基于双向黑白比的光电编码器码盘刻线均匀性检测
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摘要
针对目前常见的编码器输出电信号处理方法不能准确地反映码盘刻线均匀性误差的不足,提出了基于双向黑白比的光电编码器码盘刻线均匀性误差检测方法。利用工业数码相机进行码盘图像采集,获得光电编码器码盘精码码道的局部图像,通过图像处理进行码道边缘提取,求取双向黑白比,以双向黑白比计算各条刻线线宽的相对差,以线宽相对差的变化范围作为码盘的刻线均匀性误差。该方法以距离黑白比代替弧长黑白比,操作简单、易于实现;同时该方法不受码盘材料、尺寸的限制且不受检测系统安装误差的影响,适应范围广、精度高。最后通过实验验证了该方法的可行性。
The current method of using the electrical signal processing of the encoder output can not accurately reflect the code disc scorelines homogeneity error.To solve this problem,a method of detecting the scorelined homogeneity error of encoder code disc is proposed which is based on bidirectional black to white ratio.Using industrial digital camera for code disc image capture,we can acquire the local image of photoelectric encoder's precise codes.To obtain the bidirectional black to white ratio,we use the image processing for the extraction of the code channel edge.The relative difference of all groove width is calculated by the bidirectional black to white ratio,and the variation rage of the relative difference is taken as the homogeneity error of the encoder scribed line.The method is simple to operate,which includes an easily achieved theory that the black to white ratio of the distance replaces the arc length.In addition,it is suitable for a wide range of applications withoutthe limit of the size and material,and the operation is not affected by the detection system installation error.The feasibility of the method is verified by experiments.
The current method of using the electrical signal processing of the encoder output can not accurately reflect the code disc scorelines homogeneity error.To solve this problem,a method of detecting the scorelined homogeneity error of encoder code disc is proposed which is based on bidirectional black to white ratio.Using industrial digital camera for code disc image capture,we can acquire the local image of photoelectric encoder's precise codes.To obtain the bidirectional black to white ratio,we use the image processing for the extraction of the code channel edge.The relative difference of all groove width is calculated by the bidirectional black to white ratio,and the variation rage of the relative difference is taken as the homogeneity error of the encoder scribed line.The method is simple to operate,which includes an easily achieved theory that the black to white ratio of the distance replaces the arc length.In addition,it is suitable for a wide range of applications withoutthe limit of the size and material,and the operation is not affected by the detection system installation error.The feasibility of the method is verified by experiments.
引文
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[2]赵东华,李惠明,李超,等.某型制导炮弹跟踪模拟训练系统设计[J].火力与指挥控制,2016,41(6):133-136.Zhao Dong-hua,Li Hui-ming,Li Chao,et al.Design on guided tracking training simulation system[J].Fire Control&Command Control,2016,41(6):133-136.
[3]韩旭东,徐新行,刘长顺,等.用于星载激光通信终端的绝对式光电角度编码器[J].光学精密工程,2016,24(10):2424-2431.Han Xu-dong,Xu Xin-hang,Liu Chang-shun,et al.Absolute optical angle encoder used for laser communication terminal on satellite platform[J].Optics and Precision Engineering,2016,24(10):2424-2431.
[4]Cai Nian,Xie Wei,Peng Hong-xia,et al.A novel error compensation method for an absolute optical encoder based on empirical mode decomposition[J].Mechanical Systems and Signal Processing,2017,88:81-88.
[5]冯英翘,万秋华.小型光电编码器细分误差校正方法[J].仪器仪表学报,2013,34(6):175-180.Feng Ying-qiao,Wan Qiu-hua.Interpolation error calibration method of small photoelectric encoders[J].Chinese Journal of Scientific Instrument,2013,34(6):175-180.
[6]张红胜,杨进堂.光学码盘的检验[J].计量技术,1999(10):25-27.Zhang Hong-sheng,Yang Jin-tang.Optical disc inspection[J].Measurement Technique,1999(10):25-27.
[7]李明媛,杨进堂.计量光栅均匀性误差的检测[J].光学精密工程,1983(2):32-38.Li Ming-yuan,Yang Jin-tang.Measurement of uniformity error of grating[J].Optics and Precision Engineering,1983(2):32-38.
[8]蒋永平,徐杜,黄尚廉.圆光栅增量式光电轴角编码器性能自动检测方法[J].工具技术,1995(3):43-46.Jiang Yong-ping,Xu Du,Huang Shang-lian. A method of high-speed and automatic performance test for incremental opto-electronic shaft encoders[J].Tool Engineering(The Magazine for Cutting&Measuring Engineering),1995(3):43-46.
[9]周锋.光电码盘全码道检测方法的研究[D].北京:中国科学院大学,2014.Zhou Feng.The research of a method of photoelectric encoder entire code channel detection[D].Beijing:University of Chinese Academy of Sciences,2014.
[10]王豫喆,张丹丹.基于双向黑白比的光电编码器码盘不均匀误差检测方法[P].中国:CN107014421A,2017-08-04.
[11]李英志,刘伟宁,刘杰.计量光栅均匀性误差的检测[J].仪器仪表学报,2009,30(6):424-429.Li Ying-zhi,Liu Wei-ning,Liu Jie.Measurement of uniformity error of grating[J].Chinese Journal of Scientific Instrument,2009,30(6):424-429.
[12]Richard Szeliski.Computer Vison:Algorithms and Application[M].Berlin:Springer,2011.
[13]Benedetti L,Corsini M,Cignoni P.Color to gray conversions in the context of stereo matching algorithms[J].Machine Vision and Applications,2012,3(2):327-348.
[14]Sha Chun-shi,Hou Jian,Cui Hong-xia.A robust2DOtsu′s thresholding method in image segmentation[J].Journal of Visual Communication and Image Representation,2016,41:339-351.
[15]Niu Ya-kun,Zhao Yao,Ni Rong-rong.Robust median filtering detection based on local difference descriptor[J].Signal Processing:Image Communication,2017,53:65-72.
[16]Lang Bai-he,Shen Ling-yun,Han Tai-lin,et al.An adaptive edge detection method based on Canny operator[J].Advanced Materials Research,2011,1279(255):2037-2041.
[17]Sayago A,Boccio M,Asuero A G.Fitting straight lines with replicated observations by linear regression:the least squares postulates[J].Critical Reviews in Analytical Chemistry,2004,34(1):25-27.
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