Measurement of the 2-dimensional electric field vector in dielectric liquids

Abstract
A new measurement technique for two-dimensional electric field vectors (electric field intensity and its direction) in liquid dielectrics has been developed in this study. The theoretical equation for measuring the electrical field vector is derived for the optical system which consists of a He-Ne laser, polarizer, quarter-wave plate, test cell with nonuniform electric field, nonpolarizing beam splitter, two analyzers and two photo detectors. The effectiveness of the technique is confirmed by comparing the theoretical values and experimental results. Furthermore, the nonuniform electric field vector distributions of the transformer oil in a compound insulation system of liquids and solids are measured.