Siemens Aktiengesellschaft

Siemens Aktiengellschaft

Stephan Mohr

Thomas Bosselmann

Michael Willsch

Peter Menke

Mario Wollenhaupt

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&deg;/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.

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

A polarimetric sensor includes a sensor unit constructed as a permanently assembled unit having a polarizer, a sensor element and an analyzer. An input optical waveguide and an output optical waveguide with a core diameter of at least 100 &mgr;m are provided. A first light signal emerging from the input optical waveguide passes directly through the sensor unit and enters the output optical waveguide as a second light signal. An optical path of the first light signal through the sensor element is no longer than 50 times the core diameter of the output optical waveguide. No separate focussing or collimation optics are provided.

Polarimetric sensor for the optical detection of a magnetic field and polarimetric sensor for the optical detection of an electric current

A method and a configuration are provided for digitally processing an analog signal, especially of output quantities of an optical transducer. The analog signal is divided into a number of partial analog signals having in each case different frequency ranges. The levels of the partial signals are adapted to the dynamic ranges of downstream digitizing device by analog amplification. This results in an improved signal-to-noise ratio.

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Jena, Germany

Stephan Mohr