▎ 摘　　要

NOVELTY - The utility model claims a methane detecting device based on graphene, comprising a sealed gas chamber, a broadband light source, a single mode fibre, a 3dB coupler, a graphene-edge filter, micro-nano optical fibre grating, PIN avalanche diode, collecting card; amplifying circuit and computer, the graphene micro-nano optical fibre grating is installed in the sealed air chamber, the broadband light source through the single-mode optical fibre is connected with the 3dB coupler, the 3dB coupler connected by the single mode optical fibre and the graphene micro-nano optical fibre grating, the 3dB coupler is connected with the edge filter, PIN avalanche diode, a collecting card, an amplifying circuit and a computer are orderly connected through data wire; the graphene micro-nano optical fibre grating comprises a micro-nano optical fibre, which are symmetrically arranged on the two ends of the micro-nano optical fiber light core, covered on the light core of the optical fibre cladding and a graphene on the micro optical fiber.