CN106404899A - Eddy current detection uplift shake compensation method - Google Patents
Eddy current detection uplift shake compensation method Download PDFInfo
- Publication number
- CN106404899A CN106404899A CN201610746496.6A CN201610746496A CN106404899A CN 106404899 A CN106404899 A CN 106404899A CN 201610746496 A CN201610746496 A CN 201610746496A CN 106404899 A CN106404899 A CN 106404899A
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- China
- Prior art keywords
- eddy current
- signal
- lift
- test coil
- detection
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
Abstract
The invention discloses an eddy current detection uplift shake compensation method. An eddy current detector employs time-sharing switching of a main check excitation signal and an auxiliary excitation signal to excite an eddy current detection coil, the auxiliary excitation signal monitors the uplift or shake change of the eddy current detection coil, through a set effective detection uplift shake signal threshold, missing detection or false detection caused by eddy current detection coil uplift or shake change can be effectively solved, and further, the auxiliary excitation signal monitors the uplift change of the eddy current detection coil, so that defect signals can be corrected and compensated in real time.
Description
Art
The present invention relates to a kind of lossless detection method, more particularly to a kind of EDDY CURRENT lift-off sway compensating method.
Background technology
The eddy current inspection of equipment in use to containing coating or have oxide layer, roughness change etc. the not good situation of apparent condition,
EDDY CURRENT effect will be affected, cause missing inspection or flase drop.For example, in metal material weld defect EDDY CURRENT, due to weld seam table
Face is coarse, will appear from different degrees of lift-off or rock during test coil of eddy current scanning, when lift-off or rock exceed certain
During limit, will appear from missing inspection or erroneous judgement.To certain ferrimagnet, its paint layer from surface thickness change reaches 1-2mm, and flaw detection sensitivity
The standard wound requiring detection 0.5mm deep is deep.Prior art will produce Lou, erroneous judgement.Industry has using two EDDY CURRENT at present
Coil combination, a main inspection test coil of eddy current detection defect, another auxiliary test coil of eddy current detection overburden cover becomes
Change, the flaw indication of main inspection test coil of eddy current detection is compensated and corrected, but the detection due to two test coil of eddy current
Be not same point, when the overburden cover of two test points is variant, detection error will be produced, also have missing inspection, erroneous judgement
Probability.
Though multifrequency Eddy method has two or more driving frequencies, only multiple rectified signals are linearly synthesized,
In order to be mixed one or more interference effect of suppression, do not possess compensation function.
Content of the invention
It is an object of the invention to overcoming the deficiency of prior art, provide a kind of EDDY CURRENT lift-off sway compensating method,
Lift-off change using auxiliary excitation signal monitoring test coil of eddy current.
The technical solution adopted for the present invention to solve the technical problems is：A kind of EDDY CURRENT lift-off sway compensating method,
It is characterized in that：Eddy current testing instrument encourages same EDDY CURRENT line using main inspection pumping signal with auxiliary excitation signal simultaneously
Circle, wherein main inspection pumping signal excitation test coil of eddy current detection fault in material, auxiliary excitation signal encourages test coil of eddy current
Detect the lift-off of test coil of eddy current or rock, eddy current testing instrument sets effective detection lift-off and rocks signal threshold values, effective detection
Lift-off is rocked signal threshold values and is determined according to detection sensitivity；During test coil of eddy current scanning, when occur lift-off or shake emotionally
During condition, main inspection pumping signal encourages in the fault in material signal that test coil of eddy current detects and will rock interference signal containing lift-off,
When auxiliary excitation signal encourages the lift-off that test coil of eddy current detection obtains to rock the effective detection lift-off rolling that signal exceedes setting
During dynamic signal threshold values, eddy current testing instrument is reported to the police, and judges that now main inspection pumping signal encourages the material of test coil of eddy current detection to lack
Sunken invalidating signal.
Further, during test coil of eddy current scanning, detected with auxiliary excitation signal excitation test coil of eddy current
To lift-off rock the real-time correction-compensation of signal main inspection pumping signal encourage test coil of eddy current detection obtain fault in material letter
Number, eliminate lift-off therein and rock interference signal.
The invention has the beneficial effects as follows, a kind of EDDY CURRENT lift-off sway compensating method, eddy current testing instrument adopts main inspection to swash
Encourage signal and encourage same test coil of eddy current, auxiliary excitation signal monitoring EDDY CURRENT line with auxiliary excitation signal timesharing switching
The lift-off of circle or rock change, signal threshold values is rocked in the effective detection lift-off of setting, effectively solving test coil of eddy current lift-off or
Rock change and cause missing inspection or flase drop, further, by the lift-off change of auxiliary excitation signal monitoring test coil of eddy current, real
When correction-compensation flaw indication.
With reference to embodiments the present invention is described in further detail, but a kind of EDDY CURRENT lift-off of the present invention is rocked
Compensation method is not limited to embodiment.
Brief description
The present invention is further described for middle embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the weld seam EDDY CURRENT schematic diagram of first embodiment of the invention.
Fig. 2 is that schematic diagram is rocked in the lift-off of the auxiliary excitation signal monitoring test coil of eddy current of first embodiment of the invention.
Fig. 3 is the uneven cover layer metal material defect EDDY CURRENT schematic diagram of second embodiment of the invention.
Fig. 4 is the lift-off change correction-compensation of the auxiliary excitation signal monitoring test coil of eddy current of second embodiment of the invention
The schematic diagram of flaw indication.
In figure, 1. eddy current testing instrument, 2. test coil of eddy current, 3. weld seam, A. weld defect signal, letter is rocked in B. lift-off
Number, signal threshold values is rocked in T. effective detection lift-off, 4. carries cover layer metal material, 5. cover layer, C. cover layer thickness variation is produced
Raw lift-off signal, D. carries cover layer metal material flaw indication, the real band cover layer of the Lift-off interference signal that CD. eliminates
Metal material flaw indication.
Specific embodiment
First embodiment, as shown in Figure 1 and Figure 2, a kind of EDDY CURRENT lift-off sway compensating method, eddy current testing instrument 1 adopts
Main inspection pumping signal encourages same test coil of eddy current 2 with auxiliary excitation signal simultaneously, wherein main inspection pumping signal excitation whirlpool
Stream detection coil 2 detection weld seam 3 defect, auxiliary excitation signal encourages test coil of eddy current 2 to detect the lift-off of test coil of eddy current 2
Or rock, eddy current testing instrument 1 set effective detection lift-off rock signal threshold values T, effective detection lift-off rock signal threshold values T according to
Detection sensitivity determines；During test coil of eddy current 2 scanning weld seam 3, when lift-off occurring or rocking situation, main inspection excitation letter
Number excitation test coil of eddy current 2 detection weld seam 3 flaw indication A in will rock interference signal containing lift-off, when auxiliary excitation believe
Number excitation test coil of eddy current 2 lift-off that obtains of detection is rocked signal B ultrasonic and is crossed the effective detection lift-off of setting and rocks signal threshold values T
When, eddy current testing instrument 1 is reported to the police, and judges the weld defect signal A of now main inspection pumping signal excitation test coil of eddy current 2 detection no
Effect.
Second embodiment, as shown in Figure 3, Figure 4, during test coil of eddy current 2 scanning band cover layer metal material 4, with
Auxiliary excitation signal encourages the main inspection of lift-off signal C correction-compensation that cover layer 5 thickness change that test coil of eddy current 2 obtains produces
Pumping signal encourages the band cover layer metal material flaw indication D that test coil of eddy current 2 obtains, the lift-off interference letter being eliminated
Number real band cover layer metal material flaw indication CD.
Above-described embodiment is only used for further illustrating a kind of EDDY CURRENT lift-off sway compensating method of the present invention, but this
Bright be not limited to embodiment, any simple modification that every technical spirit according to the present invention is made to above example, etc.
With change and modification, each fall within the protection domain of technical solution of the present invention.
Claims (2)
1. a kind of EDDY CURRENT lift-off sway compensating method it is characterised in that：Eddy current testing instrument adopt main inspection pumping signal with auxiliary
Help pumping signal to encourage same test coil of eddy current, wherein main inspection pumping signal excitation test coil of eddy current detection material simultaneously
Defect, auxiliary excitation signal encourages test coil of eddy current to detect the lift-off of test coil of eddy current or rock, and eddy current testing instrument sets
Signal threshold values is rocked in effective detection lift-off, and effective detection lift-off is rocked signal threshold values and determined according to detection sensitivity；EDDY CURRENT
During coil scanning, when lift-off or rocking situation, main inspection pumping signal encourages the material of test coil of eddy current detection
Interference signal will be rocked containing lift-off, when auxiliary excitation signal encourages test coil of eddy current to detect the lift-off obtaining in flaw indication
When rocking signal and exceeding the effective detection lift-off of setting and rock signal threshold values, eddy current testing instrument is reported to the police, and judges now main inspection excitation
Signal encourages the fault in material invalidating signal of test coil of eddy current detection.
2. a kind of EDDY CURRENT lift-off sway compensating method according to claim 1 it is characterised in that：Further, whirlpool
During stream detection coil scanning, the lift-off that test coil of eddy current detection obtains is encouraged to rock signal with auxiliary excitation signal real-time
Correction-compensation main inspection pumping signal encourages the fault in material signal that test coil of eddy current detection obtains, and eliminates lift-off therein and rocks
Interference signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610746496.6A CN106404899A (en) | 2016-08-29 | 2016-08-29 | Eddy current detection uplift shake compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610746496.6A CN106404899A (en) | 2016-08-29 | 2016-08-29 | Eddy current detection uplift shake compensation method |
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| Publication Number | Publication Date |
|---|---|
| CN106404899A true CN106404899A (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610746496.6A Pending CN106404899A (en) | 2016-08-29 | 2016-08-29 | Eddy current detection uplift shake compensation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834610A (en) * | 2021-01-22 | 2021-05-25 | 爱德森（厦门）电子有限公司 | High-inductance flexible magnetic-adhesion type eddy current array sensor device and monitoring method thereof |
| CN113514539A (en) * | 2021-04-12 | 2021-10-19 | 爱德森（厦门）电子有限公司 | Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating |
| CN113640369A (en) * | 2021-07-19 | 2021-11-12 | 哈尔滨工程大学 | Alternating current electromagnetic field lift-off effect compensation method suitable for metal surface cracks |
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| US4727322A (en) * | 1984-12-19 | 1988-02-23 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." | Method and apparatus for measuring thickness of a test part by an eddy current sensor, without contact and with lift-off compensation |
| US6344741B1 (en) * | 2000-06-20 | 2002-02-05 | Her Majesty The Queen As Represented By The Minister Of National Defence In Right Of Canada | Pulsed eddy current method for detection of corrosion in multilayer structures using the lift-off point of intersection |
| CN101413923A (en) * | 2007-06-12 | 2009-04-22 | 通用电气检查技术有限公司 | Automatic lift-off compensation for pulsed eddy current inspection |
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| CN103399083A (en) * | 2013-08-27 | 2013-11-20 | 南昌航空大学 | Method for restraining lift-off effect of impulse eddy current testing |
| CN103454342A (en) * | 2013-09-13 | 2013-12-18 | 爱德森（厦门）电子有限公司 | Technique for overcoming temperature drift of absolute eddy current testing probe |
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2016
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| US4727322A (en) * | 1984-12-19 | 1988-02-23 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." | Method and apparatus for measuring thickness of a test part by an eddy current sensor, without contact and with lift-off compensation |
| US6344741B1 (en) * | 2000-06-20 | 2002-02-05 | Her Majesty The Queen As Represented By The Minister Of National Defence In Right Of Canada | Pulsed eddy current method for detection of corrosion in multilayer structures using the lift-off point of intersection |
| CN101413923A (en) * | 2007-06-12 | 2009-04-22 | 通用电气检查技术有限公司 | Automatic lift-off compensation for pulsed eddy current inspection |
| CN102841137A (en) * | 2012-09-30 | 2012-12-26 | 爱德森（厦门）电子有限公司 | Compensating method for detecting interference signal through rotating eddy current |
| CN103399083A (en) * | 2013-08-27 | 2013-11-20 | 南昌航空大学 | Method for restraining lift-off effect of impulse eddy current testing |
| CN103454342A (en) * | 2013-09-13 | 2013-12-18 | 爱德森（厦门）电子有限公司 | Technique for overcoming temperature drift of absolute eddy current testing probe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834610A (en) * | 2021-01-22 | 2021-05-25 | 爱德森（厦门）电子有限公司 | High-inductance flexible magnetic-adhesion type eddy current array sensor device and monitoring method thereof |
| CN112834610B (en) * | 2021-01-22 | 2023-09-08 | 爱德森（厦门）电子有限公司 | High-inductance flexible magnetic-patch type eddy current array sensor device and monitoring method thereof |
| CN113514539A (en) * | 2021-04-12 | 2021-10-19 | 爱德森（厦门）电子有限公司 | Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating |
| CN113640369A (en) * | 2021-07-19 | 2021-11-12 | 哈尔滨工程大学 | Alternating current electromagnetic field lift-off effect compensation method suitable for metal surface cracks |
| CN113640369B (en) * | 2021-07-19 | 2023-09-26 | 哈尔滨工程大学 | Alternating current electromagnetic field lift-off effect compensation method suitable for metal surface cracks |
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Application publication date: 20170215 |