CN102879461B - Non-directional electromagnetic detecting sensor based on crosslinking differential detecting principle - Google Patents
Non-directional electromagnetic detecting sensor based on crosslinking differential detecting principle Download PDFInfo
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- CN102879461B CN102879461B CN201210373577.8A CN201210373577A CN102879461B CN 102879461 B CN102879461 B CN 102879461B CN 201210373577 A CN201210373577 A CN 201210373577A CN 102879461 B CN102879461 B CN 102879461B
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Abstract
The invention discloses a non-directional electromagnetic detecting sensor based on a crosslinking differential detecting principle. A crosslinking combined probe and a differential hybrid algorithm principle are used, the sensor comprises two sets of cross differential detecting coils, which are wound on a coil winding frame concentrically with angle difference of 45 DEG, and accordingly electromagnetic eddy current induction signal difference is guaranteed to be output for cracks in optional direction by the sensor, the problem of crack blind area in the direction of 45 DEG of the differential electromagnetic detecting sensor composed of the two detecting coils by crossing is eliminated, and non-missed detection is achieved.
Description
Technical field
The present invention relates to a kind of Non-Destructive Testing sensor, particularly relate to a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle.
Background technology
Conventional eddy current probe, owing to there being the impact of Lift-off effect, for the workpiece that metal material surface roughness is large, testing requirement is higher, is difficult to implement effective detection.By two orthogonal differential electromagnetic detecting sensors that form of magnetic test coil cross, there is the characteristic of the interference that suppresses Lift-off effect, the metal material that is specially adapted to surface irregularity detects, in the time that transversal crack is arrived in sensor scanning, the vortex field that transverse coil produces is subject to crackle and has the greatest impact, and the vortex field that longitudinal coil produces is subject to crackle impact minimum, so two coils have maximum poor output, can detect reliably this defect.In like manner, when sensor scanning is when the longitudinal crack, it is minimum that the vortex field that transverse coil produces is subject to crackle impact, and the vortex field that longitudinal coil produces is subject to crackle and has the greatest impact, so two coils have maximum poor output, can detect reliably this defect.Quadrature sensor is the most responsive to these two kinds of defects detection.From the above, coil vortex field changes the angle difference of depending between direction of check and each coil.In the time that direction of check and coil become parallel, coil vortex field changes maximum; In the time that direction of check becomes vertical with coil, coil vortex field changes minimum.In the time that direction of check is oblique crackle, two of quadrature sensors coil-induced to vortex field all there is different variations, when direction of check gradually changes from 0 degree to 45 degree with orthogonal two coil angles, two induction coil output differences diminish gradually, so detection sensitivity reduces gradually.When crackle and coil are in angle of 45 degrees time, two coil-induced consistent eddy current signals outputs.So concerning quadrature sensor, the direction of check of 45 degree is blind area, cannot detect.
Summary of the invention
The object of the invention is to, the problem that diminishes and detect blind area in order to overcome the sensitivity of differential electromagnetic detecting sensor of two orthogonal compositions of magnetic test coil cross, develop a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle, adopt crosslinked coupling probe and differential hybrid algorithm, the problem of having eliminated 45 degree direction crackle blind areas, realizes without undetected detection.
The technical solution adopted for the present invention to solve the technical problems is: a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle, comprises four magnetic test coils, coil winding skeleton, sensor output terminal interface, shell, top cover; Described four concentric cross windings of magnetic test coil are fixed on coil winding skeleton, one group of cruciform differential detection coil groups of two orthogonal compositions of magnetic test coil, another group cruciform differential detection coil groups of other two orthogonal compositions of magnetic test coil, differs miter angle between two groups of cruciform differential detection coil groups.When same group of cruciform differential detection coil groups of crackle is with crackle in angle of 45 degrees time, the output of no signal difference, and now another group cruciform differential detection coil groups is parallel with crackle, vertical, two magnetic test coils of this group produce the output of peak signal difference, thereby have ensured that sensor is to all vortex induction signal difference output of the crackle of any direction.Described four magnetic test coils have overcrossing point and the undercrossing point, and the undercrossing point that is positioned at sensor base is sensor scanning central point.Described four magnetic test coils are connected to respectively sensor output terminal interface, two groups of signals that cruciform differential detection coil groups gathers, transfer to dual-channel electromagnetic detecting instrument by sensor output terminal interface, again this double-channel signal is carried out to vector superposed computing, the crackle that ensures different directions all can obtain peak signal difference, then this superposed signal difference is shown to output by same impedance plane, ensure that different directions crackle obtains peak signal and shows output; Described coil winding skeleton is fixing in the enclosure; Described sensor output terminal interface is inlayed and is fixed on top cover upper surface.The material of described four magnetic test coils is red copper enameled wire, and the diameter of red copper enameled wire, the coil winding number of turn, coil winding cross-sectional area, coil winding width require to determine according to relevant electromagnetic detection frequency, precision and sensitivity.Described coil winding skeleton adopts the nonmetal solid materials such as nylon or duroplasts, and nonmetal solid material is easily processed, electromagnetic field that simultaneously can Interference Detection coil stimulating.The shape of coil winding skeleton can be cylindrical, the ellipsoid bodily form or spherical according to testing requirement; Outside surface is processed with four concentric winding groove that differ miter angle, and the length equidimension of winding groove is determined according to the winding cross-sectional area of magnetic test coil, winding width.Described shell can adopt the nonmetal solid materials such as nylon, duroplasts, rubber, and the shape of shell is determined according to coil winding frame configuration, can is drum-shaped, semielliptical is barrel-shaped or hemisphere is barrel-shaped.Drum-shaped shell bottom surface is scanning face, is applicable to planar shaped workpiece sensing, and the barrel-shaped or barrel-shaped outer casing bottom end points of hemisphere of semielliptical is scanning point, is applicable to the workpiece sensing of surface imperfection.Described top cover adopts the nonmetal solid materials such as aluminium alloy, stainless steel and other metal materials or nylon, duroplasts, rubber, is convenient to fixation of sensor output terminal interface.
The invention has the beneficial effects as follows, a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle, adopt crosslinked coupling probe and differential hybrid algorithm principle, sensor is differed miter angle, is wound around and is distributed on coil winding skeleton with one heart by two groups of cruciform differential detection coil groups, ensure that sensor has the output of electromagnetic eddy induced signal difference to the crackle of any direction, the problem of having eliminated 45 degree direction crackle blind areas of the differential electromagnetic detecting sensor of two orthogonal compositions of magnetic test coil cross, realizes without undetected detection.
Below in conjunction with embodiment, the invention will be further described.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the sensor outward appearance schematic three dimensional views of first embodiment of the invention.
Fig. 2 is the sensor internal structure three-dimensional schematic diagram of first embodiment of the invention.
Fig. 3 is sensor magnetic test coil and the coil winding skeleton schematic three dimensional views of first embodiment of the invention.
Fig. 4 is sensor magnetic test coil and the coil winding skeleton schematic top plan view of first embodiment of the invention.
Fig. 5 is that the cell winding of first embodiment of the invention is wound around skeleton schematic three dimensional views.
Fig. 6 is that the cell winding of first embodiment of the invention is wound around skeleton schematic top plan view.
Fig. 7 is the sensor outward appearance schematic three dimensional views of second embodiment of the invention.
Fig. 8 is the sensor internal structure three-dimensional schematic diagram of second embodiment of the invention.
Fig. 9 is sensor magnetic test coil and the coil winding skeleton schematic side view of second embodiment of the invention.
Figure 10 is sensor magnetic test coil and the coil winding skeleton schematic top plan view of second embodiment of the invention.
Figure 11 is that the cell winding of second embodiment of the invention is wound around skeleton schematic side view.
Figure 12 is that the cell winding of second embodiment of the invention is wound around skeleton schematic top plan view.
Figure 13 is the sensor outward appearance schematic three dimensional views of third embodiment of the invention.
Figure 14 is the sensor internal structure three-dimensional schematic diagram of third embodiment of the invention.
Figure 15 is sensor magnetic test coil and the coil winding skeleton schematic side view of third embodiment of the invention.
Figure 16 is sensor magnetic test coil and the coil winding skeleton schematic top plan view of third embodiment of the invention.
Figure 17 is that the cell winding of third embodiment of the invention is wound around skeleton schematic side view.
Figure 18 is that the cell winding of third embodiment of the invention is wound around skeleton schematic top plan view.
In figure, 1. magnetic test coil, 2. coil winding skeleton (cylindrical), 3. sensor output terminal interface, 4. shell (flexible shape), 5. top cover, 6. one group of cruciform differential detection coil groups, 7. another group cruciform differential detection coil groups, 8. winding groove, 9. overcrossing point, 10. the undercrossing point, 11. coil winding skeletons (the ellipsoid bodily form), 12. shells (semielliptical is barrel-shaped), 13. coil winding skeletons (spherical), 14. shells (hemisphere is barrel-shaped).
Embodiment
In the first embodiment as shown in Fig. 1,2,3,4,5,6, based on a non-oriented magnetic detecting sensor for crosslinked formula differential detection principle, comprise four magnetic test coils (1), coil winding skeleton (2), sensor output terminal interface (3), shell (4), top cover (5); Described four magnetic test coils (1) with one heart cross winding are fixed on coil winding skeleton (2), two magnetic test coils (1), one group of cruciform differential detection coil groups of orthogonal composition (6), another group cruciform differential detection coil groups (7) of other two orthogonal compositions of magnetic test coil, between two groups of cruciform differential detection coil groups (6,7), differ miter angle.Described four magnetic test coils (1) have overcrossing point (9) and the undercrossing point (10), and the undercrossing point (10) that is positioned at sensor base is sensor scanning central point; Described four magnetic test coils (1) are connected to respectively sensor output terminal interface (3); Described coil winding skeleton (2) is fixing in the enclosure; Described sensor output terminal interface (3) is inlayed and is fixed on top cover (5) upper surface.The material of described four magnetic test coils (1) is red copper enameled wire, and the diameter of red copper enameled wire, the coil winding number of turn, coil winding cross-sectional area, coil winding width require to determine according to relevant electromagnetic detection frequency, precision and sensitivity.Described coil winding skeleton (2) adopts the nonmetal solid materials such as nylon or duroplasts, coil winding skeleton (2) be shaped as cylindrical; Outside surface is processed with four concentric winding groove (8) that differ miter angle, and the length equidimension of winding groove is determined according to the winding cross-sectional area of magnetic test coil (1), winding width.Described shell (4) is drum-shaped, and shell (4) can adopt the nonmetal solid materials such as nylon, duroplasts, rubber, and top cover (5) adopts the nonmetal solid materials such as aluminium alloy, stainless steel and other metal materials or nylon, duroplasts, rubber.In scanning process, testing staff's hand-held sensor, the bottom surface of sensor is attached to tested surface of the work rectilinear direction uniform scanning, and in scanning path, the arbitrarily oriented crack defect of sensor process can have peak signal to show output.
In the second embodiment as shown in Fig. 7,8,9,10,11,12, different from the first embodiment of the present invention:
Described coil winding skeleton be shaped as the ellipsoid bodily form (11), described shell is semielliptical barrel-shaped (12).
In the 3rd embodiment as shown in Figure 13,14,15,16,17,18, different from the first embodiment of the present invention:
Described coil winding skeleton be shaped as spherical (13), described shell is hemisphere barrel-shaped (14).
Above-described embodiment is only used for further illustrating a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle of the present invention, but the present invention is not limited to embodiment, should be appreciated that in not departing from the scope of the present invention, can make multiple combination and change to above-described embodiment.All any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. the non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle, is characterized in that: comprise four magnetic test coils, coil winding skeleton, sensor output terminal interface, shell, top cover; Described four concentric cross windings of magnetic test coil are fixed on coil winding skeleton, one group of cruciform differential detection coil groups of two orthogonal compositions of magnetic test coil, another group cruciform differential detection coil groups of other two orthogonal compositions of magnetic test coil, differs miter angle between two groups of cruciform differential detection coil groups; Described four magnetic test coils have overcrossing point and the undercrossing point, and the undercrossing point that is positioned at sensor base is sensor scanning central point; Described four magnetic test coils are connected to respectively sensor output terminal interface; Described coil winding skeleton is fixing in the enclosure; Described sensor output terminal interface is inlayed and is fixed on top cover upper surface.
2. a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle according to claim 1, it is characterized in that: the material of described four magnetic test coils is red copper enameled wire, the diameter of red copper enameled wire, the coil winding number of turn, coil winding cross-sectional area, coil winding width require to determine according to relevant electromagnetic detection frequency, precision and sensitivity.
3. a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle according to claim 1, it is characterized in that: described coil winding skeleton adopts nylon or duroplasts nonmetal solid material, and the shape of coil winding skeleton adopts cylindrical, the ellipsoid bodily form or spherical according to testing requirement; Outside surface is processed with four concentric winding groove that differ miter angle, and the length size of winding groove is determined according to the winding cross-sectional area of magnetic test coil, winding width.
4. a kind of non-oriented magnetic detecting sensor based on crosslinked formula differential detection principle according to claim 1, it is characterized in that: described shell adopts nylon, duroplasts, rubber nonmetal solid material, the shape of shell according to coil winding frame configuration determine, adopt drum-shaped, semielliptical is barrel-shaped or hemisphere is barrel-shaped; Described top cover adopts aluminium alloy, stainless steel metal material or nylon, duroplasts, rubber nonmetal solid material.
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| CN103196996B (en) * | 2013-04-17 | 2016-06-08 | 浙江大学 | A kind of eddy current testing device for carrying out metal defect detection and eddy current probe thereof |
| CN107490620A (en) * | 2017-07-27 | 2017-12-19 | 中国大唐集团科学技术研究院有限公司华中分公司 | Ni-based pored component inwall detection method and device |
| CN108872366B (en) * | 2018-07-23 | 2021-12-21 | 爱德森（厦门）电子有限公司 | Self-adaptive orthogonal eddy current detection sensor |
| CN110763755A (en) * | 2019-10-29 | 2020-02-07 | 广东省特种设备检测研究院珠海检测院 | Evaluation method capable of rapidly evaluating crack defect direction of metal material |
| CN111766295B (en) * | 2020-07-31 | 2022-12-13 | 广东汕头超声电子股份有限公司 | Eddy current detection probe for detecting steel rail welding seam and detection method thereof |
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