Abstract
We developed a new measurement method for surface charge distribution on an insulating film by Pockels effect of BSO single-crystal cell. The cell has only one transparent metal plate electrode which is located at the rear surface of the cell and is grounded. The insulating film of PET is placed on the other surface. Electrical surface charges are placed on the film by a high-voltage discharge between the rear plate electrode and a point electrode. The applied AC voltage (50Hz) on a 36μm-thick film had a peak of approximately 4kV. Positive and negative discharge figures were alternately obtained using a reflection light from the BSO crystal cell. Using circular polarized incident light, the polarity of the surface charge was determined. These results are closely related to the charge densities obtained by other methods.
