一种构建同源数字参考信号的电场式时栅信号处理方法  

An electric field time-grating signal processing method for constructing homologous digital reference signals

作　　者：康成蓥 郭艳梅 于治成[1,2] 蒲红吉 樊星辰[3] KANG Chengying;GUO Yanmei;YU Zhicheng;PU Hongji;FAN Xingchen(Engineering Research Center of Mechanical Testing Technology and Equipment,Ministry of Education,Chongqing University of Technology,Chongqing 400054,China;Chongqing Key Laboratory of Time-Grating Sensing and Advanced Testing Technology,Chongqing University of Technology,Chongqing 400054,China;School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]重庆理工大学机械检测与装备技术教育部工程研究中心,重庆400054 [2]时栅传感及先进检测技术重庆市重点实验室,重庆400054 [3]合肥工业大学仪器科学与光电工程学院,合肥230009

出　　处：《重庆理工大学学报（自然科学）》2023年第7期161-168,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市教委“成渝地区双城经济圈建设”科技创新项目(KJCX2020043);重庆市教委科学技术研究项目(KJQN202001133)。

摘　　要：提出了一种电场式时栅信号相位变化测量的新方法。利用时栅感应信号频率固定不变、相移2π后回到相位初始点的特性,将基于高频脉冲的计数器作为时间测量尺,且时间测量尺满量程测量时间等于感应信号周期变化时间,通过多重相位时钟采样对时间刻度进行了细分。感应信号相位周期移动时,其对应时间测量尺上的读数呈现周期性变化。该方法基于时栅感应信号的固有特点,避免了因构建实体参考信号导致的时间基准不一致、信号偏斜、边沿抖动等造成的测量误差,以及对多重相位时钟采样性能的限制,进一步提升了测量稳定性和分辨率。通过设计基于FPGA芯片的时栅信号处理系统,并在120对极的电场式圆时栅传感器上对该优化方法进行了可行性测试,传感器稳定性达到0.405″,较之前提升近3倍,理论分辨率和实际分辨率分别为0.135″和0.54″,较之前提升约2倍。This paper proposes a new method for measuring the phase change of electric field time-grating signals.This method uses the characteristics that the frequency of the time-grating induction signal is fixed and the signal returns to the initial phase point after the phase shift of 2π.The counter based on the high frequency pulse is used as the time measuring ruler,and the full range measurement of the ruler is equal to the periodic change time of the induction signal.The time scale is then subdivided by multiple phase clock sampling.When the phase of the signal moves periodically,the corresponding reading on the ruler changes periodically.Based on the inherent characteristics of the time-grating induction signal,this method avoids the measurement errors caused by the inconsistency of the time reference,signal skew and edge jitter in the construction of the entity reference signal,and also avoids the limitation of the sampling performance of the multi-phase clock,which further improves the measurement stability and resolution.By designing a time-grating signal processing system based on FPGA,a feasibility test of the optimized scheme is carried out on a 120-pole electric field circular time-grating sensor.The stability of the sensor reaches 0.405′′,which is nearly 3 times higher than before.The theoretical resolution and actual resolution are 0.135′′and 0.54′′,which are about 2 times higher than before.

关 键 词：电场式时栅 信号处理 时间测量 多相时钟采样 

分 类 号：TH7[机械工程—仪器科学与技术]