Influence of particle size on Lichtenberg Figure technique for surface charge characterization

The Lichtenberg Figure technique is a method that can directly observe the surface charge distribution of the insulating material. It is widely used in the observation of the charge at the gas-solid interface and the study of the discharge mechanism. A needle-plate electrode was used to corona charge the polyimide film. The influence of the particle size on the spatial resolution of the surface charge measurement presented by the Lichtenberg Figure was studied by selecting dust of different particle sizes. A surface potential measurement system was constructed for verifying whether the dust affects the original charge distribution on the insulating surface. The results show that as the particle size of the dust becomes smaller, the accuracy of the Lichtenberg Figure is improved, and the influence of the dust on the original charge distribution can be reduced through the improvement of the test method.