▎ 摘　　要

NOVELTY - The utility model claims an optical fibre hydrogen sensor based on cursor effect high sensitive and fast response, wherein it comprises a broadband light source, an optical fibre spectrometer, 2 asterisk 2 optical fibre coupler, a first FP cavity interferometer and a second FP cavity interferometer. the first FP cavity interferometer is composed of a single-mode optical fibre, a hollow optical fibre, a graphene film and a palladium film sequentially the second FP cavity interferometer is composed of a single-mode optical fibre, a hollow optical fibre and a single-mode optical fibre sequentially the first FP cavity interferometer is set as the sensing cavity, the second FP cavity interferometer is set as the reference cavity. When the free spectral range generated by the first FP cavity interferometer and the second FP cavity interferometer is similar but not equal, the vernier effect can be generated. based on the vernier effect can realize high-sensitive measurement, using palladium film and graphene film can realize fast response. The utility model has strong practicability, compact structure, high sensitivity, fast response speed and so on.