基于FPGA的圆光栅角度动态测量电路研制  

Development of Dynamic Measuring Circuit of Circular Grating Angle Based on FPGA

作　　者：陆胤桦 朱维斌 黄垚 薛梓[2] LU Yin-hua;ZHU Wei-bin;HUANG Yao;XUE Zi(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]中国计量科学研究院,北京100029

出　　处：《仪表技术与传感器》2021年第3期35-39,共5页Instrument Technique and Sensor

基　　金：2017年国家重点研发计划资助项目(2017YFF0204901);2016国家质量监督检验检疫总局科技计划项目(2016QK189)。

摘　　要：文中针对静态测量的角度输出值无法表征圆光栅运动中当前时刻的位置这一问题,就圆光栅动态角度测量开展研究,在分析动态测角中延时误差的存在原因的基础上,提出了基于代数导数法的补偿方案。文中在FPGA上开发了适用于圆光栅动态角度测量的电路,重点阐述了电路中硬件资源和测量精度间矛盾的解决方案。搭建基于FPGA的动态角度测量电路验证系统,通过函数信号发生器产生变化的信号源来模拟光栅动态测角过程,实验结果证明,在各种运动工况下,补偿后的测量误差均处于-0.07″~0.07″范围内,证明了延时误差补偿方案对于圆光栅动态角度测量的有效性,能够有效提高动态角度测量精度。In this paper,aiming at the problem that the angle output value in the static measurement can not represent the position of the current time in the motion of the circular grating,the dynamic angle measurement of the circular grating was studied.Based on the analysis of the causes of the delay error in the dynamic angle measurement,a compensation scheme based on the algebraic derivative method was proposed.In this paper,a circuit for measuring the dynamic angle of circular grating was developed on FPGA,and the solution to the contradiction between the hardware resources and the measurement accuracy was emphasized.The dynamic angle measurement circuit verification system based on FPGA was built,and the grating dynamic angle measurement process was simulated by the signal source generated by the function signal generator.The experimental results show that the measurement error after compensation is in the range of-0.07″~0.07″under various motion conditions,which proves the validity of the delay error compensation scheme for the dynamic angle measurement of circular grating and can effectively improve the accuracy of dynamic angle measurement.

关 键 词：动态 延时误差 代数导数法 FPGA 圆光栅 角度测量 

分 类 号：TH712[机械工程—测试计量技术及仪器]