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Anti-crosstalk eddy current nondestructive flaw detection system based on magnetic sensing probe

A non-destructive flaw detection and detection system technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve problems such as being unsuitable for practical applications, troublesome in operation, complicated in structure, etc.

Pending Publication Date: 2021-09-14
HANGZHOU DIANZI UNIV
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Problems solved by technology

This method sets two auxiliary coils around each detection coil of the array probe, which makes the structure of the system more complicated, and in different application scenarios, it is necessary to adjust the magnetic field of the auxiliary coil to the detection coil by moving the metal slide on the auxiliary coil. The degree of weakening of the magnetic field, the operation is too troublesome, not suitable for practical application

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  • Anti-crosstalk eddy current nondestructive flaw detection system based on magnetic sensing probe
  • Anti-crosstalk eddy current nondestructive flaw detection system based on magnetic sensing probe
  • Anti-crosstalk eddy current nondestructive flaw detection system based on magnetic sensing probe

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] An anti-crosstalk eddy current nondestructive testing system based on a magnetic sensor probe includes a small-sized anti-crosstalk array probe with a magnetic shielding structure, a signal processing circuit and a host computer;

[0043] like figure 1 As shown, the array probe collects the analog voltage signal sent by the signal generation module, and the analog voltage collected by the array probe is transmitted to the data acquisition module after passing through the multi-channel signal conditioning module;

[0044] The signal generation module uses Direct Digital Synthesizer (DDS) to generate a sine wave signal. The clutter and some high-frequency signals generated during its output are filtered by a low-pass filter, and then the sine wave with a stable frequency The signal passes through the power amplifier chip to improve the dr...

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Abstract

The invention relates to an anti-crosstalk eddy current nondestructive flaw detection system based on a magnetic sensing probe. The array probe is composed of a plurality of probe units, and each probe unit is wrapped by a magnetic shielding cover and then is vertically arranged in a groove of an array framework; and analog voltage acquired by the probe array passes through a multi-path signal conditioning module, is automatically acquired by a data acquisition card and is then output to an upper computer so that a detection result is displayed. According to the invention, influence of the lift-off distance in eddy current nondestructive testing is effectively inhibited, the detection speed is high, the detection range is wide, the influence of mutual inductance between the probe units is effectively reduced, the anti-interference capability and the detection precision are improved, and finally, the detection result is displayed in real time by utilizing the upper computer, so that detected defect information can be more intuitively obtained.

Description

technical field [0001] The invention belongs to the technical field of eddy current detection, and relates to an anti-crosstalk eddy current nondestructive flaw detection detection system based on a magnetic sensor probe. Background technique [0002] Eddy current testing technology is a new comprehensive application science, it will not damage the performance of the measured object, widely used in engineering materials, parts and structural parts in aerospace, nuclear power, shipbuilding, transportation, petrochemical and other fields Valid inspection and testing. When an AC excitation signal is applied to the coil, an alternating magnetic field is generated around the coil and in the conductive medium. According to the principle of electromagnetic induction, a vortex-shaped electric field will be generated in the conductive medium, thereby forming a vortex-shaped current, that is, eddy current . If there is a defect on the surface of the conductor structure, it will caus...

Claims

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Application Information

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IPC IPC(8): G01N27/904
CPCG01N27/9006
Inventor 白茹汶思敏蓝天窦爱玉王杰李俊李志伟钱正洪
Owner HANGZHOU DIANZI UNIV
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