Three-dimensional electric field mapping in dielectric liquids using Kerr electrooptic measurement with ART

Kerr electrooptic method is useful in measuring electric fields. Three-dimensional nonuniform electric field distributions were measured in dielectric liquids, nitrobenzene and transformer oil, by Kerr electrooptic measurement. The field distributions were measured in sphere-to-sphere electrodes systems. An optical system was composed of a He-Ne laser, a polarizer, a quarter-wave plate, an experimental cell, an analyzer, and a photodetector. When a negative high voltage pulse was applied to the electrodes system, the light intensity was measured by the photodetector. The intensity measurement was carried out at many points in each direction from 0 to π. From the obtained data, the electric field vector distribution was reconstructed by algebraic reconstruction technique (ART). The measured distributions were compared with the theoretical ones calculated by electric image method