High-fidelity extraction method of heat transfer tube damage information based on multi-frequency eddy current complex signal
A high-fidelity information extraction method technology, applied in the field of heat transfer tube damage information extraction based on multi-frequency eddy current signals, can solve the problems of two-dimensional eddy current signal deformation, large errors, and large workload calculations
Active Publication Date: 2022-06-28
RES INST OF NUCLEAR POWER OPERATION +1
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However, since this method changes the ratio of the real and imaginary parts of the defect or wear, the derived two-dimensional eddy current signal is seriously deformed, resulting in a large error in the measurement of the depth and width of the defect or wear, which needs to be calibrated continuously through the measurement data of the calibration tube , a large amount of calculation, poor automatic processing performance, and large errors
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[0086] Example The following notepad file (DCR007C025I136.txt) comes from the data measured by an eddy current detector in a nuclear power plant. The data format is shown in Table 1. In the Matlab software environment, the download drawing statement can be used to obtain image 3 . Channel These 16 columns show the signal in this graph, and a signal of a suspected defect was found around 5700. Here, signals with real and imaginary parts between 4500 and 7500 are shown for 4 differential channels at frequencies 170kHz, 100kHz, 50kHz and 25kHz, see Figure 4 . It can be seen that the signal mutation of the differential channel with a frequency of 170kHz and the differential channel 3 with a frequency of 100kHz near 5700 becomes very weak in the differential channel with a frequency of 50kHz and the differential channel with a frequency of 25kHz. It is intuitively judged that there may be a flaw.
[0087] Intercept the 5500-5800 data in the differential channel with a frequenc...
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The invention belongs to the technical field of eddy current detection, in particular to a high-fidelity extraction method for heat transfer tube damage information based on multi-frequency eddy current complex signals. Obtain the multi-frequency eddy current signal data matrix to determine the canceled channel and the canceled channel, and then extract the paired real and imaginary part signals of the above channels in the detection area, parallel cancel to obtain four corresponding phasors, and binary Dimension similarity processing, the similarity processing results sR and sI are represented by Lissajous diagram. Based on the parallel cancellation + two-dimensional similar frequency mixing method, the extracted defect information is superior to the traditional frequency mixing method in terms of amplitude and phase fidelity, which improves the accuracy of defect depth and height detection; using this method to detect defect signals can Expand the detection range, simplify the signal calibration steps, reduce manual operations, and facilitate the realization of automatic signal detection.
Description
technical field [0001] The invention belongs to the technical field of eddy current detection, in particular to a method for extracting damage information of a heat transfer tube based on a multi-frequency eddy current signal. Background technique [0002] The evaporator heat transfer tubes of nuclear power plants are usually composed of dozens or even hundreds of tubes of the same material and specifications. The flow of liquid medium inside the tubes and the external vibration cause wear and corrosion to the contact parts between the support plate and the outer wall of the heat transfer tubes. The strong electromagnetic signal induced by the traditional single frequency eddy current test support plate drowns out the response signal caused by the defect at this position. [0003] At present, the multi-frequency eddy current detection method can eliminate the interference signal of the support baffle. However, since this method changes the ratio of the real and imaginary pa...
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IPC IPC(8): G01N27/90
CPCG01N27/9046
Inventor 廖述圣张益成冯美名张志义魏文斌陈姝张文哲
Owner RES INST OF NUCLEAR POWER OPERATION