OPTICAL VOLTAGE AND ELECTRIC FIELD SENSOR BASED ON THE POCKELS EFFECT

摘要

This invention concerns an optical voltage/electric field sensor that comprises crystal (3) the distribution of refractiveindex of which depends on electric field, wires (7) for leading the electric field onto the surface of the crystal (3), polarizers (1.4)aligned on both sides of crystal (3), and phase shift plate (2) to detect changes in the distribution of the refractive index, andoptical fibres (20) for routing light through the construction formed by polarizers (1,4) and the crystal (3). In accordance with theinvention the inner cavity surrounding crystal (3) of the sensor is filled with a transparent material (5) that has low extinctioncoefficient and dielectric constant, like silicone. The construction in accordance with the invention is highly applicable for measuringthe voltage of high frequency dryers.