| Abstract |
In this paper, a high dynamic, high precision optical current measurement system based on the Faraday-effectis presented. First, the sensor concept is explained and different sensor constructions are analyzed. Then, animplementation of the concept based on a rare-earth iron garnet film is investigated. This measurement system usesmultiple signal processing channels to increase the signal-to-noise ratio. Furthermore, the range of the rotation ofthe polarization plane exceeds 90° and therefore requires a counting mechanism to count the number of rotations.Finally, the precision of the presented system is analyzed. The precision is determined to be 4.9 ppm for a rotationrange of 3300°. |
