Optical fibre current sensor, uses temperature-dependent phase delay element for compensating temperature dependency of sensor fibre Verdet constant

摘要

The current sensor has a sensor fibre (1) wound in a coil around the outside of a current conductor (S) in a Sagnac or reflexion interferometer configuration and coupled to at least one phase delay element (4,5), providing a temperature-dependent phase delay for compensating the temperature dependency of the Verdet constant of the sensor fibre.