Patent · US Active

Fiber-optic current sensor with polarimetric detection scheme

US7692420B2 · kind B2 · utility

4Cited by

6References

17Claims

0Family size

Assignee

ABB RESEARCH LTD. · CH

Inventors

Klaus Bohnert · Oberrohrdorf, CH
Andreas Frank · Sindelfingen, DE
Hubert Brandle · Oberengstringen, CH

Key dates

Filing date	Oct 22, 2008
Grant date	Apr 6, 2010
Priority date	—
Expiry date	Oct 22, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG01R15/246
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The current in a conductor is measured by exploiting the Faraday effect in a sensing fiber. The light returning from the sensing fiber is split into at least two parts, at least one of which is analyzed by a first circular analyzer for generating a first signal. A second part may e.g. be analyzed by a second circular analyzer, and a third part may be analyzed by a linear analyzer. By combining the signals obtained in this way, the current induced phase delay in the returning light can be measured efficiently and accurately.

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