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A Method of Improving the Limit Sensitivity of Eddy Current Detection for Metal Surface Cracks

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 between noise and interference signals, inability to detect, and weak eddy current signals, and achieve the effect of improving the limit sensitivity

Active Publication Date: 2016-01-13
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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  • A Method of Improving the Limit Sensitivity of Eddy Current Detection for Metal Surface Cracks
  • A Method of Improving the Limit Sensitivity of Eddy Current Detection for Metal Surface Cracks

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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 the limit sensitivity of eddy current detection of metal surface cracks, which is based on the fact that in eddy current detection, the surface crack defects of metal materials cannot change abruptly, their positions are constant, and they extend according to a certain rule. And the characteristics of the random change of the noise interference signal, using the three-dimensional time window time-based memory line signal three-dimensional imaging display? way, by calibrating the signal within the time window? The eddy current detection signal scanned multiple times and imaged can read the tiny crack defect information that cannot be detected by conventional eddy current detection, which effectively improves the limit sensitivity of eddy current detection, and is suitable for metal surface cracks with high detection sensitivity and precision requirements Defect detection work.

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 Patents(China)
IPC IPC(8): G01N27/90G01N27/9013
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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