基于时空转换原理的光栅莫尔信号数字细分  

Digital Subdivision Method for Grating MoiréSignals Based on Space-time Conversion Theory

作　　者：郑罡 朱维斌 黄垚 薛梓[3] ZHENG Gang;ZHU Wei-bin;HUANG Yao;XUE Zi(Institute of Industry and Trade Measurement Technique,China Jiliang University,Hangzhou 310018,China;State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,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]浙江大学现代光学仪器国家重点实验室,浙江杭州310027 [3]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8期106-110,共5页Instrument Technique and Sensor

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

摘　　要：光栅测量的分辨率受限于光栅盘的刻划间距,需通过电子细分等方法提高其测量精度。文中借助时空转换原理,通过载波调制将表征光栅位移的莫尔信号相位加载到时间信号中。证明了通过对时间信号的周期测量实现光栅莫尔信号的40倍细分的方法可行性,并基于现场可编程门阵列(FPGA)平台设计了光栅莫尔信号的40倍细分集成化的功能电路;分别使用仿真与实际电路测试验证了细分方法的有效性。基于时空转换的数字细分系统具有可靠性高、易于集成以及低成本可定制化等优点。The resolution of grating measurement is limited by the space between gratings.It is necessary to improve the measurement accuracy by electronic subdivision methods.In this paper,the phase of Moirésignals,which represents the grating displacement,was loaded into the time signal by carrier wave modulation by use of the principle of“space-time conversion”.It was proved that the method of 40 times subdivision of grating Moirésignals by measuring the period of time signal was feasible,and based on the field programmable gate array(FPGA)platform,the 40 times subdivision integrated functional circuit of grating moirésignals was designed.The effectiveness of the subdivision method was verified by simulation and actual circuit test.The digital subdivision system based on space-time conversion has the advantages of high reliability,easy integration and low-cost customization.

关 键 词：细分 时空转换 载波调制 现场可编程门阵列 

分 类 号：TH712[机械工程—测试计量技术及仪器]