▎ 摘　　要

NOVELTY - A gas-sensitive optical fiber sensor comprises broadband light source (1), polarizer (2), test gas chamber (3), D-type photonic crystal optical fiber (4), single-mode optical fiber (5), spectrum analyzer and computer. The optical fiber sensor is located in test gas chamber. The test gas chamber is provided with inlet and outlet for controlling carbon tetrafluoride gas. The side polishing surface of D-type photonic crystal optical fiber is coated with platinum composite graphene film. The single-mode optical fiber is welded with D-type photonic crystal optical fiber. The D-type photonic crystal optical fiber is coated with platinum composite graphene film to form probe of gas-sensitive optical fiber sensor. USE - Gas-sensitive optical fiber sensor for judging a deterioration degree of an insulating material in a gas insulated system (GIS). ADVANTAGE - The sensor has high sensitivity, flexible design, compact structure, strong stability and wide application value in judging deterioration degree of insulating material. DESCRIPTION OF DRAWING(S) - The drawing shows a diagram of the gas-sensitive optical fiber sensor for judging deterioration degree of insulating material in geographic information system. Broadband light source (1) Polarizer (2) Test gas chamber (3) D-type photonic crystal optical fiber (4) Single-mode optical fiber (5)