Stay cable defect detection system based on electromagnetic wave transmission line theory and detection method thereof

Abstract

The invention provides a stay cable defect detection system based on an electromagnetic wave transmission line theory and a detection method thereof. The whole structure design of the stay cable defect detection system is simple; no high precision equipment or instrument is needed, the hardware equipment cost is low; the detection operation is simple and convenient; a high frequency excitation source is adopted to generate high frequency electromagnetic guided waves for detection, the effective detection range is largely enlarged, and moreover, the high frequency electromagnetic guided waves have the advantages of good stability and strong performance on resisting interference. The stay cable defect detection system is combined with the detection method, a stay cable does not need to be scanned and probed by detection equipment, no radiation pollution is generated; and the detection is simple and rapid, and is barely influenced by environmental factors such as temperature, humidity, and the like. The detection results can be used to precisely determine the positions of defects in a detected stay cable, the damage degrees of defects in the stay cable can be objectively represented, and the system and the method are worthy to popularize therefore.

Description

technical field [0001] The invention belongs to the technical field of cable structure safety monitoring, and in particular relates to a cable defect detection system and a detection method based on microwave transmission line theory. Background technique [0002] With the rapid development of the transportation industry, cables are widely used in bridges. However, due to rain and wind, the cables will be damaged by corrosion and broken wires, which poses a great hidden danger to the safety of bridges. In order to avoid the hidden dangers caused by the damage and defects of the cables, it is necessary to regularly detect and maintain the defects of the cables. [0003] At present, the methods for testing the corrosion of the cable are: (1) Manual detection method, mainly through manual inspection whether the cable system is corroded, whether the cable body is damaged, and regularly paints the various parts of the cable body with protective paint, and timely checks the rusted...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a cable defect detection system based on the electromagnetic wave transmission line theory, which can use the transmission line theory to The high-frequency electromagnetic pulse excitation signal respectively excites the detected cable and the cable external power line arranged in parallel with it, so that an edge is generated between the cable external power line to which the electromagnetic pulse excitation signal is applied and the detected cable. The electromagnetic guided wave propagating in the extension direction of the cable is used to detect the defect of the cable, so as to solve the problem that the system equipment and operation process of the defect detection of the cable in the prior art are complicated, the detection accuracy is insufficient, and it is difficult to apply to the real-time detection of the defect of the cable. long-term monitoring

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