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Multi-layer electromagnetic shielding pulse far-field eddy current detection sensor

A technology for detecting sensors and far-field eddy currents, which is applied in the direction of material analysis, instruments, and measuring devices by electromagnetic means. It can solve the problems of unfavorable movement of U-shaped structure devices, increase detection, and difficulties, so as to increase the shielding effect and improve the strength. , detect the effect of deep depth

Inactive Publication Date: 2019-01-25
四川沐迪圣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the U-shaped structure device is not conducive to movement. In addition, the existing devices that use magnetic shielding to generate far-field eddy current signals on the flat plate are usually separated from the excitation coil and the detection coil, and are not integrated together, which increases the difficulty of detection.

Method used

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  • Multi-layer electromagnetic shielding pulse far-field eddy current detection sensor
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  • Multi-layer electromagnetic shielding pulse far-field eddy current detection sensor

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Embodiment

[0034] In order to better illustrate the technical effect of the present invention, a separate excitation coil sensor without a shielding structure is used for comparison with a multi-layer electromagnetic shielding pulse far-field eddy current detection sensor with a three-layer shielding structure of the present invention. Figure 4 It is the actual picture of the multi-layer electromagnetic shielding pulse far-field eddy current detection sensor in this embodiment. Such as Figure 4 As shown, the parameters of each component of the multi-layer electromagnetic shielding pulse far-field eddy current detection sensor in this embodiment are as follows:

[0035] The excitation coil 1 is made of copper enameled wire, the wire gauge is 30, the number of turns is 400 turns, and the inner diameter is d 11 = 12mm, outer diameter d 12 = 16mm, height h 1 = 10 mm. A separate excitation coil sensor without shielding structure has the same parameters as excitation coil 1.

[0036] Th...

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Abstract

The invention discloses a multi-layer electromagnetic shielding pulse far-field eddy current detection sensor. Three layers of shielding layers made from high-magnetic-permeability high-conductivity materials are used between an excitation coil and a detection coil to serve as an isolation device for direct coupling energy, so that the direct coupling energy is bound in the shielding layers. Indirect coupling energy outside the shielding layers account for a main part. Far-field signals can be detected through the detection coil. The three-layer electromagnetic shielding device is used, and afar-field eddy current phenomenon is generated in a ferromagnetic flat plate, so that the detection depth is larger, and detection of sub-surface defects is achieved.

Description

technical field [0001] The invention belongs to the technical field of far-field eddy current nondestructive testing, and more specifically relates to a multi-layer electromagnetic shielding pulse far-field eddy current testing sensor. Background technique [0002] Non-destructive testing refers to the premise of not damaging the internal structure of the workpiece under test, using some physical and chemical methods to detect the workpiece, and then evaluate its performance. Eddy current testing is the most common testing method in nondestructive testing, and has been favored by scholars at home and abroad for its advantages of no contact, no couplant, and low cost. Far-field eddy current technology is a type of eddy current technology. It was first discovered in the detection of pipelines. It means that far-field eddy currents will be generated at a distance of 2 to 3 times the inner diameter of the pipeline from the excitation coil. Usually, the energy generated by the ex...

Claims

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Application Information

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IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 高斌杨昌荣
Owner 四川沐迪圣科技有限公司
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