Centering verification method for internal penetrating type eddy current detection probe
A technology of eddy current detection probe and calibration method, which is applied in the field of calibration, can solve the problem of whether the neutral is good or not and there is no related detection method, and achieve the effect of improving the production method and process, and effectively aligning the neutral
Active Publication Date: 2017-03-15
RES INST OF NUCLEAR POWER OPERATION +1
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Problems solved by technology
At present, the design and production process of the probe are relatively mature, and there is no relevant detection method and way for whether the neutral is good or not
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[0025] A method for verifying the neutrality of a penetrating eddy current detection probe, comprising the following steps:
[0026] Step 1: Define the number of alignment measurement points n, requiring the number of points to be greater than or equal to 4 and less than or equal to 10;
[0027] Step 2: Process through-holes in the calibration tube according to the number of measurement points n determined in step 1. The through-holes are evenly distributed along the circumference of the calibration tube. For example, when n is 4, the circumferential layout of the four through-holes is 0 degrees and 90 degrees. , 180 degrees, and 270 degrees. In the case of other points, the circumferential interval of each measurement point is divided by the number of points according to 360 degrees. Refer to figure 1 ;
[0028] Step 3: The axial distribution of through holes is not less than the detection sensitivity of the probe, or the spacing distance is greater than or equal to 10mm.
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The invention discloses a centering verification method for an internal penetrating type eddy current detection probe. The centering verification method comprises the following steps of 1, defining the number n of centering measuring points; 2, processing through holes in a calibrating tube according to the number n of the measuring points determined in the step 1, enabling the through holes to be peripherally distributed along the calibrating tube at even degrees; 3, enabling the axial distribution of the through holes to be not less than the detection sensitivity of the probe; 4, setting the sampling frequency, the acquisition speed and the number of channels; 5, acquiring an eddy current signal of the whole calibrating tube, wherein the eddy current signal comprises a difference channel signal; 6, calibrating the eddy current signal acquired in the step 5, wherein the calibrating comprises phase position normalization and amplitude normalization; and 7, choosing the difference channel signal in the eddy current signal acquired in the step 5, measuring the eddy current signal of each through hole in the eddy current signal of the whole calibrating tube, and determining the centering of the probe.
Description
technical field [0001] The technology belongs to the field of verification methods, and in particular relates to a method for verifying the neutrality of an inner-penetrating eddy current detection probe. Background technique [0002] The steam generator is used to cool the high-temperature and high-pressure medium of the primary circuit of the nuclear power plant. It is a vulnerable part of the entire primary circuit. According to the requirements of relevant inspection specifications, non-destructive testing of the evaporator heat transfer tube must be carried out regularly. At present, the mature and reliable detection scheme is to conduct eddy current detection on the heat transfer tube of the evaporator, and the relevant detection equipment and detection methods are very demanding in the in-service detection of nuclear power equipment. [0003] The entire eddy current detection system includes detection hardware and related software. The hardware includes eddy current i...
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IPC IPC(8): G01N27/90
CPCG01N27/90
Inventor 冯美名崔洪岩廖述圣谢航陈姝邵文斌
Owner RES INST OF NUCLEAR POWER OPERATION