▎ 摘　　要

NOVELTY - The sensor has a photonic crystal optical fiber (PCF) sensor main body provided with a photonic crystal optical fiber (1), a sensing area (3) of graphene coating gold film and a to-be-tested liquid area (4). A side surface of the PCF sensor main body is coated with a certain thickness of the gold film as the sensing area. The graphene coating gold film is coated on a surface of the gold film. A sensing layer is formed for measuring a to-be-measured medium. A surface of the photonic crystal optical fiber is coated with graphene for increasing sensitivity of the sensor. USE - Double core double-side throwing type photon crystal optical fiber-Surface plasmon resonance (PCF-SPR) sensor. ADVANTAGE - The sensor has simple structure, small volume, high sensitivity and better sensing characteristic, and increases contact surface of the to-be-tested solution, and enhances leakage of an enhanced fiber core evanescent field, and improves sensitivity of the sensor, and realizes measurement of the refractive index of the to-be-measured liquid by the sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a double core double-side throwing type photon crystal optical fiber-Surface plasmon resonance sensor. Photonic crystal optical fiber (1) Air hole (2) Sensing area (3) To-be-tested liquid area (4)