Structural comparison of electrical capacitance tomography sensor

The electrical capacitance tomography technology is based on the principle of capacitance sensitivity. It can realize the visualization of the distribution of internal multiphase media by measuring the change of the external capacitance array of the closed pipe or container. The design of capacitance sensor is one of the key problems in the electrical capacitance tomography system. This article carries on the analysis for the two-dimensional structure of the capacitance sensor. The effects of different sensor structure on the measuring capacitance, image reconstruction and so on are compared in detail, through the use of the driven guard electrode, shielding strip, shielding ring. The corresponding simulation data and reconstructed results are given. The simulation results show that the dynamic range of capacitance is small and the reconstruction effect is better by using the combination of driven guard electrode, shielding strip and shielding ring. This paper provides a reference for the optimal design of the electrical capacitance tomography sensor in industrial applications.