Voltage measuring device having electro-optic sensor and compensator
US5113131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Feb 16, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/241
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for measuring an unknown voltage using electro-optic materials includes a beam transmitter, voltage sensor, and a receiver. The beam transmitter generates an electro-magnetic beam directed at an electro-optic material in the sensor. The electro-optic material has a voltage gradient across it due to the unknown voltage. The beam is such that it has components both parallel and perpendicular to the direction of the voltage gradient so that passing through the electro-optic material creates a phase difference between the parallel and perpendicular components. This beam with the phase difference passes to the receiver where the beam passes through a compensator formed by another electro-optic material subjected to a voltage gradient from a measurable voltage. The measurable voltage is controlled to produce another relative phase retardation which compensates for the phase retardation produced at the sensor. The net retardation caused by the two electro-optic materials is detected using first and second detectors for converting the intensities of the parallel and perpendicular components into respective first and second voltages. The first and second voltages are…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.