四读头法消除码盘偏心和振动对叠栅条纹相位测量的影响
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摘要
光栅编码器装调的偏心误差和使用中安装转轴的振动严重影响光栅编码器的测量精度,限制了光栅码盘的应用范围。为了消除光栅编码器偏心与振动对测量的影响,在双读头法的基础上,提出了四读头法消除光栅编码器偏心和振动影响的方法,并进行了理论推导和仿真。结果表明,采用沿光栅编码器圆周均匀分布的四读头读取叠栅条纹信号,并将检测相位相加除以4的方法比当前普遍采用的对径读头读数相加除以2的方法更能有效地提高光栅编码器的测量精度,从而降低了光栅编码器的装调要求。利用四读头各自采集的测量信号可以解算出偏心方向和偏心量,从而可以消除安装转轴振动的影响。对光栅编码器的进一步应用研究具有指导意义。
Presently,grating encoder is an important way to accurately measure angle,however,the eccentric inaccuracy of assembling adjusting and the vibration of rotating shaft influence grating encoder's measuring accuracy and then confine the application range of grating encoder.A new method to eliminate the influence of eccentricity and vibration with four reading heads is proposed and the theoretical derivation and simulation results are given out.The conclusion hints that the method which gets moiré fringes signal by four reading heads well-distributed along the circumference of grating is more effective in improving the measuring accuracy than the one that uses double reading heads.Consequently,the new method decreases the requirements of assembling adjusting.The direction and magnitude also can be solved by four reading heads,so the influence of rotating shaft can be eliminated.All the results are useful to deeper research.
Presently,grating encoder is an important way to accurately measure angle,however,the eccentric inaccuracy of assembling adjusting and the vibration of rotating shaft influence grating encoder's measuring accuracy and then confine the application range of grating encoder.A new method to eliminate the influence of eccentricity and vibration with four reading heads is proposed and the theoretical derivation and simulation results are given out.The conclusion hints that the method which gets moiré fringes signal by four reading heads well-distributed along the circumference of grating is more effective in improving the measuring accuracy than the one that uses double reading heads.Consequently,the new method decreases the requirements of assembling adjusting.The direction and magnitude also can be solved by four reading heads,so the influence of rotating shaft can be eliminated.All the results are useful to deeper research.
引文
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11Yang Guoguang.Modern Optical Testing Technology[M].Hangzhou:Zhejiang University Press,2005.272～277杨国光.近代光学检测系统[M].杭州:浙江大学出版社,2005.272～277
2Wang Duqiao,Liu Yong,Zhou Gang et al..The analysis andresearch of four fold-frequency method based on incrementalphotoelectrical encoder pulse[J].Marine Electric&ElectronicEngineering,2009,29(8):14～17王度桥,刘勇,周岗等.光电码盘脉冲信号四倍频检测方法的分析与研究[J].船电技术,2009,29(8):14～17
3Zhao Yong,Su Xianyu,Li Wen.Phase subdivision of absolutecoding grating[J].J.Optoelectronics.Laser,2010,21(1):91～95赵勇,苏显渝,李雯.绝对编码光栅的相位细分[J].光电子.激光,2010,21(1):91～95
4Zhou Shaolin,Yang Yong,Chen Wangfu et al..Dual-grating-based nanometer measurement[J].Acta Optica Sinica,2009,29(3):702～706周绍林,杨勇,陈旺富等.基于双光栅的纳米测量方法[J].光学学报,2009,29(3):702～706
5Zong Ze,Xing Hongyan.A novel double-grating-based horizontalgeophone[J].Acta Optica Sinica,2010,30(9):2493～2503宗泽,行鸿彦.新型双光栅水平向地震检波器的研究[J].光学学报,2010,30(9):2493～2503
6Fan Shuwei,Zhou Qinghua,Li Hong.Research of optimizationdesign of groove diffraction grating profile parameters[J].ActaOptica Sinica,2010,30(11):3133～3139樊叔维,周庆华,李红.槽型衍射光栅结构参数优化设计研究[J].光学学报,2010,30(11):3133～3139
7Huang Yuanming,Zhou Fufang,Zhai Baogai.Fabrication oforganic groove-free gratings[J].Acta Optica Sinica,2009,29(5):1160～1162黄远明,周甫方,翟保改.有机无刻痕光栅的研制[J].光学学报,2009,29(5):1160～1162
8Luo Changzhou,Sun Yan,Gao Liminet al..Theoretical analysison phase of moiréfringes'signal affected by shaft eccentricity[J].Acta Optica Sinica,2003,23(8):1013～1016罗长洲,孙岩,高立民等.码盘偏心对叠栅条纹信号相位影响的理论分析[J].光学学报,2003,23(8):1013～1016
9Yang Chuping,Weng Jiawen,Zhao Jing et al..Extract originalgrating information from deformed grating pattern[J].ActaOptica Sinica,2009,29(11):3078～3081杨初平,翁嘉文,赵静等.从变形光栅条纹提取基准光栅信息[J].光学学报,2009,29(11):3078～3081
10Luo Changzhou,Sun Yan,Hu Xiaodong et al..The affect onphase of moire fringes'signal caused by shaft eccentricity[J].Acta Photonica Sinica,2003,32(10):1271～1273罗长洲,孙岩,胡晓东等.码盘偏心对叠栅条纹信号相位的影响[J].光子学报,2003,32(10):1271～1273
11Yang Guoguang.Modern Optical Testing Technology[M].Hangzhou:Zhejiang University Press,2005.272～277杨国光.近代光学检测系统[M].杭州:浙江大学出版社,2005.272～277
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