Drift compensation technique for a magneto-optic current sensor

摘要

Drift compensation is provided for the output signal of a magneto-optic current measuring system using a current sensor with a magneto optic element wherein current through a conductor which is proximate to the magneto optic element is measured; the compensation is achieved through the use of two light emitting sources, each at a different frequency, to generate two alternating optical input signals to the current sensor to establish a signal refer­ence in order to compensate for signal drift caused by variable attenuator characteristics of the optical elements in the system.