A planar capacitive sensor for 2D long-range displacement measurement  

作　　者：Jian-ping YU Wen WANG Ke-qing LU De-qing MEI Zi-chen CHEN 

机构地区：[1]Department of Mechanical Engineering,Zhejiang University [2]School of Mechanical Engineering,Hangzhou Dianzi University

出　　处：《Journal of Zhejiang University-Science C(Computers and Electronics)》2013年第4期252-257,共6页浙江大学学报C辑（计算机与电子（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (No. 51275465);the National Basic Research Program (973) of China (No. 2011CB013300);the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education,China (No. [2011]1568)

摘　　要：A planar capacitive sensor(PCS) capable of 2D large-scale measurement is presented in this paper.Displacement interpretation depends on independently measuring the periodic variation in capacitance caused by the change in the overlapping area of sensing electrodes on a moving plate and a fixed plate.By accumulating the number of quarters in each direction and the specific position in the final quarter,the large-scale measurement is fulfilled.Displacements in Xand Y-direction can be measured independently and simultaneously.Simulation shows that a shorter gap distance and a longer electrode guarantee better sensitivity.Experiments based on a PCS test bench demonstrate that the PCS has a sensitivity of 0.198 mV/μm and a resolution of 0.308 μm.An electric fringe effect and other possible measurement errors on displacement interpretation accuracy are discussed.The study confirms the high potential of PCSs as innovative 2D long-range displacement sensors.A planar capacitive sensor （PCS） capable of 2D large-scale measurement is presented in this paper. Displacement interpretation depends on independently measuring the periodic variation in capacitance caused by the change in the overlapping area of sensing electrodes on a moving plate and a fixed plate. By accumulating the number of quarters in each direction and the specific position in the final quarter, the large-scale measurement is fulfilled. Displacements in X-and Y-direction can be measured independently and simultaneously. Simulation shows that a shorter gap distance and a longer electrode guarantee better sensitivity. Experiments based on a PCS test bench demonstrate that the PCS has a sensitivity of 0.198 mV/μm and a resolution of 0.308 μm. An electric fringe effect and other possible measurement errors on displacement interpretation accuracy are discussed. The study confirms the high potential of PCSs as innovative 2D long-range displacement sensors.

关 键 词：Planar capacitive sensor （PCS） Displacement measurement 2D large-scale measurement 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH822[自动化与计算机技术—控制科学与工程]