KRABBENDAM V,SCHUMACHER G. Adaptive periodic error correction for heidenhain tape encoders[J].SPIE,2008,7012:123-131. [4] CALLAHAN S,ASHBY D,HAIR T,et al.. The large binocular telescope main axis encoders:mounting hardware, read heads, and tape installation[J].SPIE,2006,6267:62673B. [5] ASHBY D S,SARGENT T,COX D. The Large Binocular Telescope azimuth and elevation encoder system[J].SPIE,2008,7019:201-210. [6] FISHER M. A high resolution incremental tape encoder on the William Herschel Telescope[J].SPIE,1994,2199:889-900. [7] 张玉莲.传感器与自动检测技术 [M].2版.北京:机械工业出版社,2012:80-81. ZHANG Y L.Sensor with Automatic Detection Technology[M]. 2nd ed. Beijing:China Machine Press,2012:80-81.(in Chinese) [8] 王明佳,武治国,徐大鹏,等. 精确自动识别莫尔条纹方向的算法[J]. 中国光学,2011,4(5):509-513. WANG M J,WU ZH G,XU D P,et al.. Accurate and automatic recognition of Moire fringe angle[J].Chinese Optics,2011,4(5):509-513.(in Chinese) [9] Heidenhain Product introduction: angle encoder [EB/OL].[2013-04-07].http:[C]//www.heidenhain.com.cn. [10] 徐晓丹. 增量式光电编码器细分技术研究[D].长春:长春理工大学,2009. XU X D. Research of electronic subdivision of incremental shaft encoder [D]. Changchun:Changchun University of Science and Technology,2009. [11] 熊文卓,孔智勇,张炜. 光电轴角编码器光电信号正交性偏差的相量校正方法[J]. 光学 精密工程,2007,15(11):1746-1748. XIONG W ZH,KONG ZH Y,ZHANG W. Phase correction of quartering deviation of photoelectric rotary encoder[J].Opt. Precision Eng.,2007,15(11):1746-1748(in Chinese). [12] 吕孟军,郭琪,吕印晓. 莫尔条纹信号相位误差补偿[J]. 光学 精密工程,2009,17(7):1694-1700. LV M J,GUO Q,LV Y X. Signal phase error compensation of Moire fringe[J].Opt. Precision Eng.,2009,17(7):1694-1700.(in Chinese) [13] 楚兴春,吕海宝,杜列波,等. 任意相位差条纹信号细分方法的研究[J]. 光学学报,2005,25(4):497-500. CHU X CH,LV H B,DU L B,et al.. Research on subdividing method for random phase difference fringe signals[J].Acta Optica Sinica,2005,25(4):497-500.(in Chinese) [14] 李江国,宣明,王一凡. 莫尔条纹细分中相位误差的软件补偿方法[J]. 光学 精密工程,1995,3(1):69-72. LI J G,XUAN M,WANG Y F. Soft ware compensation method of phase error in moire strip division[J].Opt. Precision Eng.,1995,3(1):69-72.(in Chinese) [15] 邓立新,杨建坤,戴穗安,等. 莫尔条纹技术的三维测角方法研究[J]. 光学与光电技术,2010,8(3):39-41. DENG L X,YANG J K,DAI S A,et al.. 3-Dimensional angular measurement method based on moire fringe[J].Optics&Optoelectronic Technology,2010,8(3):39-41.(in Chinese)
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