Optical measuring method and optical measuring device for measuring an alternating magnetic field having intensity normalization

US6154022A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Michael Willsch · Jena, DE
• Thomas Bosselmann · Erlangen, DE
• Stefan Hain · Rückersbach, DE

Key dates

• Filing date: Jun 2, 1998
• Grant date: Nov 28, 2000
• Expiry date: Jun 2, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/0322
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In mutually opposite directions, two light signals traverse an optical series circuit including a first multi-mode fiber, a first polarizer, a Faraday sensor device, a second polarizer and a second multi-mode fiber. An intensity-normalized measuring signal is derived with the aid of direct signal components from light intensities of the two light signals after traversal of the series circuit.