Magnetic field sensor based on concatenation of fiber peanut and long-period fiber grating with resolved temperature cross sensitivity

A compact dual-parameter sensor based on a fiber-optic interferometer consisting of a peanut fiber taper and a long-period fiber grating integrated with magnetic fluids has been proposed and experimentally demonstrated. By employing a sensor matrix containing distinct magnetic field intensity and temperature sensitivities of different interference dips, simultaneous dual-parameter measurement could be achieved.