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《INSTRUMENT TECHNIQUE AND SENSOR》 1998-04
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The Measurement of Low Value Capacitance in Electrical Capacitance Tomography System

Yan Hua,Wang Shi\ Shao Fuqun School of Information Science & Engineering,Northeastern University,Shenyang 110006.  
Electrical capacitance tomography(ECT) is one of the techniques which were firstly developed for process tomography.ECT presents a particularly stirct demand for capacitance measurement because the capacitance changes to be measured for image reconstruction are very small relative to the ECT sensor standing capacitances,and the total stray capaciance is much larger than the to be measured.In this paper three types of low value capacitance measuring circuits,the charge/discharge circuit,the AC measuring circuit with feedback compensation,and the self-balancing capacitance measuring circuit are described,which are most suitable for the use in ECT system,Their advantages and disadvantages are also pointed out.
【CateGory Index】: TM934.2
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