The Pockels sensing system has been developed for directly measuring the potential and electric field distribution on a dielectric material. The system consists of an Ar ion laser, a Nd:YAG laser, a streak camera, and charge coupled device cameras. With this system, both the transient change in the potential distribution along a linear path of 50 mm in maximum length and the instantaneous two-dimensional potential distribution on a 25 mm square area can be measured simultaneously. The minimum resolution of this system reaches up to 0.2 ns. This article describes the transient change in potential distribution with a surface discharge in atmospheric air. The transient change of potential distribution with a propagating negative surface discharge in atmospheric air is measured with this system. The propagating direction component of the electric field Ex near the tip of the propagating streamer exceeds 3 MV/m.

No abstract

No abstract

No abstract

No abstract