Kerr electro-optic measurements of transformer oil in a point-plane geometry

Abstract

Electric field distributions measured using the Kerr effect have a phase shift between light components polarized parallel and perpendicular to the electric field, which is proportional to the magnitude squared of the electric field components in the plane perpendicular to light propagation integrated over the light path length. One wishes to recover the electric field distribution from measurements of light phase shifts. For axisymmetric geometries where the electric field depends only on the radial coordinate and whose direction is constant along the light path, as is the case along a planar electrode, the total phase shift for light propagating at a constant distance from the center of symmetry and the electric field distribution are related by an Abel transform pair, a special case of Radon transforms typically used in image reconstructions with medical tomography and holography. This paper examines the Abel transformation for a point-plane electrode system and reports related preliminary Kerr electro-optic field mapping measurements in transformer oil.<>