A Measurement Compensation Method for Electrical Capacitance Tomography Sensors with Inhomogeneous Electrode Parameters

An electrical capacitance tomography (ECT) sensor is an array capacitive sensor that is sensitive to the medium of the measured object and can be widely used in oil, natural gas, machinery and other industrial fields to solve the problem of multiphase fluid object parameter detection in industrial processes. However, ECT sensor uniformity defects need to be addressed. Aiming at the problem that the non-uniform electrode spacing angle affects the characteristics of the measured value of the actual ECT sensor, a method for compensating the measured value of the ECT sensor based on the assumption that the geometric factor is invariant is proposed. The simulated measurement value in the case of the tube and the measurement value of the actual sensor in the case of an empty tube and a full tube are to compensate the measurement value of the actual ECT. Experiments show that, without compensation, non-ideal sensor monitoring has large error, and, after compensation, it has a good effect and can be expected to perform satisfactorily in practical use.

Automated summary

An electrical capacitance tomography (ECT) sensor is widely used in industrial fields for multiphase fluid object parameter detection. However, the uniformity defects of ECT sensors need to be addressed. This study proposes a method for compensating the measured value of ECT sensors based on the assumption of invariant geometric factor. Experiments show that the compensated ECT sensor has good monitoring effect and can be expected to perform well in practical use.