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Detection system of metal surface defect and detection method thereof

A metal surface and defect detection technology, applied in measuring devices, instruments, material analysis by electromagnetic means, etc., can solve problems such as inability to distinguish between inner and outer wall defects

Active Publication Date: 2015-08-05
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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  • Claims
  • Application Information

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Problems solved by technology

The magnetic flux leakage internal detection method can only realize defect detection, and cannot distinguish inner and outer wall defects

Method used

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  • Detection system of metal surface defect and detection method thereof
  • Detection system of metal surface defect and detection method thereof
  • Detection system of metal surface defect and detection method thereof

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Embodiment Construction

[0021] figure 1 It is a schematic diagram of the detection system of the present invention, which consists of a controller 1, two power amplifier circuits 2, two differential coil probes 3, two signal processing circuits 4, an analog multiplexer and an analog-to-digital converter 5, etc. The modules form a detection system, in which the power amplifier circuit 2, the differential coil probe 3, and the signal processing circuit 4 form an eddy current detection module in one-to-one correspondence, that is, an eddy current detection module equipped with 2 channels; the controller 1, the analog multiplex switch and the analog-to-digital conversion The device constitutes a data acquisition module. The eddy current detection module outputs a DC voltage signal that corresponds intuitively to the surface defects of the detected metal and can be captured at a lower sampling speed, and the data acquisition module performs A / D conversion, acquisition and output of the signal. 1 controll...

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Abstract

The invention discloses a detection system of metal surface defects and a detection method thereof. In the method, a square signal and a control signal, which is sent to a signal treatment circuit, are generated through a controller. A power amplification circuit excites an exciting coil to generate an eddy current effect on a to-be-test metal surface. An inductive signal generated in a first detection coil and a second detection coil in a probe of a differential coil is subjected to treatments of difference forming, amplification, wave filtering and peak value maintenance through the signal treatment circuit, and then a DC voltage signal is outputted. The position of the probe of the differential coil is moved. The whole process is repeatedly performed for carrying out scanning detection to the to-be-test metal surface. By means of the detection system and the detection method, the metal surface defects can be detected at a low sampling speed with an intuitive detection result obtained, and meanwhile the detection method can be integrated with a magnetic flux leakage testing method to performing composite detection, thereby achieving difference of inner defects and outer defects of magnetic flux leakage testing of a pipeline.

Description

technical field [0001] The invention relates to the field of non-destructive testing of metal surface defects, in particular to a metal surface defect detection system and a detection method. Background technique [0002] In the field of metal surface or near-surface defect detection, the eddy current method is commonly used for detection. The alternating current is connected to the coil to generate an alternating magnetic field perpendicular to the metal workpiece. The surface of the workpiece induces an eddy current and generates a magnetic field opposite to the original magnetic field. If the metal workpiece has defects, the intensity and distribution of the eddy current field will be changed, making the coil Impedance changes, and detection of this change can determine whether there is a defect. Eddy current detection usually adopts impedance analysis method, which generally requires equipment with a high sampling rate to detect the induced voltage of the coil. The dete...

Claims

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Application Information

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IPC IPC(8): G01N27/90G01N27/83G01N27/9013G01N27/904
Inventor 熊鑫许振丰郑莉庞旭林高雯
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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