Analysis and processing of Morié fringe signals based on non-uniform sampling

ZUO Yang; LONG Ke-hui; LIU Jin-guo; LIU Bing; ZHOU Lei; QIAO Ke

doi:10.3788/OPE.20152304.1146

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Analysis and processing of Morié fringe signals based on non-uniform sampling

更新时间：2020-08-13

- Analysis and processing of Morié fringe signals based on non-uniform sampling
- Optics and Precision Engineering Vol. 23, Issue 4, Pages: 1146-1152(2015)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152304.1146
  CLC： TP212.12;TN762
- Received：21 April 2014，
  
  Revised：10 June 2014，
  
  Published：25 April 2015
- 稿件说明：
移动端阅览
左洋, 龙科慧, 刘金国等. 非均匀采样莫尔条纹信号的分析与处理[J]. 光学精密工程, 2015,23(4): 1146-1152

ZUO Yang, LONG Ke-hui, LIU Jin-guo etc. Analysis and processing of Morié fringe signals based on non-uniform sampling[J]. Editorial Office of Optics and Precision Engineering, 2015,23(4): 1146-1152
左洋, 龙科慧, 刘金国等. 非均匀采样莫尔条纹信号的分析与处理[J]. 光学精密工程, 2015,23(4): 1146-1152 DOI： 10.3788/OPE.20152304.1146.

ZUO Yang, LONG Ke-hui, LIU Jin-guo etc. Analysis and processing of Morié fringe signals based on non-uniform sampling[J]. Editorial Office of Optics and Precision Engineering, 2015,23(4): 1146-1152 DOI： 10.3788/OPE.20152304.1146.

摘要

为了动态、实时地测量光电编码器在变速转动情况下的细分误差

提出了一种莫尔条纹信号的非均匀采样分析与处理方法。利用傅里叶级数原理构造了实际情况下的莫尔条纹信号方程

根据编码器在不同转速下的实时采样

揭示了莫尔条纹信号的非均匀采样特征。鉴于信号采样的非均匀性

采用曲线拟合的最小二乘法重构莫尔条纹信号

利用离散傅里叶变换算法分析重构信号并求出波形参数。通过信号参数与细分误差的关系式

测量了编码器动态细分误差。采用该方法对21位绝对式光电编码器莫尔条纹信号进行了分析和处理

两次测试得到其动态细分极值误差为+3.21"、-4.69"和+3.45"、-4.81"。实验结果表明

该方法可以有效地分析和处理编码器在非匀速转动下产生的变频莫尔条纹信号

精确地测量编码器的动态细分误差

为工作现场编码器误差的实时检测与修正奠定了基础。

Abstract

To measure the dynamic real-time interpolation error of an optical encoder in non-uniform rotation

a method for analysis and processing the Morié fringe signals based on non-uniform sampling was presented. The real Morié fringe signal equation was constructed by Fourier series principle. According to real-time sampling on the encoder at different speeds

the characteristics of non-uniform sampling for Moiré signals was revealed. On the basis of the non-uniformity of the signal sampling

the Morié fringe signals were reconstructed by using the least square curve fitting.Reconstructed signals were analysed by Discrete Fourier Transform algorithm and the waveform parameters were obtained. With the relationship between interpolation error and signal parameters

the measurement of encoder dynamic error was achieved. The Moiré fringe signal of a 21 bit absolute optical encoder was analysed and processed and the twice extreme dynamic interpolation errors are +3.21 ";-4.69" and +3.45 ";-4.81"

respectively.Experiment result shows that this method effectively processes Morié fringe signal of variable frequency in the encoder with non-uniform rotation

and accurately measures the dynamic interpolation error of the encoder

which provides foundation for real-time detection and correction of encoder error at the actual work site.

关键词

Keywords

references

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