Design of Array Electrode Sensor for Buried Oil Tank ECT System

The issue of environmental protection has received constant attention from the state, and the problem of leakage of buried oil tanks has also been paid attention. This paper is based on the ECT method to detect the leakage of buried oil tanks, analyzing and designing array sensors that are more suitable for this application, and proposing different electrode coverage and different numbers of array ring sensors. Based on COMSOL software, three-dimensional finite element models of ECT sensors under six conditions were constructed, and their capacitance and sensitivity were calculated. Firstly, the influence of capacitance sensor under different electrode coverage on sensitivity nonuniformity P and capacitance dynamic range M is analyzed; then, the influence of capacitance sensor under different electrode number on sensitivity non-uniformity P and capacitance dynamic range M is analyzed. Finally, comparing the values of P and M, conclusion can be obtained: the array sensor is the best when the electrode coverage rate is 1/2 and the number of electrodes is 4.