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Front. Inform. Technol. Electron. Eng.  2013, Vol. 14 Issue (4): 252-257    DOI: 10.1631/jzus.C12MNT03
    
A planar capacitive sensor for 2D long-range displacement measurement
Jian-ping Yu, Wen Wang, Ke-qing Lu, De-qing Mei, Zi-chen Chen
Department of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
A planar capacitive sensor for 2D long-range displacement measurement
Jian-ping Yu, Wen Wang, Ke-qing Lu, De-qing Mei, Zi-chen Chen
Department of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
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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 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    
Abstract: 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.
Key words: Planar capacitive sensor (PCS)    Displacement measurement    2D large-scale measurement
收稿日期: 2012-10-09 出版日期: 2013-04-03
CLC:  TH711  
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Jian-ping Yu
Wen Wang
Ke-qing Lu
De-qing Mei
Zi-chen Chen

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Jian-ping Yu, Wen Wang, Ke-qing Lu, De-qing Mei, Zi-chen Chen. A planar capacitive sensor for 2D long-range displacement measurement. Front. Inform. Technol. Electron. Eng., 2013, 14(4): 252-257.

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