▎ 摘　　要

NOVELTY - The system has a light source, a single-mode optical fiber, a photodetector and a display device. A transverse groove is provided in the length direction of the single-mode optical fiber. The two end faces in the longitudinal direction of the transverse groove and the end faces of the single-mode fiber sequentially form a first reflecting surface M1, a second reflecting surface M2, and a third reflecting surface M3. A first resonant cavity C1 is formed between M1 and M2, and a second resonant cavity C2 is formed between M2 and M3. The light source enters the end of the single-mode fiber coated with graphene through the coupler. The coupler is also connected to a photodetector, and is connected to the display device. USE - Microstructure optical fiber gas detection system based on cursor effect. ADVANTAGE - The gas detection system changes the change of the external gas concentration to cause the change of the reflectivity of the optical fiber. The gas detection system can realize the real-time detection of the gas to be fixed. The anti-interference ability of the gas detection system is strong and the sensitivity of the gas detection system is high. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the microstructure optical fiber gas detection system. (Drawing includes non-English language text)