▎ 摘　　要

NOVELTY - The utility model claims a three-core staggered optical fibre humidity sensing system, belonging to the field of optical fibre sensing; Compared with other humidity sensing system, the utility model has high sensitivity, simple structure, low cost, capable of compensating the temperature, fast response speed, strong anti-electromagnetic interference ability and so on; The utility model comprises a broadband light source, a single-mode optical fibre, an optical fibre staggered structure, a fibre Bragg grating, a spectrometer; wherein the optical fibre dislocation structure is composed of multi-mode optical fibre and three-core optical fibre staggered fusion; the surface is coated with a layer of graphene, optical fibre dislocation structure as the main sensing part and the external action, then the optical fibre Bragg grating for temperature compensation, finally the spectrograph to obtain the interference spectrum after sensing; when the external environment changes, graphene absorbs moisture in the air to change the effective refractive index of the optical fiber dislocation structure, so as to change the spectrum after sensing so as to perform humidity sensing.