CN106501356A - A kind of interior crossing type eddy current probe centering method of calibration - Google Patents

A kind of interior crossing type eddy current probe centering method of calibration Download PDF

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Publication number
CN106501356A
CN106501356A CN201611248371.7A CN201611248371A CN106501356A CN 106501356 A CN106501356 A CN 106501356A CN 201611248371 A CN201611248371 A CN 201611248371A CN 106501356 A CN106501356 A CN 106501356A
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eddy current
hole
current signal
probe centering
crossing type
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CN106501356B (en
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冯美名
崔洪岩
廖述圣
谢航
陈姝
邵文斌
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Research Institute of Nuclear Power Operation
China Nuclear Power Operation Technology Corp Ltd
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Research Institute of Nuclear Power Operation
China Nuclear Power Operation Technology Corp Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

A kind of interior crossing type eddy current probe centering method of calibration, comprises the following steps：Step 1：Define Alignment measuring points n；Step 2：In calibrating tube, measure dot number n according to determined by step 1 processes through hole, and through hole is along the circumferential uniform number of degrees distribution of calibrating tube；Step 3：Axially distribution is not less than probe detection sensitivity to through hole；Step 4：Sample frequency, picking rate, port number are set；Step 5：The eddy current signal of whole calibrating tube is gathered, and this eddy current signal includes differential path signal；Step 6：Demarcation process is carried out to the eddy current signal that step 5 is gathered, including phase normalization, amplitude normalization；Step 7：The differential path signal in the eddy current signal of step 5 collection is selected, the eddy current signal of each through hole in the eddy current signal of whole calibrating tube is measured, determine probe centering.

Description

A kind of interior crossing type eddy current probe centering method of calibration
Technical field
The technology belongs to method of calibration field, and in particular to a kind of interior crossing type eddy current probe centering method of calibration.
Background technology
Steam generator is used for the high-temperature high-pressure medium of the primary Ioops for cooling down nuclear power station, is the frangible portion in whole primary Ioops Part, according to the requirement of coherence check specification, it is necessary to periodically carry out Non-Destructive Testing to heat-transfer pipe of evaporator.The inspection of mature and reliable at present Survey scheme is to carry out EDDY CURRENT to heat-transfer pipe of evaporator, the in-service inspection of associated assay devices and detection method in nuclear power generating equipment Require in survey very high.
Whole eddy detection system includes detecting that hardware and related software, hardware include that eddy-current instrument, cable, vortex are visited Head, control chamber, localizer, push away and pull out device, communication system etc.；Software section includes management software, acquisition software, analysis software, biography Defeated software, cooperation management software, localizer control software, push away and pull out device control software etc..Implementing heat exchange tube of evaporator detection is, It is required that whole system each subassembly normally runs the enforcement that just can guarantee that detection process.In whole detecting system, it is right to be vortexed Neutrality directly affects the stability of signal.In design probe, increasing centralising device at coil two ends makes coil as far as possible Heat transfer inside pipe wall is brought into close contact, so as to ensure good centering.Whole probe coil circumferential zones faradic current is required simultaneously Field homogeneity.Whether current probe designs, the equal relative maturity of processing technology, centering well do not have the detection method of correlation and way Footpath.
Content of the invention
It is an object of the invention to：A kind of interior crossing type eddy current probe centering method of calibration is provided, by this detection side The fields such as method probe making, signal analysis, provide reference to improving probe production method, technique etc.
Technical scheme is as follows：A kind of interior crossing type eddy current probe centering method of calibration, including following step Suddenly：
Step 1：Define Alignment measuring points n；
Step 2：In calibrating tube, measure dot number n according to determined by step 1 processes through hole, and through hole is circumferential along calibrating tube Evenness number is distributed；
Step 3：Axially distribution is not less than probe detection sensitivity to through hole；
Step 4：Sample frequency, picking rate, port number are set；
Step 5：The eddy current signal of whole calibrating tube is gathered, and this eddy current signal includes differential path signal；
Step 6：Demarcation process is carried out to the eddy current signal that step 5 is gathered, including phase normalization, amplitude normalization；
Step 7：Select the differential path signal in the eddy current signal of step 5 collection, the eddy current signal to whole calibrating tube In the eddy current signal of each through hole measure, include n voltage magnitude after n through hole measurement, respectively V1, V2 ..., with And Vn；Meansigma methodss M of n amplitude, and the deviation of each through hole signal and meansigma methodss M is calculated, absolute value in n deviation is taken Maximum deviation Dvmax；The ratio-dependent probe centering of this maximum and meansigma methodss M is calculated, formula is as follows：
As a result Di is the index for characterizing probe centering.
In the step 1, it is desirable to which n more than or equal to 4 and is less than or equal to 10.
In the step 2, when n is equal to 4, four through hole circumference layouts are 0 degree, 90 degree, 180 degree and 270 degree.
Other points situations, the circumferentially-spaced number of degrees of each measurement point are according to 360 degree divided by points.
In the step 3, through hole axial direction layout pitch distance is more than or equal to 10mm.
In the step 4, according to tube material, wall thickness is demarcated, sample frequency, picking rate, port number are set.
In the step 7, metering system selects very big peak-to-peak value VPP.
In the step 7, Di values are lower to represent that reaction probe centering is better.
The remarkable result of the present invention is：The centering that effective measuring probe is capable of by the method；Making probe When, production method and technique are improved by the method；According to a large amount of testing results, the whether qualified standard of probe centering is formed.
Description of the drawings
Fig. 1 is that four through hole calibrating tubes of interior crossing type eddy current probe centering method of calibration of the present invention are illustrated Figure；
Fig. 2 is four through hole calibrating tube top views of interior crossing type eddy current probe centering method of calibration of the present invention
Specific embodiment
A kind of interior crossing type eddy current probe centering method of calibration, comprises the following steps：
Step 1：Define Alignment measuring points n, it is desirable to which points more than or equal to 4 and are less than or equal to 10；
Step 2：In calibrating tube, measure dot number n according to determined by step 1 processes through hole, and through hole is circumferential along calibrating tube Evenness number is distributed, and when such as n is equal to 4, four through holes circumference layouts are 0 degree, 90 degree, 180 degree and 270 degree, other situations of counting, The circumferentially-spaced number of degrees of each measurement point are according to 360 degree divided by points, reference Fig. 1；
Step 3：Axially distribution is not less than probe detection sensitivity to through hole, or spacing distance is more than or equal to 10mm.
Step 4：According to tube material, wall thickness is demarcated, sample frequency, picking rate, port number are set；
Step 5：The eddy current signal of whole calibrating tube is gathered, and this eddy current signal includes differential path signal；
Step 6：Demarcation process is carried out to the eddy current signal that step 5 is gathered, including phase normalization, amplitude normalization；
Step 7：Select the differential path signal in the eddy current signal of step 5 collection, the eddy current signal to whole calibrating tube In the eddy current signal of each through hole measure, metering system selects very big peak-to-peak value VPP, includes that n is individual after n through hole measurement Voltage magnitude, respectively V1, V2 ..., and Vn；Calculate meansigma methodss M of n amplitude, and each through hole signal and meansigma methodss M Deviation, take deviation Dvmax of maximum absolute value in n deviation；Calculate the ratio-dependent of this maximum and meansigma methodss M Probe centering, formula are as follows：
As a result Di is the index for characterizing probe centering, and more low reaction probe centering is better；Whether probe centering is qualified, Can determine according to this result.

Claims (8)

1. a kind of interior crossing type eddy current probe centering method of calibration, it is characterised in that：Comprise the following steps：
Step 1：Define Alignment measuring points n；
Step 2：In calibrating tube, measure dot number n according to determined by step 1 processes through hole, and through hole is along the calibrating tube circumference uniformity Number distribution；
Step 3：Axially distribution is not less than probe detection sensitivity to through hole；
Step 4：Sample frequency, picking rate, port number are set；
Step 5：The eddy current signal of whole calibrating tube is gathered, and this eddy current signal includes differential path signal；
Step 6：Demarcation process is carried out to the eddy current signal that step 5 is gathered, including phase normalization, amplitude normalization；
Step 7：The differential path signal in the eddy current signal of step 5 collection is selected, in the eddy current signal to whole calibrating tube The eddy current signal of each through hole is measured, and includes n voltage magnitude, respectively V1, V2 ..., and Vn after n through hole measurement； Meansigma methodss M of n amplitude, and the deviation of each through hole signal and meansigma methodss M is calculated, maximum absolute value in n deviation is taken Deviation Dvmax；The ratio-dependent probe centering of this maximum and meansigma methodss M is calculated, formula is as follows：
D i = 100 × | D v max | M
As a result Di is the index for characterizing probe centering.
2. a kind of interior crossing type eddy current probe centering method of calibration according to claim 1, it is characterised in that：Described In step 1, it is desirable to which n more than or equal to 4 and is less than or equal to 10.
3. a kind of interior crossing type eddy current probe centering method of calibration according to claim 1, it is characterised in that：Described In step 2, when n is equal to 4, four through hole circumference layouts are 0 degree, 90 degree, 180 degree and 270 degree.
4. a kind of interior crossing type eddy current probe centering method of calibration according to claim 3, it is characterised in that：Other Points situation, the circumferentially-spaced number of degrees of each measurement point are according to 360 degree divided by points.
5. a kind of interior crossing type eddy current probe centering method of calibration according to claim 1, it is characterised in that：Described In step 3, through hole axial direction layout pitch distance is more than or equal to 10mm.
6. a kind of interior crossing type eddy current probe centering method of calibration according to claim 1, it is characterised in that：Described In step 4, according to tube material, wall thickness is demarcated, sample frequency, picking rate, port number are set.
7. a kind of interior crossing type eddy current probe centering method of calibration according to claim 1, it is characterised in that：Described In step 7, metering system selects very big peak-to-peak value VPP.
8. a kind of interior crossing type eddy current probe centering method of calibration according to claim 1, it is characterised in that：Described In step 7, Di values are lower to represent that reaction probe centering is better.
CN201611248371.7A 2016-12-29 2016-12-29 A kind of interior crossing type eddy current probe is to neutral method of calibration Active CN106501356B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108732239A (en) * 2018-06-28 2018-11-02 江苏核电有限公司 A kind of steam generator heat-transfer pipe vortex inspection probe automatic calibration device and its installation method
CN109975396A (en) * 2017-12-27 2019-07-05 核动力运行研究所 A kind of heat-transfer pipe vortex detection differential path signal symmetry measurement method
CN111351839A (en) * 2018-12-20 2020-06-30 核动力运行研究所 Automatic calibration and calibration method for eddy current signals of heat transfer pipe
CN111351835A (en) * 2018-12-20 2020-06-30 核动力运行研究所 Heat exchange tube approach distance eddy current measuring method
CN111351836A (en) * 2018-12-20 2020-06-30 核动力运行研究所 Method for optimizing pattern imaging of eddy current detection signal of array probe

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109975396A (en) * 2017-12-27 2019-07-05 核动力运行研究所 A kind of heat-transfer pipe vortex detection differential path signal symmetry measurement method
CN108732239A (en) * 2018-06-28 2018-11-02 江苏核电有限公司 A kind of steam generator heat-transfer pipe vortex inspection probe automatic calibration device and its installation method
CN108732239B (en) * 2018-06-28 2023-09-08 江苏核电有限公司 Automatic calibration device for vortex inspection probe of heat transfer tube of steam generator and installation method of automatic calibration device
CN111351839A (en) * 2018-12-20 2020-06-30 核动力运行研究所 Automatic calibration and calibration method for eddy current signals of heat transfer pipe
CN111351835A (en) * 2018-12-20 2020-06-30 核动力运行研究所 Heat exchange tube approach distance eddy current measuring method
CN111351836A (en) * 2018-12-20 2020-06-30 核动力运行研究所 Method for optimizing pattern imaging of eddy current detection signal of array probe
CN111351839B (en) * 2018-12-20 2023-08-22 核动力运行研究所 Automatic calibration and verification method for vortex signal of heat transfer tube
CN111351836B (en) * 2018-12-20 2023-09-12 核动力运行研究所 Imaging optimization method for eddy current detection signal pattern of array probe

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