Patent ID: 6411077
Filing Date: 2002-06-25
Classification: G01R

Abstract:
An optical-voltage sensor comprising a polarizer for converting incident light into linearly polarized light; a Â¼ wavelength plate for converting said linearly polarized light into circular polarized light; electro-optical elements having front and back surfaces with respect to a transmitting direction of said circularly polarized light and which transmits said circular polarized light therethrough and performs phase modulation of said circularly polarized light corresponding to a voltage applied to transparent electrodes attached to the front and back surfaces of the electro-optical elements; and an analyzer for sensing said circularly polarized light transmitted through said electro-optical elements, whereintwo of said electro-optical elements are arranged adjacently to each other along the transmitting direction of the light, and a voltage to be measured is applied to each of said two electro-optical elements, wherein the voltage applied to one of said two electro-optical elements is of opposite polarity to the voltage applied to the other of said two electro-optical elements.