Image fusion-based metal magnetic material defect detection device

A technology of metal magnetism and material defects, applied in the direction of material magnetic variables, etc., can solve the problems of strong leakage magnetic field signal, weak leakage magnetic field signal, long detection time, etc., to increase penetration depth, eliminate static interference, and enhance magnetic leakage signal. Effect

Active Publication Date: 2018-06-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] Among the above methods, the high-frequency excitation has weak detection ability to internal defects due to the skin effect of eddy current, and the leakage magnetic field signal generated is weak.
Static excitation can only detect defects in a single directi

Method used

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  • Image fusion-based metal magnetic material defect detection device
  • Image fusion-based metal magnetic material defect detection device
  • Image fusion-based metal magnetic material defect detection device

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Embodiment Construction

[0027] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0028] The metal magnetic material defect detection device based on image fusion of the present invention is divided into a hardware module and a software module, wherein the hardware module includes an excitation signal circuit and a magneto-optical imaging system, and the software module includes a fusion algorithm module. Each module will be described in detail below in conjunction with the accompanying drawings

[0029] 1. Exciting signal circuit

[0030] In this example, if figure 1 As shown, the excitation signal circuit includes a function generator 101 and two bri...

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Abstract

The invention discloses an image fusion-based metal magnetic material defect detection device. Sine and cosine signals are applied to two pairs of mutual vertical U-shaped magnet yokes correspondingly, and a rotating magnetic field, of which the synthesis direction is uniformly changed along with time and the amplitude is not changed, serves as an excitation magnetic field for detection of a metalmagnetic material test piece. If the defect exists in the metal magnetic material test piece, a leakage magnetic field is generated above the defect, the leakage magnetic field information is converted into a magneto-optical image through a magneto-optical imaging system, a frequency domain image of a magneto-optical image sequence is normalized, linear weighted fusion is conducted, the image isconverted within the gray value range, and the defect image of the metal magnetic material test piece is acquired. A magnetic field excitation test piece is rotated by low frequency being below 50 Hz,the defect in each direction can be effective excited, the magneto-optical image in single excitation period is acquired by a magneto-optical imaging technology, the defect in each direction is subjected to linear weighted fusion in the frequency domain, and rapid visual detection of the defect in each direction is realized.

Description

technical field [0001] The invention belongs to the technical field of defect detection, and more specifically relates to a metal magnetic material defect detection device based on image fusion. Background technique [0002] In the defect detection of metal magnetic materials, magneto-optic imaging (MOI) technology combined with magnetic flux leakage detection has been rapidly developed because of its visualization, rapidity and accuracy. Based on the Faraday effect, the magneto-optical imaging detection technology converts the leakage magnetic field that reflects the defect information (the leakage magnetic field information generated by the defect) into light intensity information, that is, the leakage magnetic field image. By analyzing the leakage magnetic field image, the defect detection is realized, and then the The state of health of metallic magnetic materials. [0003] Among them, magnetic flux leakage testing is a traditional nondestructive testing technology, whi...

Claims

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Application Information

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IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 程玉华王永刚张杰白利兵于海超史帅刘琪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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