▎ 摘　　要

NOVELTY - The method involves obtaining a graphene photon crystal optical fiber and two single mode fibers. An outer surface of the graphene photon crystal optical fiber is welded with end parts of the single mode fibers by utilizing an optical fiber fusion conic clinker to perform tapering process. A graphene photon crystal optical fiber is coated with fused graphene nanometer layer. The fused graphene nanometer layer is dipped in 0.785g/ml of isopropyl alcohol solution and graphene dispersion liquid mixture according to 0.5 to 1.5: 300 to 600 mass ratio. USE - Method for manufacturing small volume and light weight graphene photon crystal optical fiber gas sensor. ADVANTAGE - The method enables realizing graphene photon crystal optical fiber gas sensor manufacturing process in an easy manner so as to reduce graphene photon crystal optical fiber gas sensor manufacturing cost and graphene photon crystal optical fiber gas sensor damage rate, thus increasing graphene photon crystal optical fiber gas sensor detection sensitivity and reducing graphene photon crystal optical fiber gas sensor responding time consumption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a small volume and light weight graphene photon crystal optical fiber gas sensor (2) a hydrogen sulfide gas concentration detecting method. DESCRIPTION OF DRAWING(S) - The drawing shows a photograph view of a graphene photon crystal optical fiber gas sensor.