A single-end coated reflective long-period fiber grating sensor and its manufacturing process and steel corrosion monitoring method

Abstract

The invention discloses a reflective type long-cycle fiber grating sensor with single-end film plating and a manufacturing technology and a reinforcement corrosion monitoring method thereof, and belongs to the technical field of structure engineering and optical fiber sensing. The manufacturing technology comprises the following steps of by utilizing the sensitivity of single-end reflective type long-cycle fiber grating on environment refractive rate, sealing the single-end reflective type long-cycle fiber grating by cement mortar, fixing on a reinforcement cage, periodically observing the resonance peak of reflective spectrum by a grating demodulator, judging the change of refractive rate around the grating, and determining the degree and rate of reinforcement corrosion. The manufacturing technology has the advantages that by monitoring the resonance peak of the reflective spectrum of the buried single-end reflective type long-cycle fiber grating, the corrosion condition of any model of reinforcement in a reinforced concrete member can be monitored for a long time under any environment at the premises of no damage to the surface of concrete, and the degree and rate of reinforcement corrosion can be accurately determined; the manufacturing technology is applied to the detection and evaluation of durability of reinforced concrete structure in the field of structure engineering.

Description

technical field [0001] The present invention relates to the field of structural engineering and optical fiber sensing technology, and mainly relates to a single-end reflective long-period optical fiber grating sensor for steel corrosion monitoring, and in particular to a single-end coated reflective long-period optical fiber grating sensor Its manufacturing process and steel bar corrosion monitoring method. Background technique [0002] Reinforced concrete structures are more and more widely used due to their good durability, but when they work in erosive environments such as seawater, the steel bars in the 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. Sa...

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Problems solved by technology

[0007] Aiming at the problem of low monitoring sensitivity in steel bar corrosion monitoring existing in the prior art

The invention proposes a single-end coating reflective long-period fiber grating sensor, its manufacturing process and steel bar corrosion monitoring method, which judges the corrosion degree of the steel bar by monitoring the change of the reflection spectrum wavelength of the sensor probe, and adopts the plexiglass material Fixing the sensing probe theoretically solves the problem of temperature compensation of fiber gratings affected by multiple parameters in practical applications, and does not need to use expensive and heavy detection equipment such as broadband light sources and spectrometers, further solving the problem of ordinary long-period fiber grating sensing application restrictions

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