CN108872366B - Self-adaptive orthogonal eddy current detection sensor - Google Patents
Self-adaptive orthogonal eddy current detection sensor Download PDFInfo
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- CN108872366B CN108872366B CN201810809008.0A CN201810809008A CN108872366B CN 108872366 B CN108872366 B CN 108872366B CN 201810809008 A CN201810809008 A CN 201810809008A CN 108872366 B CN108872366 B CN 108872366B
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- 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
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
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Abstract
The invention discloses a self-adaptive orthogonal eddy current detection sensor, which adopts a method of fixing a magnet at an orthogonal point of an orthogonal eddy current detection coil, and coats a protective shell made of non-conductive magnetic or weakly conductive magnetic material outside a coil framework, so that the orthogonal eddy current detection coil and the framework can freely slide in a certain range in the protective shell, and the optimal detection sensitive area of the orthogonal eddy current detection sensor is ensured to be always in the normal direction of a detected surface by utilizing the characteristic that the magnet and the detected ferromagnetic workpiece surface are mutually attracted, thereby ensuring the optimal detection sensitivity.
Description
Technical Field
The invention relates to a nondestructive testing device, in particular to a self-adaptive orthogonal eddy current testing sensor.
Background
The orthogonally wound eddy current detection sensor is insensitive to the lift-off effect, so that the sensor is widely applied to the detection of the crack defects of unsmooth materials on the surfaces, such as metal welding seams and the like. However, when the detection object is a curved surface, the effect is greatly impaired, and the reason for this is that the optimum detection sensitivity region of the sensor, i.e., the orthogonal intersection of the orthogonally wound eddy current detection coils, is not located in the normal direction of the detection surface, so that the detection sensitivity is greatly reduced, and the lift-off effect becomes sensitive.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a self-adaptive orthogonal eddy current detection sensor aiming at a large amount of ferromagnetic materials existing in the industrial field. The method of fixing the magnet at the orthogonal point of the orthogonal eddy current detection coil is adopted, and the characteristic that the magnet and the detection surface of the ferromagnetic workpiece to be detected are mutually attracted is utilized to ensure that the optimal detection sensitive area of the orthogonal eddy current detection sensor is always positioned in the normal direction of the detection surface, so that the optimal detection sensitivity is ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a self-adaptation quadrature eddy current testing sensor, includes spherical skeleton, magnet, quadrature winding eddy current detection coil, protective housing, its characterized in that: the orthogonal winding eddy current detection coil is wound and fixed on the spherical framework; the magnet is embedded and fixed in a spherical framework at the orthogonal point of the orthogonal winding eddy current detection coil; the protective housing is non-conductive magnetic conduction or weakly conductive magnetic conduction material, the protective housing bottom is the hemisphere shell type, and the combination of quadrature winding eddy current detection coil, spherical skeleton, magnet is placed in the protective housing bottom hemisphere shell, and the combination of quadrature winding eddy current detection coil, spherical skeleton, magnet can freely slide in the hemisphere shell.
When the self-adaptive orthogonal eddy current detection sensor is used for detecting a ferromagnetic workpiece, when a detected area with a detection surface being a cambered surface is scanned, due to the mutual attraction effect of the magnet and the detection surface of the detected ferromagnetic workpiece, the coil orthogonal point of the orthogonal eddy current detection sensor is always in the normal direction of the detection surface, so that the orthogonal eddy current detection sensor can always keep the optimal detection sensitivity.
The invention has the beneficial effects that the self-adaptive orthogonal eddy current detection sensor adopts a method of fixing a magnet at the orthogonal point of the orthogonal eddy current detection coil, and the coil framework is sleeved with the protective shell made of non-conductive magnetic or weak conductive magnetic material, so that the orthogonal eddy current detection coil and the framework can freely slide in a certain range in the protective shell, and the optimal detection sensitive area of the orthogonal eddy current detection sensor is ensured to be always in the normal direction of the detected surface by utilizing the characteristic that the magnet and the detected ferromagnetic workpiece surface are mutually attracted, thereby ensuring the optimal detection sensitivity.
The present invention will be described in further detail with reference to the following embodiments, but the adaptive orthogonal eddy current test sensor of the present invention is not limited to the embodiments.
Drawings
The invention will be further elucidated with reference to an embodiment in the drawing.
Fig. 1 is a schematic structural view of a conventional orthogonal eddy current inspection sensor.
FIG. 2 is a schematic diagram of a conventional orthogonal eddy current inspection sensor in inspecting a flat surface and a curved surface.
FIG. 3 is a schematic diagram of an adaptive orthogonal eddy current test sensor according to an embodiment of the invention.
FIG. 4 is a schematic diagram of an adaptive orthogonal eddy current inspection sensor according to an embodiment of the invention for detecting an arc surface.
In the figure, 1, a spherical framework, 2, a magnet, L1, L2, an orthogonal winding eddy current detection coil, 3, a protective shell, 4, a detected workpiece detection surface, A, an orthogonal point and F, a normal line.
Detailed Description
Fig. 1 is a schematic structural view of a conventional orthogonal eddy current test sensor, and fig. 2 is a schematic view of a conventional orthogonal eddy current test sensor when detecting an arc surface, and it can be seen that an optimal detection sensitive zone of the sensor when the conventional orthogonal eddy current test sensor detects an arc surface, that is, an orthogonal point a of orthogonal winding eddy current detection coils L1 and L2, cannot be maintained in a direction of a normal F of a detection surface 4, resulting in a great reduction in detection sensitivity.
The embodiment of the invention, as shown in fig. 3, is a self-adaptive orthogonal eddy current detection sensor, which comprises a spherical skeleton 1, a magnet 2, orthogonal winding eddy current detection coils L1, L2 and a protective shell 3, and is characterized in that: the orthogonal winding eddy current detection coils L1 and L2 are wound and fixed on the spherical framework 1; the magnet 2 is embedded and fixed in the spherical skeleton 1 at the orthogonal point A of the orthogonal winding eddy current detection coils L1 and L2; the protective housing 3 is non-conductive magnetic conduction or weakly conductive magnetic conduction material, the bottom of the protective housing 3 is a hemispherical shell type, the assembly of the orthogonal winding eddy current detection coils L1, L2, the spherical skeleton 1 and the magnet 2 is placed in the hemispherical shell at the bottom in the protective housing 3, and the assembly of the orthogonal winding eddy current detection coils L1, L2, the spherical skeleton 1 and the magnet 2 can freely slide in the hemispherical shell.
As shown in fig. 4, when the adaptive orthogonal eddy current sensor of the present invention is used to detect a ferromagnetic workpiece, when the detected area with the detection surface 4 being a cambered surface is scanned, the orthogonal point a of the coil of the orthogonal eddy current sensor is always in the direction of the normal F of the detection surface 4 due to the attraction between the magnet 2 and the detection surface 4 of the ferromagnetic workpiece, so that the orthogonal eddy current sensor can always maintain the optimal detection sensitivity.
The above embodiments are merely intended to further illustrate an adaptive orthogonal eddy current test sensor of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the scope of the technical solution of the present invention.
Claims (1)
1. The utility model provides a self-adaptation quadrature eddy current testing sensor, includes spherical skeleton, magnet, quadrature winding eddy current detection coil, protective housing, its characterized in that: the orthogonal winding eddy current detection coil is wound and fixed on the spherical framework; the magnet is embedded and fixed in a spherical framework at the orthogonal point of the orthogonal winding eddy current detection coil; the protective housing is non-conductive magnetic conduction or weakly conductive magnetic conduction material, the protective housing bottom is the hemisphere shell type, and the combination of quadrature winding eddy current detection coil, spherical skeleton, magnet is placed in the protective housing bottom hemisphere shell, and the combination of quadrature winding eddy current detection coil, spherical skeleton, magnet can freely slide in the hemisphere shell.
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| CN201810809008.0A CN108872366B (en) | 2018-07-23 | 2018-07-23 | Self-adaptive orthogonal eddy current detection sensor |
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| CN108872366B true CN108872366B (en) | 2021-12-21 |
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| 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 |
Citations (6)
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| JPH102883A (en) * | 1996-06-18 | 1998-01-06 | Mitsubishi Heavy Ind Ltd | Eddy current flaw detection apparatus |
| JP2004219188A (en) * | 2003-01-14 | 2004-08-05 | Itake Shoji Kk | Probe for eddy current examination |
| CN102879461A (en) * | 2012-09-30 | 2013-01-16 | 爱德森（厦门）电子有限公司 | Non-directional electromagnetic detecting sensor based on crosslinking differential detecting principle |
| JP2014025704A (en) * | 2012-07-24 | 2014-02-06 | Toshiba Corp | Eddy current flaw detection device |
| CN206489116U (en) * | 2017-01-18 | 2017-09-12 | 西安交通大学 | A kind of magnetic drives formula Array eddy-current probe for defect inspection |
| CN108120764A (en) * | 2017-12-21 | 2018-06-05 | 爱德森（厦门）电子有限公司 | A kind of orthogonal Eddy Current Testing Transducer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024534A (en) * | 2017-04-11 | 2017-08-08 | 北京工业大学 | The omni-directional vortex self-adapting scanning system of carbon fibre reinforced composite uniformity defect |
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- 2018-07-23 CN CN201810809008.0A patent/CN108872366B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH102883A (en) * | 1996-06-18 | 1998-01-06 | Mitsubishi Heavy Ind Ltd | Eddy current flaw detection apparatus |
| JP2004219188A (en) * | 2003-01-14 | 2004-08-05 | Itake Shoji Kk | Probe for eddy current examination |
| JP2014025704A (en) * | 2012-07-24 | 2014-02-06 | Toshiba Corp | Eddy current flaw detection device |
| CN102879461A (en) * | 2012-09-30 | 2013-01-16 | 爱德森（厦门）电子有限公司 | Non-directional electromagnetic detecting sensor based on crosslinking differential detecting principle |
| CN206489116U (en) * | 2017-01-18 | 2017-09-12 | 西安交通大学 | A kind of magnetic drives formula Array eddy-current probe for defect inspection |
| CN108120764A (en) * | 2017-12-21 | 2018-06-05 | 爱德森（厦门）电子有限公司 | A kind of orthogonal Eddy Current Testing Transducer |
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