12 Electrodes Electrical Capacitance Tomography System

Electrical capacitance tomography technique(ECT)is a kind of process tomography technique(PT)based on the sensitive principle of capacitance.It can be used to calculate the fraction and identify the flow pattern and flow quantity in multiphase flow.It is known as the best measuring method of multiphase flow at present.This dissertation is based on the study of 12-electrode electrical capacitance tomography system.Mainly demonstrate a kind of electrical capacitance tomography conversion circuit based on the AC excitation signal and analyzes the working principle of the circuit,this circuit can suppress the interference of stray capacitance,to measure small capacitance changes and is characterized by strong anti-interference ability,good stability and smaller drift.