Optical fiber sensor for simultaneously monitoring stress and corrosion rate of reinforcing steel bar

Abstract

The invention belongs to the technical field of structural health monitoring or sensors, and discloses an optical fiber sensor for simultaneously monitoring stress and corrosion rate of reinforcing steel bars. The optical fiber sensor comprises a transmission optical fiber, a capillary reinforcing steel bar pipe, a long-period fiber grating, a flexible waterproof sealing material, an external bushing, a reflecting mirror surface, a connecting key and a clamp. According to the invention, the sensor comprehensively utilizes a Fabry-Perot resonator and a long-period fiber grating, indirectly monitors the stress and corrosion rate of reinforcing steel bars by simultaneously monitoring the change of reflection spectrum signals of the Fabry-Perot resonator and the long-period fiber grating under different reinforcing steel bar corrosion rates and reinforcing steel bar stress conditions, can realize long-term, lossless and real-time simultaneous monitoring of the stress and the corrosion rate of the reinforcing steel bars, is high in measurement precision and large in measuring range, has the advantages of being relatively simple to manufacture, small in size, high in strength, high in sensitivity and the like, has a wide application prospect, and is easy to popularize.

Description

technical field [0001] The invention relates to an optical fiber sensor for simultaneously monitoring steel bar stress and corrosion rate, and belongs to the technical field of structural health monitoring or the technical field of sensors. Background technique [0002] As one of the most widely used civil engineering materials in the world today, steel bars have many advantages such as high strength, high plasticity and toughness, and are easy to manufacture. Its high tensile properties can well adapt to the high compressive properties of concrete. important reason for its widespread use. [0003] However, due to the working nature of civil engineering structures during their service, they are very easily exposed to corrosive environments, such as marine environments such as docks, seaports, and cross-sea bridges. Even if it is only a civil engineering structure working in an ordinary atmospheric environment, with the passage of service time, the development of concrete cr...

AI Technical Summary

Problems solved by technology

However, the above methods generally have disadvantages such as inconvenient operation, complicated monitoring process, and not suitable for monitoring steel corrosion in civil engineering structures.

At present, the monitoring method of steel bar stress mainly uses the steel bar stress gauge to complete the measurement of steel bar stress, but it has the disadvantages of complicated installation and limited range.

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