Interferometric optical fiber electric current measuring device
US4370612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Jul 23, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The current-measuring device in accordance with the invention comprises an optical fiber wound around the conductor in which flows the current to be measured, a laser source, means for separating the radiation emitted by the source towards the two ends of the wound fiber, and for recombining the radiation emerging from these two ends, a conductor circuit through which flows an adjustable reference current, a detection device supplying a signal characteristic of the interferences between the two waves emerging from the fiber, the reference current being adjusted so that the phase shift between the two contra-rotating waves in the fiber is zero, this current being then proportional to the current to be measured flowing in the principal conductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.