Smart monitoring technique of concrete structures based on optical fiber bragg grating sensors

According to the particular requirements of internal strain monitoring of concrete structures, fiber Bragg grating (FBG) is encapsulated in mental capillary tube to serve the purpose. The sensing properties of the encapsulated FBG are studied and the solutions to embedment into concrete for FBGs are also explored. Then, the cure process of cement paste and the deformation of steel reinforced concrete beams under loading are monitored with both encapsulated FBG and bare FBG Sensors. Finally, FBGs sensors are successfully applied in the Heida Niutoushan concrete structure bridge.