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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (7): 1029-1037    DOI: 10.1631/jzus.A0820358
Electrical and Electronic Engineering     
Characteristics analysis and parameters optimization for the grating eddy current displacement sensor
Hong-li QI, Hui ZHAO, Wei-wen LIU
Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Abstract  The grating eddy current displacement sensor (GECDS) for distance or position measurement used in watertight electronic calipers was described. The sensor relies on repetitive variation of inductance against displacement caused by the change of coupling areas between moving coils and static reflectors. The investigations focused on setting up and utilizing a computer model of the 3D eddy current fields and geometry to analyze causes of the production of measurement blind areas, and to investigate effects of the sensor parameters, such as axial gap between coils and reflectors, reflector length and reflector width on characteristics of the sensor. Simulation results indicated that the sensor has the smallest nonlinearity error of 0.15%, which agrees well with the experimental results.

Key words： Grating eddy current displacement sensor (GECDS)      Watertight electronic calipers      Parameters optimization      Nonlinearity     
Received: 09 May 2008     
CLC:  TH7  
  TM15  
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Hong-li QI
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Wei-wen LIU
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Hong-li QI, Hui ZHAO, Wei-wen LIU. Characteristics analysis and parameters optimization for the grating eddy current displacement sensor. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(7): 1029-1037.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820358     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I7/1029

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