▎ 摘　　要

NOVELTY - The sensor has a laser light source (1) in which light is emitted into a single-mode optical fiber (2), and passes through a first single-mode photonic crystal fusion ball (3). A portion of the light enters a cladding of a photonic crystal fiber (4), and portion of the light continues to transmit in a core. An interference is formed when the light is coupled in a second single-mode photonic crystal fusion ball (5). The graphene film (8) adsorbs the sucrose molecules in a solution when a sensing area is immersed in the sucrose solution in a water tank (6). The graphene film and the cladding of the photonic crystal fiber are considered as a whole, and effective refractive index changes. The sucrose concentration is determined by shifting the interference trough by demodulating a spectrum analyzer. USE - Graphene-coated spherical spliced photonic crystal fiber based sucrose sensor used in biological science, environment detection and other subject field, for measuring concentration. ADVANTAGE - The optical fiber has low loss, strong anti-interference ability, corrosion resistance, low cost, and sucrose is the most common edible sugar, life is necessary to the sucrose detection, so the sensor has profound research significance and wide application prospect. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the graphene-coated spherical spliced photonic crystal fiber based sucrose sensor. Laser light source (1) Single-mode optical fiber (2) First single-mode photonic crystal fusion ball (3) Photonic crystal fiber (4) Second single-mode photonic crystal fusion ball (5) Water tank (6) Spectrum analyzer (7) Graphene film (8)