Comparison of measurement results and simulations based on finite element method for an electrical capacitance tomography system

Electrical capacitance tomography (ECT) systems require multiple inter-electrode capacitance measurements or multiple electrode potential measurements as input for their reconstruction algorithms. The paper describes the electronic circuitry developed to provide the required data for the Gauss-Newton type reconstruction algorithm used at the Institute, as well as the models for simulating the sensor geometry and the electronic circuitry. The short-and long-term stability of the circuitry is analyzed. Furthermore, the electrode voltages predicted by simulations are compared to the measured potentials.