光学学报, 2013, 33 (7): 0712001, 网络出版: 2013-04-28   

光栅条纹光电信号正弦性偏差的自动补偿

Automatic Compensation of Sine Deviation for Grating Fringe Photoelectric Signal
作者单位
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100049
摘要
为了提高光电轴角编码器的细分精度,提出一种光栅条纹光电信号正弦性偏差的自动补偿方法,依据编码器精码转换的方波信息实现精码信号的自适应采样,完成光电编码器精码时域信号向等间隔空域信号的转换;通过实际采集24位光电编码器周期光栅条纹光电信号,并对其离散幅值序列做频谱分析,揭示了高精度光电编码器信号正弦性偏差的主要谐波成分并建立波形方程;根据光栅条纹光电信号的数学模型及幅值细分原理,建立了信号细分误差的补偿模型;采用粒子群优化算法辨识波形方程中的7个待定参量,并对信号进行修正。应用细分误差补偿模型对补偿前后的细分误差进行分析,结果表明,编码器光电信号的细分误差峰值由0.923″降低到0.316″。该方法可实际应用于编码器系统,能够提高编码器的环境适应性和测角可靠性。
Abstract
In order to improve the subdivision accuracy of photoelectric rotary encoder, the method of automatic compensation of sine deviation for the grating fringe photoelectric signal is proposed. According to square wave information from precise code conversion, adaptive sampling of precise code signal is realized. The transformation process of precise code time domain signal to equal interval spatial domain signal is completed. Periodic grating fringe photoelectric signal of 24 bit photoelectric encoder is actually collected and frequency spectral analysis of discrete amplitude sequence for photoelectric signal is completed. The main harmonic components of sine deviation for high precision photoelectric encoder signal are revealed and waveform equation is established. Based on the mathematical model of grating fringe photoelectric signal and amplitude subdivision principle, compensation model of subdivision error is established. Seven undefined parameters of signal model are identified using particle swam optimization (PSO) and the signal is corrected. Uncompensated and compensated subdivision error are analyzed using subdivision error compensation model. The experimental results show that the peak value of subdivision error is reduced from 0.923″ to 0.316″. This method can actually be used in encoder system, which improves environmental adaptability and angle measurement reliability of the encoder.

高旭, 万秋华, 卢新然, 孙莹. 光栅条纹光电信号正弦性偏差的自动补偿[J]. 光学学报, 2013, 33(7): 0712001. Gao Xu, Wan Qiuhua, Lu Xinran, Sun Ying. Automatic Compensation of Sine Deviation for Grating Fringe Photoelectric Signal[J]. Acta Optica Sinica, 2013, 33(7): 0712001.

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