▎ 摘　　要

NOVELTY - The utility model claims alcohol concentration optical fibre sensor based on graphene oxide is composed of tungsten, a spectrophotometer, a multimode fiber, a computer, a cuvette, wherein multi-mode optical fiber comprises a double tapered optical fibre sensing structure, double-tapered optical fibre sensing head is coated with graphene oxide film. graphene oxide film, because the surface has a very regular honeycomb-shaped structure so that the material easily absorbing organic molecules. graphene oxide film absorbing ethanol molecules expansion, releasing the deswelling, the corresponding refractive index will be changed. light after passing through the double-tapered optical fibre sensing head, light of multiple mode leakage, high-order-mode light due to the change of the external refractive index and fibre core refractive index between leak in different degrees, part of the mode light is difficult to satisfy the total reflection condition by monitoring the transmitted fluorescent light is strong, and it can obtain the refractive index variation, so as to detect the change of the external concentration, to detect alcohol concentration provides a feasible solution.