Method for monitoring steel bar corrosion state in concrete by stages and sensor

A steel bar corrosion and concrete technology, which is applied in the directions of transmittance measurement, phase influence characteristic measurement, optical test defect/defect, etc., can solve the problem that LPFG transmission resonance spectrum parameters cannot be obtained, the state of steel bar corrosion cannot be truly reflected, and the effective monitoring time of sensors is shortened and other problems, to achieve high resolution, overcome the influence of unstable light source, and prolong the effective working time
CN101566580AInactive Publication Date: 2009-10-28NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2009-10-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for monitoring steel bar corrosion state in concrete by stages and a sensor, and belongs to the field of tests of civil engineering sensors. The method comprises two stages for monitoring the steel bar corrosion state, namely an initial stage of steel bar corrosion for monitoring Cl content and a stage for monitoring the content of liquid rust nearby the steel bar during rusting; therefore, the method prolongs the effective working time of a steel bar corrosion sensor. The sensor comprises a sleeve, a fiber bracket and an LPFG sensing probe, wherein the sleeve is provided with a hole; the fiber bracket is arranged in the sleeve; the LPFG sensing probe is freely and straight arranged on the fiber bracket; and a monitoring medium is filled in the sleeve.
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Description

technical field

[0001] The invention relates to a stage-by-stage monitoring method and a sensor for the corrosion state of steel bars in concrete, belonging to the field of civil engineering sensor testing. Background technique

[0002] Long-period fiber grating (hereinafter referred to as LPG) is a sensing grating based on the coupling theory of core guided mode and cladding mode. concentration. The biological and chemical sensing technology based on this coupling theory has been widely used in many biochemical research fields such as the measurement of antigen content in blood, the identification of protein substances, drug screening, the detection of solution concentration, and the determination of the degree of degradation of sewage.

[0003] With the wide application of reinforced concrete structures in large-scale construction projects, the corrosion of steel bars in concrete has become the most important disaster that threatens the durability of reinforced concrete s...

Claims

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