Abstract:

Array electric field sensors that work in an electric field produce interference with each other, affecting the accuracy of electric field measurement. The traditional solution is to increase the sensor spacing, but not in limited space. In view of this problem, an electric field sensor with shielding ring is proposed, which can reduce the interference between sensors, thus improving the consistency of the sensor. First, by simulating the two sensors with shielded rings under the uniform electric field, the difference between the average field strength of the upper plate is obtained, and then the sensor is changed to the sensor without the shielding ring in the equal area. The simulation results show that the sensor consistency with shielded ring is higher than that without the shielding ring. By changing the width of the shield ring from 1~6 mm simulation, the shield ring width with the highest sensor consistency is 5 mm. According to the simulation results, the sensor is made by PCB process, and the conditioning circuit is designed. Finally, the sensor is calibrated to obtain a higher sensitivity of 43.215 mV/kV·m^-1, and a fitting degree of 0.999 1.

Key words: sensor spacing, uniform electric field, shielding ring, conditioning circuit, electric field sensor, consistency