Deep defect quantifying method based on eddy rotating probe signal

A technology of rotating probe and defect depth, which is applied in the field of nuclear power plant operation, can solve problems such as the inability to determine the defect depth, and achieve the effect of solving drift

Inactive Publication Date: 2015-07-01
CHINA NUCLEAR POWER OPERATION TECH +1
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an eddy current detection depth quantitative method for nuclear-grade heat transfer tube defects based on the eddy current rotating probe signal, so as to solve the problem that some special areas on the heat transfer tube, such as the transition zone of the expansion tube, exist The technical difficulty of not being able to determine the depth of the defect; at the same time, this method can also be used to quantify the depth of the defects existing in the entire pipe section of the heat transfer tube

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  • Deep defect quantifying method based on eddy rotating probe signal
  • Deep defect quantifying method based on eddy rotating probe signal

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] A defect depth quantification method based on eddy current rotating probe signal, comprising the following steps:

[0030] Step 1. Collect and calibrate defect impedance change vector signals

[0031] By setting calibration tubes with known heat transfer crack defects of artificially simulated steam generators, collecting calibration defect impedance change vector signals of these calibration tubes;

[0032] The defects are artificial electric spark grooves of different depths to simulate crack defects of actual heat transfer tubes;

[0033] Step 2. Defect signal differential processing

[0034] The differential processing calculation formula is as follows:

[0035] E. c (t)=E a (t)-E a (t+t 0 )

[0036] where E a (t) is the defect impedance change vector signal changing with time t; E a (t+t 0 ) for E a (t) after t 0 The defect impe...

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Abstract

The invention relates to a deep defect quantifying method based on an eddy rotating probe signal. The method comprises the steps of 1, acquiring a calibrated defect impedance variation vector signal; 2, performing differential treatment for the defect signal; 3, normalizing the signal; 4, forming a calibration quantifying curved line; 5, acquiring an actual signal; 6, performing deep defect quantifying for the actual signal through the calibration quantifying curved line. With the adoption of the method, the problem of failure of quantifying of a rotating probe can be solved; the algorithm transformation is performed to solve the drifting problem of an absolute signal.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant operation, in particular to a defect depth quantification method based on eddy current rotating probe signals. Background technique [0002] For the inspection of nuclear-grade heat transfer tubes, such as steam generator heat transfer tubes, due to the limitations of their structural characteristics and inspection technical conditions, the shaft-wound coil eddy current inspection technology is mainly used at present. Due to the phase angle of the response signal and the defect depth There is always a good correspondence between them, so the method of evaluating the depth of defects is usually adopted by the signal phase angle under the differential channel. However, if the shaft-wound coil is located in a region where the geometry changes greatly, such as in the transition zone of the expanded tube, there is a sudden change in the eddy current signal in the transition zone, and the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/26
Inventor 廖述圣韩捷冯美名崔洪岩邵文斌
Owner CHINA NUCLEAR POWER OPERATION TECH
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