Ferromagnetic pipeline tiny defect magnetic detection sensor

A sensor and magnetic detection technology, which is applied in the direction of material magnetic variables, can solve the problems of small permanent magnets to reduce the magnetization magnetic field strength, reduce the amount of information of the detection sensor, and low detection accuracy, so as to optimize the magnetization effect, strengthen the detection effect and sensitivity, high precision effect

Inactive Publication Date: 2020-02-11
BEIHANG UNIV
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Problems solved by technology

First of all, the small permanent magnet reduces the intensity of the magnetizing magnetic field, which can only ensure the inner wall of the magnetized pipeline, thereby reducing the amount of information acquired by the detection sensor; secondly, the magnetic field detection part only uses a single coil or Hall element, and the acquired signal The amount of information is less, and the detection accuracy is lower

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  • Ferromagnetic pipeline tiny defect magnetic detection sensor
  • Ferromagnetic pipeline tiny defect magnetic detection sensor
  • Ferromagnetic pipeline tiny defect magnetic detection sensor

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the following examples are intended to facilitate the understanding of the present invention, and have no limiting effect on it. For convenience of description, the present invention will be described below by taking an oil stealing hole as an example. It should be understood that the present invention can also be applied to defect detection of non-pipe ferromagnetic materials.

[0030] Such as figure 1 As shown, the ferromagnetic pipeline micro-defect magnetic detection sensor of the present invention is in the shape of a cuboid as a whole and its lower surface is in an arc consistent with the curvature of the pipeline wall, so as to better approach or even fit the pipeline wall during the detection process. It should be understood that it can The invention detects the radian of the lower surface of the sensor according to the ...

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Abstract

The invention discloses a ferromagnetic pipeline tiny defect magnetic detection sensor. The detection sensor is integrally cuboid, and the lower surface of the detection sensor is in an arc shape consistent with the radian of the wall of a pipeline. The magnetic detection sensor comprises an arched excitation part, a circuit part and a detection part, the circuit part and the detection part are arranged in the arched cavity of the arched excitation part, and the circuit part is arranged between the arched excitation part and the detection part. According to the invention, an excitation devicewith a large volume in a traditional magnetic flux leakage detection device is simplified into the excitation part of the sensor, the integration of the excitation part and the detection part is achieved, and the implementation mode of the detection part is designed, so that the acquired magnetic field signal information amount is larger and more accurate.

Description

technical field [0001] The invention belongs to the field of detection in pipelines and the technical field of magnetic detection, and in particular relates to a magnetic detection sensor for micro-defects in ferromagnetic pipelines. Background technique [0002] Magnetic flux leakage detection technology is the longest research time, the most widely used and the most mature in-pipeline detection technology. This technology is suitable for the identification and quantification of metal pipeline surface and internal defects. It is easy to operate, high in reliability, and has no special requirements for the detection environment. . [0003] Magnetic flux leakage detection technology is based on the high permeability of ferromagnetic materials. After the ferromagnetic tube wall is magnetized by a magnetizing device, if the material of the tube wall is continuous and uniform, the magnetic field lines will be bound in the tube wall, and it can be considered that there is almost...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 郑德智刘晓林王帅
Owner BEIHANG UNIV
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