Ferromagnetic thin-walled tube circumferential AC magnetization magnetic flux leakage detection array probe

A technology of magnetic flux leakage detection and array probes, which is applied in the direction of material magnetic variables, can solve problems such as difficulty and noise control, and achieve the effects of reducing influence, improving magnetic field uniformity, and enhancing anti-interference ability

Inactive Publication Date: 2016-07-27
CHINA NUCLEAR POWER OPERATION TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many bends in the pipeline of nuclear power plants, the noise caused by mechanical rotation and the difficulty of control make it not optimal to use mechanical rotation

Method used

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  • Ferromagnetic thin-walled tube circumferential AC magnetization magnetic flux leakage detection array probe
  • Ferromagnetic thin-walled tube circumferential AC magnetization magnetic flux leakage detection array probe
  • Ferromagnetic thin-walled tube circumferential AC magnetization magnetic flux leakage detection array probe

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Such as figure 1 — Figure 5 As shown, the array probe for the circumferential AC magnetization flux leakage detection of ferromagnetic thin-walled pipes of the present invention includes two rows of giant magnetoresistance sensors 1 and excitation coils 2 uniformly distributed along the circumference of the pipe; each row of giant magnetoresistance sensors 1 and excitation coils The coils 2 are arranged at intervals, and the giant magnetoresistive sensors 1 and excitation coils 2 in the two rows are arranged alternately. The excitation coil 2 is a shaft-wound coil.

[0023] When detecting the pipeline, firstly excite the two adjacent excitation coils 2 on the first row of coils, and then realize the sequential excitation of other excitation coils 2 of this row of coils. After the sequence has completed the single row of coils (clock...

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Abstract

The invention belongs to the technical field of nuclear power station ferromagnetic thin-walled tube inward-passing electromagnetic nondestructive test and other ferromagnetic thin-walled tube electromagnetic nondestructive test and relates to a ferromagnetic thin-walled tube circumferential AC magnetization magnetic flux leakage detection array probe. The array probe comprises two rows of giant magneto resistive sensors and excitation coils uniformly distributed along a pipe circumferential direction, in each row, the giant magneto resistive sensors and excitation coils are arranged at intervals and the giant magneto resistive sensors and excitation coils in the two rows are staggered. When a pipe is detected, the two adjacent excitation coils in the first row of the coils are excited, then other excitation coils in the first row are orderly excited, after all the coils in the single row are excited, the two excitation coils in the second row close to the excitation coils in the first row are excited and then other excitation coils in the second row are orderly excited. The array probe realizes detection of small caliber sample pipe axial defects.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic non-destructive testing of ferromagnetic thin-wall in-penetration of nuclear power plant and other electromagnetic non-destructive testing of ferromagnetic thin-wall, and specifically relates to an array probe for circumferential AC magnetization magnetic flux leakage detection of ferromagnetic thin-wall tubes. Background technique [0002] The electromagnetic detection method of ferromagnetic tubes in nuclear power plants mainly uses far-field eddy current at this stage. The far-field eddy current has a certain sensitivity and resolution for the detection of defects, but due to the magnetic saturation method of the permanent magnet, its magnetization cannot be adjusted, which may lead to insufficient magnetization, so that the residual magnetic field of the ferromagnetic tube interferes with the detection signal , In addition, the far-field eddy current adopts more axial excitation, that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/87
Inventor 祁攀邵文斌崔洪岩廖述圣
Owner CHINA NUCLEAR POWER OPERATION TECH
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