Gross-volume monitoring sensing device for corrosion states and temperature field states of reinforcing steel bars in concrete

Abstract

The invention discloses a gross-volume monitoring sensing device for the corrosion states and the temperature field states of reinforcing steel bars in concrete, and a monitoring device with the gross-volume monitoring sensing device. The gross-volume monitoring sensing device comprises a broadband light source, a Y-shaped optical fiber coupler, a coupler connector, a sensing optical fiber, an LPFG (Long Period Fiber Grating) reinforcing steel bar corrosion sensing probe, an LPFG temperature sensing probe, an optical switch, a spectrograph and a computer, wherein the broadband light source enters the input end of the Y-shaped optical fiber coupler, is transmitted to the output end of the Y-shaped optical fiber coupler, is further transmitted to the LPFG reinforcing steel bar corrosion sensing probe and the LPFG temperature sensing probe respectively through the coupler connector and the sensing optical fiber, passes the optical switch, enters the spectrograph through the outgoing end of the optical switch, and is finally processed by the computer; then a curve of relationship between a transmitted spectrum and the corrosion states is output. By utilizing the device, the gross-volume monitoring on the corrosion states and the temperature field states of the reinforcing steel bars in the concrete can be realized.

Description

technical field [0001] The invention relates to a full-volume monitoring sensing device for steel bar corrosion state and temperature field state in concrete and a monitoring device including the same, 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. It is very sensitive to the change of the refractive index of its surrounding environment, and then can obtain the 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 structur...

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Problems solved by technology

[0011] Purpose of the invention: To overcome the shortcomings of the original concrete steel bar corrosion monitoring sensor that cannot realize the full volume monitoring of steel bar corrosion, simultaneous monitoring of corrosion state and temperature field, temperature compensation function, etc., and provide a highly sensitive, quasi-distributed on-line measurement A full-volume monitoring sensor device for the corrosion state of steel bars in concrete and a temperature field state for overall monitoring of steel bars and a monitoring device including it

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