▎ 摘　　要

NOVELTY - The method involves measuring the magnitude of the external magnetic field by monitoring the change in the response spectrum characteristics. The resonant frequency range of the graphene grating structure is determined according to the material preparation process and the working frequency band of the detector. The geometric parameters of the graphene grating structure are selected according to the resonance frequency. A magnetic field is applied to the graphene grating structure, the variation of the response spectrum of the grating structure is calculated under different magnetic field strengths, and a model corresponding to the magnetic field strength and the response spectrum characteristics is established. USE - Magnetic field detection method based on graphene grating structure for target detection, geomagnetic navigation, biological medicine and other fields. ADVANTAGE - The method measures the size of the magnetic field with high efficiency and high sensitivity by monitoring the change of the response spectrum. DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of graphene grating structure.