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Double-layer magnetic shielding type rectangular eddy current sensor

An eddy current sensor, magnetic shielding technology, applied in the direction of instruments, scientific instruments, material magnetic variables, etc., can solve the problems of poor lateral sensitivity and weak detection signal, and achieve the effect of reducing loss, improving detection signal strength, and high lateral sensitivity

Pending Publication Date: 2021-01-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to design a double-layer magnetically shielded rectangular eddy current sensor to solve the problems of weak detection signal and poor lateral sensitivity of conventional eddy current sensors

Method used

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  • Double-layer magnetic shielding type rectangular eddy current sensor
  • Double-layer magnetic shielding type rectangular eddy current sensor
  • Double-layer magnetic shielding type rectangular eddy current sensor

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.

[0033] Based on the principle of magnetic shielding and electromagnetic induction, a double-layer magnetic shielding rectangular eddy current sensor is designed. Using this sensor to detect groove defects on the surface of stainless steel plates, it can obtain higher detection signal strength and higher detection signal strength than conventional eddy current sensors. Lateral detection sensitivity.

[0034] The structure diagram of the double-layer magnetically shielded rectangular eddy current sensor is figure 1 shown. The sensor includes an inner shielding shell 1 , an outer shielding shell 2 , a rectangular exciting coil 3 and a rectangular receiving coil 4 . The detection object is a stainless steel plate wit...

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Abstract

The invention discloses a double-layer magnetic shielding type rectangular eddy current sensor which is composed of a double-layer magnetic shielding shell made of ferrite, a rectangular columnar exciting coil and a rectangular columnar receiving coil, wherein the rectangular columnar exciting coil and the rectangular columnar receiving coil are formed by winding copper wires. According to the sensor, the characteristic that the rectangular columnar coil can generate a larger magnetic field and more concentrated eddy current is utilized, the rectangular columnar coil is used as an exciting coil and a receiving coil, and a double-layer magnetic shielding shell is designed to guide magnetic field distribution based on a magnetic shielding principle, so that the magnetism gathering effect isenhanced, and the defect that the rectangular columnar coil is low in exciting eddy current intensity is overcome. Therefore, the transverse resolution of the sensor is improved while the strength ofa detection signal is enhanced, transverse thickness measurement of the groove-shaped defects on the surface of the test piece can be realized under certain conditions, and the sensor has certain application value.

Description

technical field [0001] The invention relates to a double-layer magnetically shielded rectangular eddy current sensor, which belongs to the field of electromagnetic non-destructive testing, and can measure the transverse thickness of groove defects on the surface of stainless steel plates while ensuring a certain detection signal strength. Background technique [0002] Stainless steel is widely used in many fields such as aerospace, food and chemical industry because of its good corrosion resistance, non-magnetic properties, and strong toughness. Due to the influence of temperature and alternating loads during service, stainless steel plates are prone to defects such as cracks, corrosion, and delamination. In order to ensure the safety of the stainless steel plate structure, it is necessary to carry out non-destructive testing and structural health monitoring. Eddy current testing is based on the change of electromagnetic properties of materials, and is used for defect detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 刘增华陈政宇赵欣何存富吴斌
Owner BEIJING UNIV OF TECH
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