Fig. 1. Sensor structure and its schematic diagram

Fig. 2. Model of dual-optical path method demodulation method. (a) Structure diagram of dual-optical path method; (b) schematic diagram of dual-optical path method Faraday rotation angle calculation

Fig. 3. Reflective fiber-optic magnetic field sensor measurement system based on magneto-optical crystal and fiber grating

Fig. 4. Principle of FBG temperature demodulation. (a) Schematic diagram of FBG temperature sensing experiment; (b) grating reflection spectrum and narrowband light source spectrum at different temperatures

Fig. 5. Relationship between temperature and total reflected light intensity

Fig. 6. Relationship between external temperature and experimental measurements of LV

Fig. 7. Sensor unit package structure

Fig. 8. Temperature field simulation results of sensor at 0, 113, 291, and 360 s and temperature response curves of different components

Fig. 9. Schematic diagram of sensor test system

Fig. 10. Direct current response characteristic curve of sensor

Fig. 11. Frequency response characteristics of sensor

Fig. 12. Direct current magnetic field input-output characteristics of sensors at different temperatures

Fig. 13. Compensated relative error values at different temperatures

Fig. 14. Temperature characteristic test curves of sensors under industrial magnetic field

Fig. 15. Comparison of sensor performance under direct current magnetic field