Process and arrangement for measuring a magnetic field using the faraday effect with compensation for variations in intensity and temperature effects
CA 2208478 C · Owner: Siemens Aktiengesellschaft · Inventors: Menke, Peter; Bosselmann, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Two light signals pass through a series connection of a first multimode optical fiber, a first polarizer a, Faraday sensor device, a second polarizer and 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.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 8, 1995 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.