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为了保证高精度光电编码器在恶劣工作环境下的精确测量,建立一种基于高分辨力数字电位计+DSP+CPLD的莫尔条纹光电信号自动补偿系统。首先,介绍了自动补偿系统的工作原理及构成,并设计了系统使用过程中的工作模式;融合莫尔条纹信号各个偏差的补偿算法,建立了光电信号细分误差的综合补偿模型;然后,具体阐述了系统的硬件设计、相关软件设计,并分析了补偿系统自身存在的系统误差;最后,以24位光电编码器为实验对象,对该补偿系统进行测试分析,实验结果表明:自动补偿系统可实现编码器精码信号直流电平漂移、等幅性偏差、正交性偏差及二次、三次、五次谐波偏差的综合补偿,可使实际的静态细分误差减小0.61″。该系统可用在编码器的工作现场,实现莫尔条纹信号细分误差的自动修正。
In order to ensure accurate measurement of high precision optical encoder in harsh working environment, a moiré photoelectric signal automatic compensation system based on high resolution digital potentiometer + DSP + CPLD is established. Firstly, the working principle and structure of automatic compensation system are introduced, and the working mode in the process of system operation is designed. The compensation algorithm of each deviation of Moiré fringe signal is fused, and the comprehensive compensation model of photoelectric signal subdivision error is established. Then, The hardware design of the system and the related software design are expatiated, and the systematic errors existing in the compensation system are analyzed. Finally, the 24-bit photoelectric encoder is used as the test object to test the compensation system. The experimental results show that the automatic compensation system Realization of the DC level drift, equal amplitude deviation, orthogonality deviation and the second, third and fifth harmonic deviation compensation of the encoder signal can reduce the actual static subdivision error by 0.61 ". The system is available In the encoder work site, to achieve Moiré fringe signal subdivision error automatic correction.