Apparatus and method for defect detection of steel structure on the basis of eddy-current heating deflection spectroscopy

Abstract

The invention provides an apparatus for defect detection of steel structure on the basis of eddy-current heating deflection spectroscopy. The apparatus includes: an induction heating power supply, a coil, a laser emitter, a laser receiving screen, a plurality of laser position sensors and an analyzer. The induction heating power supply is connected to the coil. The coil is arranged at a preset distance from a protective layer surface of a steel structure. The laser emitter and the laser receiving screen are respectively arranged at two sides of a zone between the coil and the protective layersurface. The laser emitter is faced to the laser receiving screen. The laser position sensors are paved on the laser receiving screen. The laser receiving screen is connected to the analyzer. In the apparatus, by means of difference of temperature changes between a defect position and a non-defect position on the steel structure under eddy-current heating, defect detection on the surface of the steel structure inside the protective layer can be completed without damage on the steel structure and the protective layer thereon. Meanwhile, because photo-thermal deflection effect is very sensitive,even a small temperature change can be detected, thus reducing eddy-current heating powder and greatly reducing weight and energy consumption of the apparatus.

Description

technical field [0001] The invention relates to the technical field of safety monitoring, in particular to a steel structure defect detection device and method based on eddy current heating deflection spectrum. Background technique [0002] Steel structures mainly include steel bars, section steel, cables, steel bridge decks, reinforced concrete structures, steel pipe concrete structures, etc., which are common building materials and engineering projects in civil engineering. Because of its light weight, high rigidity and high output, it has been widely used in the field of civil engineering. [0003] However, due to unqualified welding, poor construction technology, raw material defects, serious corrosion and other reasons, the steel structure has defects in the raw material stage, construction period or operation period, and the section is incomplete, which cannot guarantee the bearing capacity and safety of the structure. Necessary casualties and economic losses. Howeve...

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Problems solved by technology

[0003] However, due to unqualified welding, poor construction technology, raw material defects, serious corrosion and other reasons, the steel structure has defects in the raw material stage, construction period or operation period, and the section is incomplete, which cannot guarantee the bearing capacity and safety of the structure. Necessary human casualties and economic losses

However, since the surface of the steel structure usually has a protective layer, the defects on the surface of the steel structure cannot be directly observed by the naked eye.

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