Abstract
This work presents a magnetic field sensor based on a Fabry–Perot interferometer (FPI) doped with a magnetic fluid. The FPI consists of multiple reflective end surfaces. The tail end of the FPI is wrapped with a magnetic fluid, and the external magnetic field adjusts the complex refractive index of the magnetic fluid, which influences the reflectivity of the tail end face of the interferometer and influences the spectral interferogram. The sensor possesses a small size, ease of fabrication, and potential for multiplexing. Additionally, a dual-wavelength intensity demodulation method is employed, which reduces the system cost compared to the spectrometer measurements approach. The measurement accuracy can achieve a value of 2.62 Gs under weak magnetic fields. According to the experimental results, the measurement range can span from 0 to 150 Gs, with a sensitivity of 4.58×10−5 mw/mT.
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