3 a magnetic field sensor based on the combination of nano magnetic fluid and interference type integrated optical waveguide is proposed. In this paper, we simulate and analyze the law of the resonant wavelength with the change of the magnetic field, and get the relationship between the magnetic field intensity and the resonant wavelength, and realize the magnetic field measurement. The simulation results show that the resolution of the magnetic field sensor is 0.183 Oe. With a small size, easy to integrate and the characteristics of the array, in the field of measuring the usefulness of a certain application prospects.
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