▎ 摘　　要

NOVELTY - The device has a device main body provided with an ASE light source (1), an optical fiber isolator (2), a first single-mode optical fiber (3), a sensing probe (4), a second single-mode optical fiber (5) and a spectrograph (6). The sensing probe is welded with the first single-mode optical fiber and a thin-core optical fiber by an optical fiber fusion splicer. Fiber stripping pliers remove the thin-core optical fiber. A gold film is coated on the thin-core optical fiber. A graphene covers above the gold film. Magnetic sensitive material is coated on the graphene, where central wavelength of the ASE light source is about 1550nm. USE - SPR based high-sensitivity magnetic field sensor device. ADVANTAGE - The device transmits received signal light to the sensing probe, receives change of external magnetic field by the sensing probe so as to change refractive index of magnetic fluid, realizes changing of a surface plasmon resonance condition caused by a drift transmission spectrum, and achieves high-sensitivity magnetic field sensing. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a SPR based high-sensitivity magnetic field sensor device. ASE light source (1) Optical fiber isolator (2) Single-mode optical fibers (3,5) Sensing probe (4) Spectrograph (6)