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  • Title: Ampere force based magnetic field sensor using dual-polarization fiber laser.
    Author: Cheng L, Guo Z, Han J, Jin L, Guan BO.
    Journal: Opt Express; 2013 Jun 03; 21(11):13419-24. PubMed ID: 23736594.
    Abstract:
    A magnetic field sensor is proposed by placing a dual-polarization fiber grating laser under a copper wire. With a perpendicular magnetic field applied, an electrical current flowing through the copper wire can generate Ampere force to squeeze the fiber grating laser, resulting in the birefringence change inside the laser cavity and hence the change of the beat note frequency. When an alternating current is injected into the copper wire, the magnetic field induced beat note frequency change can be discriminated from environment disturbances. A novel fiber-optic magnetic field sensor is therefore demonstrated with high sensitivity and inherent immunity to disturbances.
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