Structural Parameters on the Performance of Magnetic Field Sensor Based on Faraday Effect

The existing research direction focuses on non-metallic magnetic field sensors based on Faraday effect. The relationship between the structure and performance of such sensors is not clear. Therefore, this paper simulates the structural parameters of non-metallic magnetic field sensors based on Faraday effect. The main structures include magneto-optical crystals, polarizers and polarizers. The effects of the length of magneto-optical crystals, the initial angle between polarizers and polarizers, and the material of magneto-optical crystals on the range and sensitivity of magnetic flux leakage sensors are compared and analyzed. It is concluded that as the length of magneto-optical crystals decreases, the range increases, and the maximum range is 4 T when the initial angle between polarizers and polarizers is 45°. The range of magneto-optical crystal material TGG is 42.5% larger than that of TSAG, and the corresponding sensitivity is 60.3% smaller. In practical engineering, the selection of non-metallic magnetic field sensors with appropriate structural parameters is conducive to the use in scenarios requiring large range and high sensitivity.