Process and arrangement for measuring a magnetic field using the faraday effect with compensation for variations in intensity and temperature effects

US5933000A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Bosselmann · Erlangen, DE
• Peter Menke · Erlangen, DE

Key dates

• Filing date: Jun 23, 1997
• Grant date: Aug 3, 1999
• Expiry date: Jun 23, 2017

Classification

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

Abstract

Two light signals pass through a series connection of a first multimode optical fiber, a first polarizer, a Faraday sensor device, a second polarizer an a second multimode optical fiber in opposite directions. The polarization axes of the two polarizers are set at a polarizer angle .eta. or .theta. to the natural axis of the linear birefringence in the sensor device with cos(2.eta.+2.theta.)=-2/3. The measuring signal is derived as the quotient of two linear functions of the light intensities of the two light signals after passing through the series connection.