Fig. 1. Schematic diagram of temperature-insensitive magnetic field sensing system based on vernier effect

Fig. 2. Schematic diagrams of signal processing during demodulation. (a) Magnetic field demodulation; (b) temperature demodulation

Fig. 3. Frequency response and time response of sensing system. (a) Frequency response; (b) time response

Fig. 4. Superimposed spectra. (a) Magnetic field demodulation signal; (b) temperature demodulation signal

Fig. 5. Results of the magnetic field experiment. (a) Frequency shifts of FPI 1 interference spectra under different magnetic fields; (b) frequency shifts of FPI 2 interference spectra under different magnetic fields; (c) frequency shifts of envelope signal under different magnetic fields; (d)‒(f) relationships between magnetic field and frequency corresponding to Figs. 5(a)‒(c)

Fig. 6. Results of the temperature experiment. (a) Frequency shifts of FPI 3 interference spectra under different temperatures; (b) frequency shifts of FPI 4 interference spectra under different temperatures; (c) frequency shifts of envelope signal under different temperatures; (d)‒(f) relationships between temperature and frequency corresponding to Figs. 6(a)‒(c)