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《Journal of Beijing Institute of Machinery》 2006-02
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Application of the capacitance circuit for electrical capacitance tomography system

SUN Nan,HUANG Min,QI Zhi-sheng(Department of Mechanical Engineering,Beijing Institute of Machinery,Beijing 100085,China)  
The electrical capacitance tomography system is known as the best measuring method of multi-phase flow at present.It can be used to calculate the fraction and identify the flow pattern and flow quantity in multiphase flow.The measuring and design theory of 12-electrode ECT system is studied in this paper and a method of AC-based low capacitance measurement is developed.With the advantages of stray-immunity,simple structure and easy implementation,the circuit cancels out the effect of charge injection on resolution.Test results showed that the actual resolution is 5.5×10~4 pF.
【Fund】: 北京市优秀人才培养专项经费资助项目(20041D0500602)
【CateGory Index】: TM934.2
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