Method and system for optically detecting an electric current by means of light signals having different wavelengths

US6515467B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Bosselmann · Erlangen, DE
• Stephan Mohr · Jena, DE
• Michael Willsch · Jena, DE

Key dates

• Filing date: Jun 21, 2001
• Grant date: Feb 4, 2003
• Expiry date: Jun 21, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R15/247
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The method and system serve to optically detecting an electric current with an extended measurement range. To that end, two light signals having different wavelengths pass through a Faraday element, the polarization of the two light signals being rotated in each case by at least 0.0014°/A as a function of the electric current. By taking account of both wavelength-dependent polarization rotations, at least one of which lies beyond an unambiguity range, the measurement range is extended distinctly beyond the unambiguity range of each of the two light signals.