Magnetic field intensity sensing system based on magnetic current body and tilted fiber bragg grating

The utility model discloses a magnetic field intensity sensing system based on magnetic current body and tilted fiber bragg grating, by broadband light source, polarization controller, optical circulator, single mode fiber, photonic crystal optic fibre, tilted fiber bragg grating, the magnetic current body, magnetic field generator, gaussmeter and fiber optic spectrometer constitute. One section photonic crystal optic fibre through corroding in the butt fusion before tilted fiber bragg grating to at its inside magnetic current body of filling, both as the carrier of the magnetic current body, also improved the coupling efficiency that the cladding mode reflects back the fibre core, constitute a novel structure's high sensitivity optic fibre magnetic field sensing system. Change when external magnetic field intensity, the effective refractive index of the magnetic current body changes thereupon, and quantity each numerous rank cladding mode directly has taken place the effect with the magnetic current body, ob