Method and apparatus for concrete damage detection based on impedance imaging

Abstract

This invention relates to a method and apparatus for concrete damage detection based on impedance imaging, which comprises the following steps: (1) setting multiple electrodes on target; (2) connecting the excitation input ports of former electrodes to the multi-way input switch; (3) forcing the drive sine current to every two electrodes by turns, measuring the current amplitudes and phases; (4) computing resistance distribution in the concrete; (5) acquiring and storing computation data to compare with given data for analysis.

Description

technical field [0001] The invention belongs to the field of damage detection of concrete components, in particular to a method and equipment capable of real-time monitoring of the internal conditions of concrete components. Background technique [0002] Health diagnosis and damage detection of concrete components have an important impact on the development of the national economy and people's lives. The technology of health diagnosis and damage detection of concrete components is one of the main problems that need to be overcome in the world today. [0003] At present, the methods used to detect internal defects in concrete mainly include ultrasonic testing, radar testing and optical fiber sensing testing, among which ultrasonic testing is the most widely used. [0004] The basic principle of ultrasonic testing is to compare the relative changes of parameters such as sound velocity, amplitude and frequency when the ultrasonic pulse passes through the defect or damage, and c...

AI Technical Summary

Problems solved by technology

In view of its detection principle, there are the following problems: (1) An antenna must be used to approach the detection object during this detection operation, so the detected area is small. If the entire concrete structure is to be fully detected, each area must be scanned in turn, resulting in a large amount of detection work. (2) When used for internal defect detection, it is required that the dielectric constants of two adjacent substances differ greatly in order to obtain enough reflected energy to form a radar image. For environments with high conductivity, such as humid environments, the resolution is very high Low; (3) The detection depth is limited, so real-time monitoring cannot be realized, and the development of fractures cannot be predicted

[0006] For optical fiber sensing and detection, the optical fiber must be embedded in advance, so it can only detect cracks at the position where the optical fiber is embedded

In addition, in actual engineering applications, the severe environmental conditions of concrete construction pose a great threat to the survival of precise and thin sensing optical fibers

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