Abstract
An all-fiber magnetic-field sensor combining a multicore fiber taper and magnetic fluid is proposed and experimentally demonstrated. The magnetic-field sensing mechanism is investigated theoretically and experimentally. Experimental results demonstrate that the dip-wavelength of the proposed sensor regularly varies with the changes of the applied magnetic field. The measuring sensitivity is achieved to be ~34 pm/Gs in the magnetic induction intensity range of 50–300 Gs. Moreover, the sensor responding to the 50-Hz alternating magnetic field is also experimentally investigated, and a minimal detectable magnetic induction intensity of ~23.7 Gs is successfully achieved. The proposed magnetic field sensor is attractive due to its compact size, low cost, and immunity to electromagnetic interference.
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