Dedicated Metal Detector for Buried Corroded Pipelines
A technology for metal detectors and pipelines, applied in amplifiers with semiconductor devices/discharge tubes, electric/magnetic exploration, geophysical surveys, etc., can solve problems such as difficult to distinguish between normal pipelines and rusted pipelines
Active Publication Date: 2019-05-17
TSINGHUA UNIV
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Problems solved by technology
[0003] Based on this, it is necessary to solve the problem that traditional buried pipeline monitoring devices are difficult to distinguish between normal pipelines and corroded pipelines, and to provide a rusted pipeline detector for buying ground
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[0044] In order to make the purpose, technical solutions and technical effects of the present invention clearer, specific embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0045] The metal shell of the buried pipeline is mostly made of iron, and after a long period of burial, the iron will undergo electrochemical or chemical reactions with the surrounding environment, changing the original chemical, mechanical, physical and other characteristics. This phenomenon is called iron corrosion. . Both industrial media and the natural environment can rust iron. When iron is rusted, iron atoms change into an ionic state, which significantly reduces mechanical properties such as plasticity, strength, and toughness. In addition to the different history, the forms of iron rust ...
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A metal detector for buried and corroded pipeline is provided, comprising: a transmitting coil configured to transmit a detection signal to a pipeline; a frequency selection unit electrically connected to the transmitting coil for regulating a frequency of the detection signal; two receiving coils respectively and symmetrically disposed at two opposite sides of the transmitting coil for respectively receiving a reflected signal returned from the pipeline; an analog-digital conversion unit respectively and electrically connected to the two receiving coils for converting the reflected signal into a digital signal; and a control unit electrically connected to the analog-digital conversion unit. In the present disclosure, by comparing intensities of the reflected signals received by the two receiving coils, it can be efficiently and accurately determined whether corrosion has occurred to the pipeline.
Description
technical field [0001] The invention relates to the field of material detection, in particular to a special metal detector for buried rusted pipelines. Background technique [0002] In the process of municipal construction, the buried pipelines in many places are seriously corroded due to the long time and lack of maintenance. Although buried pipeline locations are documented, corrosion is difficult to detect at low cost due to the high cost of excavation. And the general detection device, it is difficult to distinguish the normal pipeline and the rusted pipeline. SUMMARY OF THE INVENTION [0003] Based on this, it is necessary to provide a land-buying rusted pipeline detector for the problem that the traditional buried pipeline monitoring device is difficult to distinguish between normal pipelines and corroded pipelines. [0004] A special metal detector for buried corroded pipes, including: [0005] A frequency selection unit for adjusting the frequency of the detecti...
Claims
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IPC IPC(8): G01V3/08
CPCG01V3/08G01V3/104H03F1/34H03F3/45475H03F2200/129H03F2200/141H03F2200/534H03F2200/541H03F2203/45116H03F2203/45518H03F2203/45526H03F2203/45528G01V3/165H03B5/32H03F3/45071
Inventor 郑小平杨叶青耿华
Owner TSINGHUA UNIV