UV SENSOR BASED ON ETCHED-FBG AND AZOBENZENE POLYMER

摘要

The present invention relates to an ultraviolet ray sensor based on an etched optical fiber Bragg grating and an azobenzene polymer, which improves a reaction velocity as to an ultraviolet ray and a recovery velocity to an initial value in case the ultraviolet ray disappears, as maintaining the function of the ultraviolet ray sensor based on an optical fiber grating coated with the conventional azobenzene polymer as it is, by forming an etching area in a fixed section along the length direction of an optical fiber and then forming an optical reaction part by coating an azobenzene polymer on the etching area. The ultraviolet ray sensor based on an etched optical fiber Bragg grating and an azobenzene polymer according to the present invention includes an optical fiber which has a fiber Bragg grating (FBG) formed in the etching area as including the etching area; and the azobenzene polymer for inducing a tensile force in the fiber Bragg grating when exposed to an ultraviolet ray by being coated in the etching area of the optical fiber in the state of surrounding the fiber Bragg grating. Here, the etching area is formed by etching a whole cladding or a part of a core of a fixed section along the length direction of the optical fiber.