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Electrical Capacitance Tomography (ECT) is a non-destructive visual measurement technology, which is mainly used in the detection of two-phase flow and multi-phase flow. In this paper, according to the characteristics of the non-uniform sensitive field and the low sensitivity of the central area of the capacitance sensor, the finite element simulation analysis in COMSOL and the orthogonal test design method are introduced to optimize the structural parameters of the capacitance sensor, including the geometric size of the electrode plate, the height of the shield, the thickness of the pipe wall and its relative permittivity. In view of the analytical relationship between the structural parameters and the performance optimization indexes of the capacitance sensor, and there are many parameters need to be optimized, this paper proposes a fuzzy comprehensive satisfaction index (FCSI) as the evaluation standard, and on this basis carries out the optimization design of the structural parameters of the capacitance sensor. The simulation results show that the fuzzy optimization design based on multi index orthogonal experiment makes the capacitance sensor meet the requirements of uniform sensitive field distribution and high reconstruction image quality at the same time.

ECT Sensor Simulation and Fuzzy Optimization Design Based on Multi Index Orthogonal Experiment