2006•Unpublished venueRequires access

Application of the capacitance circuit for electrical capacitance tomography system

QI Zhi-sheng

Abstract

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.

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Key concepts: Electrical capacitance tomography, Capacitance, Parasitic capacitance, Flow (mathematics), Materials science, Electronic engineering, Resolution (logic), Electrical engineering