Three-dimensional electric field sensor with low inter-axis coupling

Abstract

When three-dimensional electric field sensor(3D EFS) with orthogonally arranged capacitive-type sensing units is used to measure space electric fields, measurement accuracy is liable to be affected by the coupling effect between axes. In this study, an electric field shielding electrode was proposed to reduce the interaxial coupling effect in 3D EFS and improve the measurement accuracy. Firstly, the multiphysics field simulation software was used to construct an electric field model. Then, the capacitive-type sensing units of the 3D EFS with shielding electrode was developed by simulation results. Finally, an arbitrary angle test platform was set up to experimentally test the 3D EFS with shielding electrodes and the 3D EFS without shielding electrodes. The experimental results showed the measurement deviation of the 3D EFS with shielding electrodes was within 3.2%, which was 12% lower than that of the 3D EFS without shielding electrodes. It can be concluded that the 3D EFS based on the electric field shielding structure can make the decoupling matrix more reliable and reduce the measurement deviation of space electric field.

Keywords

capacitive-type electric field sensor(EFS) / 3D electric field / simulation analysis / inter-axis coupling / electric field shielding

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