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20 February 2006 The research of circle grid-capacitance sensor
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Proceedings Volume 6041, ICMIT 2005: Information Systems and Signal Processing; 604128 (2006)
Event: ICMIT 2005: Merchatronics, MEMS, and Smart Materials, 2005, Chongqing, China
A circle grid-capacitance sensor is capable of high precision. How to correctly design and improve its precision and resolution is a prime research objective. There provided a new idea that how to realize circle grid-capacitance has high resolution by numbered emitter-poles and ruler poles. By analyzing the principle of capacitance sensor measuring the angle-displacement, there first provided a design idea that making output voltage to pulse signal, per pulse stands for a certain amount angle-displacement. And then, for getting more pulses when object rotated a certain angle, that is, the sensor will has high resolution, there must be many emitter-poles affixed on moveable grid-disk and many ruler-poles affixed on fix grid-disk. To ensure there is no pulses occurred at the same time, the number of emitter-poles and that of ruler-poles must be prime number to each other at least. At the same time, to ensure each pulse interval must be equal, the number of emitter-poles and that of ruler-poles have to be considered further more. This technique provides a new idea for right designing circle grid-capacitance and for improving its precision and resolution.
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Dezhou Xing, Chengbo Yu, Xingang Chen, and Ge Zhu "The research of circle grid-capacitance sensor", Proc. SPIE 6041, ICMIT 2005: Information Systems and Signal Processing, 604128 (20 February 2006);

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