CN103868987A - Eddy detection probe for detecting surface multiple cracks of conductive structure and detection method thereof - Google Patents
Eddy detection probe for detecting surface multiple cracks of conductive structure and detection method thereof Download PDFInfo
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- CN103868987A CN103868987A CN201210538929.0A CN201210538929A CN103868987A CN 103868987 A CN103868987 A CN 103868987A CN 201210538929 A CN201210538929 A CN 201210538929A CN 103868987 A CN103868987 A CN 103868987A
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Abstract
The invention discloses an eddy current probe adopting an array structure. The eddy current probe is used to detect surface multiple cracks of conductive structure and analogue defects. The eddy current probe is composed of an excitation coil array and a detection coil array; the excitation coil array and the detection coil array both comprises horizontal coils, which are parallel to the surface of a detected structure, and vertical coils, which are perpendicular to the surface of the detected structure; the horizontal detection coils are arranged in the horizontal excitation coils, the horizontal detection coils and the horizontal excitation coils are parallel to the surface of the detected structure; and the vertical detection coils are perpendicular to the vertical excitation coils. When the eddy current generated by the horizontal excitation coils is interfered by a crack, the change can be detected by the vertical detection coils, thus the crack that is parallel to the vertical detection coils can be detected; when the magnetic flow generated by the vertical excitation coils is interfered by a crack, the change can be detected by the horizontal detection coils, and thus the crack that is parallel to the vertical excitation coils can be detected. The probe can scan multiple crack defects in a region on the surface of a detected conductive structure at a time, and moreover the information of the crack number, crack direction, and shape information such as length, width, and depth can be obtained according to the defect signal characteristics sent by the detection coils.
Description
Technical field
The present invention relates to a kind of non-destructive control probe device and defect inspection method, particularly relate to a kind of metal construction and material surface multiple cracks defect vortex flow detection probe and detection method thereof.
Background technology
EDDY CURRENT is a kind of Dynamic Non-Destruction Measurement very widely that uses, principle of work is followed electromagnetic induction principle, when the drive coil that is connected with exchange current is during near conductive material, to in conductor material, produce alternating magnetic field, this is called Primary field, and this alternating magnetic field can go out vortex flow at conductive material surface induction simultaneously.Vortex flow in conductor also can produce magnetic field, is called secondary magnetic field.If there is defects i.e.cracks in conductor structure surface on vortex flow path, will cause the variation of vortex flow, thereby the secondary magnetic field that vortex flow produces is also changed, cause magnetic test coil institute sensing electric signals to change.Just can judge accordingly the existence of conductor material surface imperfection.
Vortex flow detects has the excellent properties such as speed is fast, effects on surface defect is quick on the draw.In the detection of many key equipments such as steam generator pipe, nuclear power station heat exchanging pipe, play an important role.For assessment apparatus structural safety, requirement obtains the information such as quantity, position and the shape of conductive structure surfaces defects i.e.cracks.Tradition unicoil probe adopts the reciprocal scanning of single-point, is only suitable for detecting single crack defect, and wastes time and energy.In actual conditions, surface of the work crackle is often many concurrent situations, and multiple cracks is larger to the destructiveness of metal construction than simple check line.If can not accurately judge the number of multiple cracks, trend and shape separately, easily cause undetectedly and mishandling, may cause serious security incident.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of eddy current probe device and detection method of conductive structure surfaces multiple cracks is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of vortex flow detection probe of metal structure surface multiple cracks defect, and this probe drive coil and magnetic test coil are all made up of coil array; Drive coil and magnetic test coil array all comprise the planar coil parallel with detected body structure surface and with the perpendicular coil composition of detected surface.
Planar excitation wires circle is rectangular, and quantity is at least two, and each coil dimension is identical, is arranged in parallel each other.
Drive coil perpendicular to detected material surface is rectangular, and quantity is at least three, and each coil measure-alike is arranged in parallel each other, is two planar excitation wires circles between them.
Magnetic test coil perpendicular to detected material surface is rectangular, this magnetic test coil is perpendicular to planar excitation wires circle surface, the quantity of planar excitation wires circle top vertical direction magnetic test coil is at least 4, and each magnetic test coil is measure-alike, is equidistantly arranged in parallel each other.
The plane magnetic test coil quantity parallel with detected material surface is at least 8, and each plane magnetic test coil is rectangular, and measure-alike, between the vertical direction magnetic test coil and planar excitation wires circle frame equidistantly arranged.
Adopt the method for this probe detection conductive structure surfaces multiple cracks as follows.Drive coil array produces electromagnetic field and the vortex flow of different directions in larger region of detected conductive structure surfaces, be subject to crackle disturbing influence and will produce the variation of path and intensity, the different electrical signals of the many magnetic test coils institute sensing by parallel with detected conductive material surface in probe and vertical distribution, can detect multiple crackles that diverse location distributes simultaneously, not only can determine the quantity of multiple crackles, and can according to the corresponding magnetic test coil kind of institute's picked up signal judge its below crackle direction, and distribute and amplitude can be analyzed the shape of crackle according to institute picked up signal.
The crackle paralleling with vertical direction magnetic test coil for conductive material surface, can realize the detection of vortex flow by vertical direction magnetic test coil; The vortex flow that planar excitation wires circle excites is in the time running into the crackle paralleling with vertical direction magnetic test coil, vortex flow is disturbed and will shunts along direction of check, this vortex flow of being shunted can be detected with the immediate vertical direction magnetic test coil of this crackle, is embodied in this coil and obtains maximum signal intensity amplitude.Known accordingly have a crackle paralleling with this vertical direction magnetic test coil near this coil.
For the perpendicular crackle of conductive material surface and vertical direction magnetic test coil, can detect by the following method.Drive coil perpendicular to detected conductive surface inspires the magnetic flux vertical with this coil surface, this magnetic flux will be along crackle generation path change in the time running into the crackle perpendicular with vertical direction magnetic test coil, there is the flux component of vertical detected material surface to produce, this flux component can be detected by the plane magnetic test coil of close this crackle, be embodied in this coil and obtain maximum signal amplitude.Accordingly known near this magnetic test coil, have vertical with this to the perpendicular crackle of magnetic test coil.
Brief description of the drawings
Fig. 1 is the eddy current probe structural drawing that the present invention detects conductive structure surfaces multiple cracks.
Fig. 2 is the eddy current probe top view that the present invention detects conductive structure surfaces multiple cracks.
Fig. 3 is conductive structure surfaces multiple cracks model top view.
Fig. 4 is that the present invention pops one's head in and utilizes electromagnetic field to change to detect the crackle schematic diagram parallel with vertical direction drive coil.
Fig. 5 is that the present invention pops one's head in and utilizes vortex flow to change to detect the crackle schematic diagram parallel with vertical direction magnetic test coil.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
In the Non-Destructive Testing of key equipment, adopt traditional eddy current probe and method to be difficult to detect multiple cracks defect, but multiple cracks is larger to the destructiveness of metal construction than simple check line.Therefore need to improve the ability of number, direction and SHAPE DETECTION to multiple cracks, avoid occurring the undetected generation that causes security incident.
Referring to Fig. 1, Figure 2 shows that conductive structure surfaces multiple cracks current vortex detection probe structural drawing of the present invention.This eddy current probe includes drive coil array and magnetic test coil array; Drive coil array is made up of with coil 2a, 2b, the 2c vertical with detected face planar coil 1a, the 1b parallel with detected structure 5 surfaces.Magnetic test coil array is made up of the planar coil array 4a parallel with detected structure 5 surfaces, 4b, 4c, 4d, 4e, 4f, 4g, 4h and coil 3a, 3b, 3c, 3d, 3e, the 3f vertical with detected structure 5 surfaces.
Planar excitation wires circle 1a, 1b are rectangular, and 1a and 1b are measure-alike, are arranged in parallel each other.
Vertical direction drive coil 2a, 2b, 2c are rectangular, measure-alike, perpendicular to detected structure 5 surfaces, are arranged in parallel each other.Two planar excitation wires circle 1a and 1b are between three vertical direction drive coil 2a, 2b, 2c.
Vertical direction magnetic test coil 3a, 3b, 3c, 3d, 3e, 3f are rectangular, and perpendicular to detected structure 5 surfaces, and perpendicular with planar excitation wires circle 1a, 1b place plane, each vertical direction magnetic test coil is measure-alike and be equidistantly arranged in parallel each other.
Plane magnetic test coil 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h are rectangular, be parallel to detected structure 5 surfaces, each planar rectangular magnetic test coil measure-alike, is equidistantly arranging between vertical direction magnetic test coil 3a, 3b, 3c, 3d, 3e, 3f and planar excitation wires circle 1a, 1b frame.
It shown in Fig. 3, is conductive structure surfaces multiple cracks model.Mutual spacing is called multiple cracks from two or more crackles very, in Fig. 3, on conductive structure 5 surfaces, multiple cracks 6,7,8 is shown.Wherein crackle 6 parallel with 7 and in horizontal direction arrange.Crackle 8 is arranged in vertical direction.
Figure 4 shows that by vortex flow probe scanning of the present invention, utilize the vertical direction drive coil of probe to detect the surface crack defect parallel with vertical drive coil with plane magnetic test coil.Drive coil 2b, 2c and with a detected structure 5 surperficial parallel magnetic test coil 4e vertical with detected structure 5 surfaces in probe shown in Fig. 4 A.In order to detect surface crack 8, carry out as follows scanning program.Probe is along the direction scanning vertical with drive coil winding 2b, 2c plane, the magnetic flux 9 that the inner exchange current of drive coil 2b, 2c produces has part by detected conductive material 5, owing to having crackle 8 on detected material 5 surfaces, and direction and the direction of scanning of crackle 8 are perpendicular, the path of magnetic flux 9 will be subject to the interference of crackle 8, becomes unordered at the magnetic flux of measured material 5 surfaces.The magnetic flux of some vertical direction can pass through magnetic test coil 4e, and in magnetic test coil 4e, produces an electromotive force, and this electromotive force is presented as flaw indication 10.If in probe scanning process, as shown in Fig. 4 B, 4D, the edge of magnetic test coil winding 4e approaches respectively crackle 8, and magnetic test coil will obtain respectively the flaw indication 10 of an opposite polarity.If as shown in Figure 4 C, magnetic test coil 4e center is through crackle 8, and the magnetic flux 9 that passes in and out magnetic test coil offsets, and just can in magnetic test coil 4e, not produce electromotive force, and now flaw indication 10 is zero.
Figure 5 shows that on detected material 5 surfaces and have a crackle paralleling with direction of scanning 7.It is relevant with the direction of excitation winding 1a, the inner exchange current of 1b that planar excitation wires circle 1a, 1b winding thereunder produce the direction of vortex flow 11 in measured material 5.Therefore, one side of vortex flow flow circuits is vertical with crackle 7, the mobile interference that is subject to crackle 7 of vortex flow 11.Therefore, the secondary magnetic flux that vortex flow 11 produces is by disturbance, along with probe moves along scanning direction, as shown in Fig. 5 A, 5C, in the time that magnetic test coil 3e approaches and leaves crackle 7, the magnetic flux that flows through magnetic test coil 3e both sides is asymmetric, produce electromotive force difference on magnetic test coil 3e both sides, in magnetic test coil 3e, produce a total electromotive force, and be presented as a flaw indication 10, and two kinds of situation acquisition electromotive force polarity are contrary.If as shown in Figure 5 B, magnetic test coil 3e is positioned at the center of crackle 7, and the mobile magnetic test coil 3e that is symmetrical in of vortex flow like this, is exactly balance by the magnetic flux of magnetic test coil 3e, just can not produce the electromotive force that represents flaw indication.
Fig. 5 D is depicted as vertical direction array detection coil test material 5 crackles that parallel with direction of scanning 7 in surface that utilize the present invention to pop one's head in, in Fig. 5 D, there are three vertical direction magnetic test coil 3d, 3e, 3f, magnetic test coil 3e and crackle 7 are the most approaching, the flaw indication amplitude maximum obtaining in by certain orientation scanning process. Magnetic test coil 3f and 3e are in the same side of crackle 7, but far away apart from crackle 7, the signal amplitude obtaining in scanning process is less than the flaw indication that magnetic test coil 3e obtains.Magnetic test coil 3d is positioned at the opposite side of crackle 7, and the flaw indication polarity obtaining is contrary with 3e, 3f, and amplitude is between 3e and 3f.Therefore,, according to different magnetic test coil institute picked up signal amplitude, can judge the residing position of crackle.
Claims (8)
1. one kind is detected the vortex flow probe of metal structure surface multiple cracks defect, it is characterized in that: include drive coil array and magnetic test coil array;
Drive coil array is made up of the planar coil array (1a) parallel with detected structure (5) surface, (1b) and coil (2a), (2b), (2c) vertical with detected structure (5) surface;
Magnetic test coil array is made up of the planar coil array (4a) parallel with detected structure (5) surface, (4b), (4c), (4d), (4e), (4f), (4g), (4h) and coil array (3a), (3b), (3c), (3d), (3e), (3f) vertical with detected structure (5) surface.
2. the probe of detection conductive structure surfaces multiple cracks according to claim 1, it is characterized in that: planar excitation wires circle (1a), (1b) are rectangular, and the length of rectangle is greater than 3 with wide ratio, measure-alike with (1b) of planar rectangular drive coil (1a), quantity is at least two, (1a) Yu (1b) is arranged in parallel each other.
3. the probe of detection conductive structure surfaces multiple cracks according to claim 1, it is characterized in that: vertical direction drive coil (2a), (2b), (2c) are rectangular, quantity is at least three, each coil measure-alike, all perpendicular to detected structure (5) surface, and be arranged in parallel each other;
Two planar excitation wires circles (1a) and (1b) be positioned between three vertical direction drive coils (2a), (2b), (2c).
4. the probe of detection conductive structure surfaces multiple cracks according to claim 1, it is characterized in that: vertical direction magnetic test coil (3a), (3b), (3c), (3d), (3e), (3f) are rectangular, perpendicular with planar excitation wires circle (1a), (1b) place plane, each vertical direction magnetic test coil measure-alike, each planar excitation wires circle (1a) or (1b) quantity of top vertical direction magnetic test coil are at least 4, between each vertical direction magnetic test coil, are equidistantly arranged in parallel.
5. the probe of detection conductive structure surfaces multiple cracks according to claim 1, it is characterized in that: plane magnetic test coil (4a), (4b), (4c), (4d), (4e), (4f), (4g), (4h) rectangular, be parallel to detected structure (5) surface, each planar rectangular magnetic test coil measure-alike, be positioned at equidistant arrangement vertical direction magnetic test coil (3a), (3b), (3c), (3d), (3e), (3f) with planar excitation wires circle (1a), (1b) between frame.
6. the vortex flow detection method of a metal structure surface multiple cracks defect, it is characterized in that: drive coil array (2a), (2b), (2c) with (1a), (1b) on detected structure (5) surface, larger region produces the electromagnetic field (9) and vortex flow (11) of different directions respectively, on the path of electromagnetic field (9) and vortex flow (11), the existence of detected structure (5) surface crack (6), (7) or (8) will cause the disturbance of electromagnetic field (9) and vortex flow (11);
Variation that can sensing electromagnetic field (9) by plane magnetic test coil (4a), (4b), (4c), (4d), (4e), (4f), (4g), (4h);
Variation that can sensing vortex flow (11) by vertical direction magnetic test coil (3a), (3b), (3c), (3d), (3e), (3f);
Utilize this probe sensing coil array can detect the existence of conductive structure (5) the multiple crackles of surperficial diverse location adjacent distributions (6), (7) or (8) simultaneously.Can determine the quantity of crackle, and judge the different directions of crackle according to the difference of magnetic test coil that obtains Signal of Cracks (10), and can judge the shape of crackle according to the distribution of obtained flaw indication (10) and amplitude.
7. the method for detection conductive structure surfaces multiple cracks according to claim 6, it is characterized in that: in detected conductive structure (5) surface and vertical direction magnetic test coil (3a), (3b), (3c), (3d), (3e), (3f) parallel crackle (6), (7), can be subject to crackle (6) or (7) shock wave to cause the detection realization of changes of magnetic field to the vortex flow (11) of planar excitation wires circle (1a), (1b) generation by vertical direction magnetic test coil;
The vortex flow (11) that planar excitation wires circle (1a), (1b) excite will be shunted along crackle in the time running into the crackle paralleling with vertical direction magnetic test coil (3a), (3b), (3c), (3d), (3e), (3f), this vortex flow of being shunted (11) can be detected with the nearest vertical direction magnetic test coil of this crackle, and the amplitude that is embodied in this coil signal (10) changes maximum.Known accordingly have a crackle paralleling with this vertical direction magnetic test coil near this coil.
8. the method for detection conductive structure surfaces multiple cracks according to claim 6, is characterized in that: vertical direction drive coil (2a), (2b), (2c) magnetic flux (9) vertical with this coil surface exciting running into and vertical direction magnetic test coil (3a), (3b), (3c), (3d), (3e), (3f) be subject to when vertical crackle (8) after the disturbance of this crackle, flow direction being changed, will have the flux component generation on vertical detected structure (5) surface, this flux component is at plane magnetic test coil (4a), (4b), (4c), (4d), (4e), (4f), (4g), (4h) in, in the nearest coil of some and this crackle, produce maximum signal (10) amplitude, known accordingly have and vertical direction magnetic test coil (3a) near this magnetic test coil, (3b), (3c), (3d), (3e), (3f) perpendicular crackle (8).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104407047A (en) * | 2014-11-21 | 2015-03-11 | 昆明理工大学 | Eddy current testing probe based on TMR magnetic field sensor array and detecting method of eddy current testing probe |
| CN104535644A (en) * | 2014-12-24 | 2015-04-22 | 钢研纳克检测技术有限公司 | Eddy current probe for detecting multi-direction defects on thin steel plate surface |
| CN106949920A (en) * | 2017-03-15 | 2017-07-14 | 重庆大学 | A kind of magnetoelastic sensor detection means |
| CN109975387A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of electromagnetic detection probe based on nuclear power station sheet plane weld seam |
| CN110426450A (en) * | 2019-08-14 | 2019-11-08 | 上海海事大学 | Metal multiple spot crack electromagnetical fault detection system |
| CN112611800A (en) * | 2020-11-16 | 2021-04-06 | 江苏安泰安全技术有限公司 | Rapid scanning method and system for detecting microcracks on surface of pressure equipment |
| CN113777156A (en) * | 2021-09-17 | 2021-12-10 | 南昌航空大学 | double-D focusing coil array far-field eddy current probe and detection method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407047A (en) * | 2014-11-21 | 2015-03-11 | 昆明理工大学 | Eddy current testing probe based on TMR magnetic field sensor array and detecting method of eddy current testing probe |
| CN104535644A (en) * | 2014-12-24 | 2015-04-22 | 钢研纳克检测技术有限公司 | Eddy current probe for detecting multi-direction defects on thin steel plate surface |
| CN106949920A (en) * | 2017-03-15 | 2017-07-14 | 重庆大学 | A kind of magnetoelastic sensor detection means |
| CN106949920B (en) * | 2017-03-15 | 2019-05-24 | 重庆大学 | A kind of magnetoelastic sensor detection device |
| CN109975387A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of electromagnetic detection probe based on nuclear power station sheet plane weld seam |
| CN110426450A (en) * | 2019-08-14 | 2019-11-08 | 上海海事大学 | Metal multiple spot crack electromagnetical fault detection system |
| CN110426450B (en) * | 2019-08-14 | 2023-12-22 | 上海海事大学 | Metal multipoint crack electromagnetic flaw detection system |
| CN112611800A (en) * | 2020-11-16 | 2021-04-06 | 江苏安泰安全技术有限公司 | Rapid scanning method and system for detecting microcracks on surface of pressure equipment |
| CN113777156A (en) * | 2021-09-17 | 2021-12-10 | 南昌航空大学 | double-D focusing coil array far-field eddy current probe and detection method thereof |
| CN113777156B (en) * | 2021-09-17 | 2023-09-08 | 南昌航空大学 | double-D focusing coil array far-field eddy current probe and detection method thereof |
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Application publication date: 20140618 |