STUDY OF CHARGE INJECTION IN INSULATORS SUBMITTED TO DIVERGING FIELDS

Various theoretical models have been proposed to explain the behavior of insulator-electrode interfaces in the case of strongly divergent el ectric fields. However until recently a direct measurement of the char ge transferred at these interfaces could not be performed and very ind irect ways had to be used. In this paper we propose a structure which allows for direct measurements of this charge using the PWP (pressure wave propagation) method. We present evidence of charge transferred ar ound small diameter wires, embedded in an insulator, submitted to an a pplied voltage.