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Partial high-sensitivity eddy current detection sensor and detection method

An eddy current detection, high-sensitivity technology, used in instruments, measuring devices, scientific instruments, etc., can solve the problems of inability to meet the needs of weld inspection and low sensitivity, and achieve the effect of improving defect detection ability and local sensitivity.

Inactive Publication Date: 2018-03-27
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Eddy current testing technology is a commonly used product quality and safety testing technology in the industrial production process. For example, for the detection of surface defects of welded pipes, the detection of surface defects of welded pipe welds is the key work in the detection. Currently, for the detection of welded pipes, the external through-type eddy current is usually used. The sensor scans the surface defects of the welded pipe, but the existing external eddy current sensor cannot meet the detection requirements for the weld due to its low sensitivity. In actual detection, it is necessary to use a special surface scanning probe for the weld to detect the weld

Method used

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  • Partial high-sensitivity eddy current detection sensor and detection method
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  • Partial high-sensitivity eddy current detection sensor and detection method

Examples

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Embodiment 1

[0016] Embodiment one, such as figure 1 , figure 2 As shown, a local high-sensitivity eddy current detection sensor of an internal pass-through type includes an eddy current detection coil 1 and a bias core coil winding frame 21, which is characterized in that: the bias core coil winding frame 21 consists of a magnetic core bar 20 Combined with a coil winding bobbin 21, the cross section of the magnetic core bar 20 is smaller than the cross section of the coil winding bobbin 21, and the magnetic core bar 20 is embedded and fixed longitudinally on the peripheral surface of the coil winding bobbin 21 on the side away from the axis; the eddy current detection The coil 1 is wound and fixed on the outer peripheral surface of the bias core coil winding frame 21 in the circumferential direction.

[0017] Embodiment one, such as image 3 As shown, a detection method of an internally penetrating local high-sensitivity eddy current detection sensor uses the above-mentioned device to ...

Embodiment 2

[0018] Embodiment two, such as Figure 4 , Figure 5 , a local high-sensitivity eddy current detection sensor of an external penetration type, comprising an eddy current detection coil 1, a bias core coil winding frame 21, characterized in that: the bias core coil winding frame 21 consists of a magnetic core bar 20 and a The coil winding bobbin 21 is combined, the cross section of the magnetic core strip 20 is smaller than the cross section of the coil winding bobbin 21, and the magnetic core strip 20 is longitudinally embedded and fixed on the peripheral surface of the coil winding bobbin 21 on the side away from the axis; the eddy current detection coil 1 The circumferential winding is fixed on the outer peripheral surface of the bias core coil winding frame 21 .

[0019] Embodiment two, such as Figure 6 As shown, a detection method of an externally penetrating local high-sensitivity eddy current detection sensor uses the above-mentioned device to perform externally penet...

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Abstract

The invention discloses a partial high-sensitivity eddy current detection sensor and a detection method. The sensor is of offset magnetic core design, a magnetic core strip is fixed on one side surface inside an eddy current detection coil, then an alternating magnetic field within a partial range of one side surface of the eddy current detection coil at the magnetic core strip is converged and enhanced, a key part of a detected workpiece is subjected to specific high-sensitivity scanning, for example, for welding tube detection, since a weld joint is a key detection part, a weld joint defectsignal is generally covered by signals and cannot be recognized because of relatively low sensitivity when a common through eddy current detection coil is used, and by adopting the sensor disclosed bythe invention, the partial sensitivity of a weld joint scanning part in an eddy detection coil is improved, and the defect detection capability of weld joint parts is effectively improved.

Description

technical field [0001] The invention relates to a non-destructive testing device and method, in particular to a local high-sensitivity eddy current testing sensor and a testing method. Background technique [0002] Eddy current testing technology is a commonly used product quality and safety testing technology in the industrial production process. For example, for the detection of surface defects of welded pipes, the detection of surface defects of welded pipe welds is the key work in the detection. Currently, for the detection of welded pipes, the external through-type eddy current is usually used. The sensor scans the surface defects of the welded pipe, but the existing external eddy current sensor cannot meet the detection requirements for the weld due to its low sensitivity. In actual detection, it is necessary to use a special surface scanning probe for the weld to detect the weld . Contents of the invention [0003] The purpose of the present invention is to overcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 林俊明林发炳戴永红胡斌
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD