Magnetic localization logging device based on optical fiber weak magnetic field sensing

The invention provides relates to the field of optical fiber sensing technology, in particular to a magnetic localization logging device based on optical fiber weak magnetic field sensing. The magnetic localization logging device comprises an optical fiber sensing light source, a polarization controller, an optical fiber circulator, an optical fiber FBG F-P magnetic sensitive sensor which are sequentially connected, wherein the optical fiber circulator is connected with an optical fiber coupler, the optical fiber coupler is respectively connected with a Faraday rotator mirror I, a phase modulator and a photoelectric detector, the phase modulator is connected with a Faraday rotator mirror II, and the photoelectric detector, an A/D data acquisition card and an embedded CPU processor are sequentially connected. The magnetic localization logging device can achieve the magnetic localization logging under harsh environments of high temperature, high pressure, strong electromagnetic interference and the like, measur