The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2012
Filed:
Sep. 27, 2010
Robert Wueest, Zurich, CH;
Andreas Frank, Zurich, CH;
Klaus Bohnert, Oberrohrdorf, CH;
Philippe Gabus, Nussbaumen, CH;
Robert Wueest, Zurich, CH;
Andreas Frank, Zurich, CH;
Klaus Bohnert, Oberrohrdorf, CH;
Philippe Gabus, Nussbaumen, CH;
ABB Research Ltd, Zürich, CH;
Abstract
A method is provided for tuning the fiber optic retarder of a fiber optic current sensor towards a desired temperature dependence, the sensing fiber is exposed to a magnetic field or corresponding electric current and the sensor signal as well as the signal's dependence on the retarder temperature are measured. From this initial sensor signal and its temperature dependence, a target sensor signal can be determined, at which the dependence on the retarder temperature equals a desired value. Then, the retarder is thermally treated until the sensor signal reaches the target value. The method obviates the need for repetitively measuring the temperature dependence during the tuning process.