基于FPGA的转台分度误差分离电路研制  

Research on Circuit of Turntable Indexing Error Separation Based on FPGA

作　　者：马瑞翔 朱进 黄垚 朱维斌 薛梓[4] MA Ruixiang;ZHU Jin;HUANG Yao;ZHU Weibin;XUE Zi(School of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China;Zhejiang Province Institute of Metrology,Hangzhou 310019,China;College of Optical Science and Engineering,Zhejiang University,State Key Laboratory of Modern Optical Instrumentation,Hangzhou 310027,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]浙江省计量科学研究院,浙江杭州310019 [3]浙江大学光学科学与工程学院,现代光学仪器国家重点实验室,浙江杭州310027 [4]中国计量科学研究院,北京100029

出　　处：《仪表技术与传感器》2023年第7期43-47,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(52175526);国家质量监督检验检疫总局科技计划项目(2016QK189)。

摘　　要：为了提高转台测角系统精度,针对转台分度误差分离开展研究。在分析转台角度测量值的构成基础上,对傅里叶法分离分度误差原理进行阐述;设计基于现场可编程门阵列(FPGA)的多通道角度信号同步采集与传输电路,详细说明了同步采集、TCP/IP通信等电路设计。搭建转台实验平台,实验结果证明:信号采集电路能高速、稳定地传输数据,不同角度间隔下的双读数头,均可以应用傅里叶法分离转台分度误差,其中角度间隔为150°的双读数头分离效果最佳,将峰峰值为60.9″的误差减小至2.19″。In this paper,a research on separation technology of turntable indexing error was proposed in order to improve the accuracy of the turntable angular measurement system.Based on the analysis of the composition of the turntable angle measurement value,the principle of separating the indexing error by Fourier method was expounded.The multi-channel angle signal acquisition and transmission circuit based on field programmable gate array(FPGA)was designed,and the circuit design of synchronous acquisition and TCP/IP communication was explained in detail.The turntable platform was established,and the experiment shows that signal acquisition circuit can transmit data with high speed and stability,and Fourier method can be used to separate the indexing error of the turntable under different angle intervals.The double reading heads with an angle interval of 150° has the best separation effect,and the error with a peak-to-peak value of 60.9″ was reduced to 2.19″.

关 键 词：转台测角系统 分度误差 误差分离 傅里叶法 FPGA 电路 

分 类 号：TH712[机械工程—测试计量技术及仪器]