▎ 摘　　要

NOVELTY - The sensor has a sensor unit provided with a substrate, an input optical fiber, an output optical fiber and a graphene thin film cover. The input optical fiber is fixed with a micro-ring structure and fixed on the substrate. The micro-ring structure is fixed with a remote end of the graphene thin film cover. A tail end of the input optical fiber is connected with the output optical fiber that is fixed with the substrate. Diameter of a head section of the input optical fiber is about 125 um. Diameter of a tail section of the input optical fiber is about 2 to 3 um. USE - Graphene thin film cover annular optical fiber gas sensor. ADVANTAGE - The sensor is simple to manufacture, convenient to assemble and easy to adjust, and has high sensitivity, stability and response speed and low production cost, and occupies less space. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a graphene thin film cover annular optical fiber gas sensor.