Optical d.c. voltage transformer
US5153427A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/242
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical d.c. voltage transformer having an electrooptic medium to which a d.c. electrical field or voltage to be measured is to be applied. The electrooptic medium affects the polarized light from the polarizer by an electrooptical effect to a degree proportional to the strength of the electrical field or voltage. The transformer includes a photodetector for producing an optical signal proportional to the affected light received from the electrooptic medium, a device for converting the optical signal from the photodetector into an electrical signal, a chopper for pulsating the electrical field or voltage to be applied to the electrooptic medium, in terms of time, a detector for demodulating the electrical signal from the converting device in synchronism with the pulsated electrical field or voltage, and an output unit for visually presenting the demodulated electrical signal similar in polarity to the electrical field or voltage to be measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.