Fiber optic sensor for measuring currents with mains frequencies

The paper presents the measurement system of a fiber optic polarimetric current sensor using the Faraday effect. The system is powered by 1550 nm light, and the magneto-sensitive element is a fiber optic coil made of single-mode fiber. The analysis of the influence of disturbances on the sensor's operation in the basic configuration was made. The change in the parameters of the light wave depending on the induced damaging birefringence of the linear and circular birefringence resulting from the Faraday effect is presented.
The results of measurements of sinusoidal alternating currents with mains frequency in the amplitude range from 100 A to 1000 A are presented. Metrological analysis of the sensor was made. The sensitivity of the measurement system was determined and the uncertainty of the current measurement was estimated using a fiber optic polarimetric sensor, the value of which does not exceed 2%.