A miniature electro-optic voltage sensor system capable of accurate operation at high voltages. The system employs a transmitter, a sensor disposed adjacent to but out of direct electrical contact with a conductor on which the voltage is to be measured, a detector, and a signal processor. The transmitter...http://www.google.de/patents/US5892357?utm_source=gb-gplus-sharePatent US5892357 - Electro-optic voltage sensor for sensing voltage in an E-field
