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An Experimental Study on Linearity of a Magnetooptic Crystal Sensor Using YIG in Magnetic Field Measurement

Different from the conventional magnetic field sensor based on Hall effect, Faraday effect based magneto-optic crystal sensors (MOSs) not only can be used to measure magnetic fields but also have the features of high insulation and insensitivity to electromagnetic interference. In this paper, we investigated linearity of a MOS using an yttrium iron garnet (YIG) in magnetic field measurement at room temperature. Comparing with those measured by a Hall effect sensor, from accuracy and repeatability points of view, the test results show that the YIGMOS has a good linearity in magnetic field measurement from 0 to 22 mT. Furthermore, this study could pave the way for the next work on measuring magnetic fields of HTS magnets through using a YIG-MOS at low temperature.