Effect of temperature on characteristics of rare earth-doped magneto-optical glass in optical current transducer application

First, a theoretical analysis was performed on the effect of temperature and on the performance of the sensing element of rare earth-doped magneto-optical glass material that can be used in an optical current transducer application. The effect comprises two aspects: the linear birefringence and the Verdet constant. On this basis, rare earth-doped glass temperature characteristics were studied, and the experimental results indicated that the linear birefringence of rare earth-doped glass increased with increasing temperature, while its magneto-optical sensitivity decreased. Comparative experiments performed for various concentrations of rare-earth dopant in the glass revealed that changes in the dopant concentration had no significant effect on the performance of magneto-optical glass.