Steel corrosion sensor based on photonic crystal optical fiber probe

Abstract

The invention belongs to the technical field of sensors, and discloses a steel corrosion sensor based on a photonic crystal optical fiber probe. The steel corrosion sensor comprises a single-mode optical fiber and a photonic crystal optical fiber, wherein the single-mode optical fiber comprises a fiber core, a cladding and a coating layer; and the photonic crystal optical fiber comprises a fiber core, a cladding, cladding air holes and an iron film. The excited state cladding mode of the photonic crystal optical fiber of the sensor is highly sensitive to a refractive index of an external medium, the surrounding refractive index of the iron film similar to main components of steel can be changed after the iron film is corroded, and the corrosion condition of the steel is indirectly and effectively monitored by monitoring the external refractive index of the crystal fiber in real time. The steel corrosion sensor has the advantages of being simple to manufacture, small in size, high in strength, high in sensitivity and the like, can effectively realize nondestructive, real-time and accurate measurement of the corrosion condition of steel in constructional engineering, and has a wide application prospect.

Description

technical field [0001] The invention relates to a steel corrosion sensor based on a photonic crystal optical fiber probe, which belongs to the field of structural health monitoring, and is especially used for corrosion monitoring of steel in reinforced concrete structures and steel structures. Background technique [0002] Steel is one of the commonly used engineering materials in building structures, such as steel bars in reinforced concrete structures, profiled steels in rigid structures, and steel structures, all of which are made of steel. Corrosion of steel is one of the important factors affecting the durability of these building structures. Every year in my country, there are many accidents of building structure damage and even collapse caused by steel corrosion, resulting in huge economic losses and casualties. Therefore, it is necessary to effectively monitor the corrosion of steel in the building structure, strengthen and repair the damaged structure in time, and ...

AI Technical Summary

Problems solved by technology

However, the traditional optical fiber sensor for monitoring steel corrosion has problems such as long monitoring period, low monitoring sensitivity and low monitoring accuracy.

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