摘要
为提高小型光电编码器精度,设计了精码莫尔条纹信号细分误差校正方法。首先建立存在直流分量、幅值误差、波形畸变的精码光电信号的波形方程,然后利用牛顿迭代法将两路精码细分信号校正至标准的正弦和余弦信号,最后建立两路信号间的正交性误差模型,通过最小二乘法求解出正交性误差校正参数。运用本文的细分误差校正法对某16位小型绝对式光电编码器进行误差校正处理,经测试,细分误差峰峰值由校正前的160″减小到校正后的48″。实验结果表明:研究的误差校正方法可以有效地减小细分误差、提高编码器精度,对于研制小型化、高精度光电编码器具有重要意义。
In order to improve the accuracy of small photoelectric encoders,an interpolation error calibration method of Moir6 fringe fine code signal is designed. First, the waveform equations of the fine code photoelectric signal that contains DC component, amplitude error and waveform distortion are built, and then the two channel fine code inter- polation signals are calibrated to standard sine and cosine signals using the Newton iteration method. An orthogonal error model for the two channel signals is built finally, and the error calibration parameters can be solved with the least squares fitting. The proposed interpolation error calibration method was used to carry out the error calibration processing of a 16-bit small absolute photoelectric encoder; and according to the test result, the peak-to-peak value of interpolation error is calibrated from 160＂ to 48＂. Experiment result shows that,the proposed error calibration method can effectively reduce the interpolation error and improve the accuracy of eneoders, which has significant importance in the development of small and high-accuracy photoelectric encoders.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2013年第6期1374-1379,共6页
Chinese Journal of Scientific Instrument
基金
中国科学院知识创新领域前沿项目资助
关键词
小型光电编码器
细分误差
校正
牛顿迭代法
最小二乘法
small photoelectric encoder
interpolation error
calibration
Newton iteration method
least squares fitting
