Patent ID: 6734657
Filing Date: 2004-05-11
Classification: G01R

Abstract:
A fiber optic current sensor, comprising:a coiled sensor fiber which encloses a current conductor; and at least one phase delay element adjoining the sensor fiber; wherein the sensor fiber has a Verdet's constant V, which Verdet's constant V has a temperature dependence; wherein the sensitivity of the sensor is describable by a generally temperature-dependent function SK(T); wherein changes in the function SK(T) owing to the temperature dependence of the Verdet's constant V are describable by a function TV(T); wherein changes in the function SK(T) owing to the temperature dependence of the at least one phase delay element are describable by a function TW(T); wherein the phase delay of the at least one phase delay element is chosen such that the function TW(T) is such that the product K(T)=TV(T)Â·TW(T) is at least approximately temperature independent.