▎ 摘　　要

NOVELTY - The system has a graphene microsphere cavity (2), a micro-nano optical fiber (3) and a clamp (4) that are all placed in a vacuum cavity (1). A tunable narrow-linewidth laser (5) sends out a pumping optical signal, and the optical signal is transmitted from the first port of a single-mode circulator (7) to the second port after passing through a polarization controller (6) and enters the micro-nano fiber. The optical signal transmitted through the micro-nano fiber is coupled into the graphene microsphere cavity. The graphene microsphere cavity generates multi-order Brillouin signals, and the even-order Brillouin signals are output to a 2×2 single-mode coupler (8) along with the forward optical signal. The 2×2 single-mode coupler couples the forward optical signal and the reverse optical signal to the photodetector (9) and the spectrum analyzer (11). The photodetector is connected to the spectrum analyzer (10). USE - Multi-parameter gas sensing system based on graphene-sphere cavity used for detecting concentration of gas small molecule. Can also be used in gas chromatography, electrochemical and photoelectron detection based on new material. ADVANTAGE - The multi-parameter gas sensing system has high sensitivity, fast response time and small volume. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the multi-parameter gas sensing method of multi-parameter gas sensing system based on graphene-sphere cavity. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of multi-parameter gas sensing system based on graphene microsphere cavity. 1Vacuum cavity 2Graphene micro-ball cavity 3Micro-nano optical fiber 4Clamp 5Tunable narrow line width laser 6Polarization controller 7Single-mode circulator 8Single-mode coupler 9Photodiode detector 10Spectrum analyzer 11Spectrum analyzer