Patent · US Active

Fiber-optic current sensor with tolerance to connector misalignment

US10877076B2 · kind B2 · utility

1Cited by

7References

22Claims

0Family size

Assignee

ABB Power Grids Switzerland AG · CH

Inventors

Klaus Bohnert · Oberrohrdorf, CH
Philippe Gabus · Nyon, CH

Key dates

Filing date	Apr 16, 2018
Grant date	Dec 29, 2020
Priority date	—
Expiry date	Sep 17, 2038

Classification

Technology area (CPC G)Physics
CPC primaryG01R19/0092
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A fiber-optic current sensor includes an opto-electronics module, a sensor head and a connecting fiber connecting the opto-electronics module to the sensor head. The sensor includes a first and a second beam splitter, between which the measuring light runs in two branches. One fiber connector is arranged in each branch, for connecting a cable assembly to the opto-electronics module. The optical path lengths between the two connectors and the second beam splitter are different, such that light waves cross-coupled into an orthogonal polarization mode due to angular misalignment of the connectors become incoherent with the non-cross-coupled waves returning from the sensor head.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.