A sensor for monitoring the corrosion state of steel bars, its manufacturing process, and a method for monitoring steel bar corrosion

Abstract

The invention discloses a sensor for monitoring the corrosion state of reinforcing steel bars, a production process of the sensor and a monitoring method for the corrosion of the reinforcing steel bars, belonging to the technical fields of structural engineering and optical fiber sensing. The sensor comprises long-period optical fiber grating sensing; the long-period optical fiber grating sensing comprises an optical fiber grating section, an optical fiber section and a tail end section; the sensor further comprises a base, the reinforcing steel bars and cement mortar; the optical fiber grating section, the optical fiber section and the tail end section are sequentially arranged from left to right; a layer of optical fiber grating section metal film is arranged on the surface of the optical fiber grating section; a layer of tail end section metal film is arranged on the surface of the tail end section; a layer of tail end section end face metal film is arranged on the end face of the tail end section; both the reinforcing steel bars and the long-period optical fiber grating sensing are placed in the base; a layer of cement mortar is arranged outside the base. The optical fiber grating section metal film, the tail end section metal film and the tail end section end face metal film are palladium metal film respectively. The change of surrounding environment of the reinforcing steel bars is monitored by a single-end reflective long-period optical fiber grating through a refractive index, thereby judging the corrosion state of the reinforcing steel bars.

Description

technical field [0001] The invention relates to the technical fields of structural engineering and optical fiber sensing, in particular to a sensor for monitoring the corrosion state of steel bars, a manufacturing process thereof and a method for monitoring steel bar corrosion. Background technique [0002] Nowadays, reinforced concrete structures are used more and more widely due to their good durability, but when they work in erosive environments such as seawater, the steel bars in reinforced concrete structures are prone to corrosion. The problem of corrosion of steel bars will not only bring immeasurable economic losses to the society and waste resources and materials, but also reduce the service life of steel bars and their load-bearing capacity to a certain extent, damage the structure of reinforced concrete, and even affect personal health. Safety. Therefore, the research on the corrosion of steel bars has important theoretical and practical significance. At present...

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Problems solved by technology

Its weak point is: 1) in this invention, the state of steel bar corrosion is monitored by the micro-bending characteristic of grating, and the micro-bending of grating caused by steel bar corrosion is the early and middle stage of steel bar corrosion, and this method can't detect the early stage of steel bar corrosion. Carry out monitoring and early warning in advance; 2) This invention needs to use large-scale expensive equipment such as broadband light sources and spectrometers for regular monitoring, which is inconvenient to use and high in cost

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