Method for improving detection limiting sensibility of crack eddy current on surface of metal

An eddy current detection and metal surface technology is applied in the field of improving the limit sensitivity of eddy current detection of metal surface cracks, which can solve the problems of inability to distinguish noise interference signals, weak eddy current signals, and inability to detect, and achieve the effect of improving the limit sensitivity

Active Publication Date: 2013-12-18
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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Problems solved by technology

[0002] The eddy current detection method is a common detection method for detecting cracks on the metal surface. Due to the signal noise interference caused by the internal circuit of the electronic instrument and external electromagnetic interference, the conventional eddy current detection method has a certain limit sensitivity and can only detect cracks on the metal surface at a certain depth. , smaller than its depth, the eddy current signal of the crack defect is extremely weak and cannot be distinguished from the noise interference signal, so the conventional eddy current testing method cannot be detected

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  • Method for improving detection limiting sensibility of crack eddy current on surface of metal

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Embodiment Construction

[0015] Such as figure 1 , figure 2 The embodiment shown is a method for improving the limit sensitivity of eddy current detection of metal surface cracks, which is characterized in that: based on eddy current detection, the surface crack defects of metal materials cannot be mutated, the position is constant and extends according to a certain law, and the noise interference signal changes randomly The characteristics of the detection method include the following steps,

[0016] a. Set the signal display mode of the eddy current detector to the three-dimensional time window time base memory line signal three-dimensional imaging display mode, that is, the eddy current detection time base signal is displayed and retained in the three-dimensional time window, and the x-axis of the three-dimensional time window is the signal time The x(t), y-axis is the probe translation distance x(h) perpendicular to the scanning direction, and the z-axis is the signal amplitude x(v);

[0017] b...

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Abstract

The invention discloses a method for improving detection limiting sensibility of a crack eddy current on the surface of metal. Based on the characteristics that the crack defect on the surface of a metal material during eddy current detection can not be broken, the position is constant and extends according to a certain rule and a noise interference signal randomly changes, by adopting a three-dimensional imaging display mode of a time base memory line signal of a three-dimensional time window, through calibrating eddy current detection signals of multiple times of scanning in the signal time window and imaging the eddy current detection signals, small crack defect information which can not be detected by conventional eddy current detection can be read, thus the eddy current detection limit sensibility is effectively improved. The method is suitable for detection of the crack defect on the surface of the metal with high detection sensibility and precision requirement.

Description

Technical field [0001] The invention relates to a non-destructive testing method, in particular to a method for improving the limit sensitivity of eddy current detection of metal surface cracks. Background technique [0002] The eddy current detection method is a common detection method for detecting cracks on the metal surface. Due to the signal noise interference caused by the internal circuit of the electronic instrument and external electromagnetic interference, the conventional eddy current detection method has a certain limit sensitivity and can only detect cracks on the metal surface at a certain depth. , smaller than its depth, the eddy current signal of the crack defect is extremely weak and cannot be distinguished from the noise interference signal, so the conventional eddy current testing method cannot be detected. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for im...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90G01N27/9013
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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