Abstract:The structure of the circular plate capacitance sensor for oil monitoring is designed, and the electromagnetic field theory is used to calculate and analyze the capacitance value of the sensor and the sensitivity of the detection field. ANSYS finite element analysis software was applied to simulate the electric potential distribution and field intensity distribution inside the sensor, and the sensor characteristics consistent with the calculation results were obtained. The sensitivity distribution of the sensor field was not uniform, the sensitivity was high near the edge of the plate, and the sensitivity was low at the center. Using orthogonal experiment, the main parameters of the sensor were optimized. A set of optimal structural parameters are obtained, at the same time, the optimal arrangement scheme of two pairs of plates with 90° degrees interlacing is presented.