CN103760233A - shielding device for through eddy current sensor - Google Patents
shielding device for through eddy current sensor Download PDFInfo
- Publication number
- CN103760233A CN103760233A CN201410039422.XA CN201410039422A CN103760233A CN 103760233 A CN103760233 A CN 103760233A CN 201410039422 A CN201410039422 A CN 201410039422A CN 103760233 A CN103760233 A CN 103760233A
- Authority
- CN
- China
- Prior art keywords
- eddy current
- current sensor
- pipe box
- shielding pipe
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a shielding device for a through eddy current sensor. An ingenious shielding pipe sleeve with a plurality of axially strip-shaped holes formed in the pipe wall can shield interference of an external magnetic field and an electrostatic field, reduce depletion of the shielding pipe sleeve to a detecting coil induction magnetic field greatly, and increase detection precision and signal-to-noise ratio of the sensor.
Description
Affiliated technical field
The present invention relates to a kind of Non-Destructive Testing sensor device, particularly relate to a kind of shield assembly of through mode eddy current sensor.
Background technology
Through mode eddy current sensor is the conventional detecting sensor in electromagnetic eddy non-destructive detecting device, and through mode eddy current sensor is divided into externally wearing type and interior crossing type, is used for the online and off-line through mode testing of metal tube, rod, wire rod.In conventional through mode EDDY CURRENT process; often can be subject to the interference of external electromagnetic field; under the impact of outside interfere with electromagnetic field; in the time of tested workpiece, defect signal that through mode eddy current sensor receives, can receive undesired signal; when serious; undesired signal can override flaw indication, has a strong impact on the detection sensitivity of EDDY CURRENT, causes erroneous judgement, undetected.
Summary of the invention
The object of the invention is to overcome the deficiency of prior art, a kind of shield assembly of through mode eddy current sensor is provided, design the shielding pipe box that has multiple axial bar holes on unique tube wall, there is the double effects of the interference of shielding external electromagnetic field and the loss of reduction induced field.
The technical solution adopted for the present invention to solve the technical problems is: a kind of shield assembly of through mode eddy current sensor, comprise shielding pipe box, and it is characterized in that: described shielding pipe box material is metallic conductor; On the tube wall of described shielding pipe box, there are multiple axial bar holes; When described through mode eddy current sensor is externally wearing type, described shielded-plate tube cover embeds and is fixed in coil winding frame center through hole; When described through mode eddy current sensor is interior crossing type, described shielding pipe box is enclosed within the outer peripheral face of coil winding skeleton; Described shielding pipe box is connected with the ground wire of eddy detecting instrument.Shielding pipe box can play the interference of shielding external magnetic field and electrostatic field, conventionally, screen layer can weaken the induced field of magnetic test coil, affect its excitation density and detection sensitivity, shielding pipe box of the present invention, at magnetic test coil position, adopt unique multiple axial bar hole, greatly reduced the loss of shielding pipe box to magnetic test coil induced field, effectively play again the effect of electromagnetic screen simultaneously.
In actual testing process, because this shielding pipe box has masked the interference of external electromagnetic field, effectively reduced again induced field loss simultaneously, the flaw indication on the tested surface of the work that through mode eddy current sensor gathers and nearly surface is clear clean, and the signal to noise ratio (S/N ratio) of flaw indication and undesired signal is obviously better than the conventional through mode eddy current sensor in working site.
The invention has the beneficial effects as follows, a kind of shield assembly of through mode eddy current sensor, design the shielding pipe box that has multiple axial bar holes on unique tube wall, when can play the interference of shielding external magnetic field and electrostatic field, greatly reduce the loss of shielding pipe box to magnetic test coil induced field, effectively improved accuracy of detection and the signal to noise ratio (S/N ratio) of through mode EDDY CURRENT.
Below in conjunction with embodiment, the present invention is described in further detail, but the shield assembly of a kind of through mode eddy current sensor of the present invention is not limited to embodiment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the shield assembly schematic three dimensional views of the embodiment of the present invention.
Fig. 2 is the schematic three dimensional views of the externally wearing type eddy current sensor that shield assembly is installed of the embodiment of the present invention.
Fig. 3 is the schematic three dimensional views of the interior crossing type eddy current sensor that shield assembly is installed of the embodiment of the present invention.
In figure, 1. shielding pipe box, 11. bar holes, 2. coil winding skeleton, 3. magnetic test coil.
Embodiment
Embodiment as shown in Figure 1, Figure 2, Figure 3 shows, the shield assembly of a kind of through mode eddy current sensor of the present invention, comprises shielding pipe box 1, it is characterized in that: described shielding pipe box 1 material is metallic conductor, for example, can adopt copper to make; On the tube wall of described shielding pipe box 1, there are multiple axial bar holes 11; When described through mode eddy current sensor is externally wearing type, described shielding pipe box 1 embeds and is fixed in coil winding skeleton 2 central through holes; When described through mode eddy current sensor is interior crossing type, described shielding pipe box 1 is enclosed within the outer peripheral face of coil winding skeleton 2; Described shielding pipe box 1 is connected with the ground wire of eddy detecting instrument.Shielding pipe box 1 can play the interference of shielding external magnetic field and electrostatic field, conventionally, screen layer can weaken the induced field of magnetic test coil 3, affect its excitation density and detection sensitivity, shielding pipe box of the present invention, at magnetic test coil 3 positions, adopt unique multiple axial bar hole 11, greatly reduced the loss of shielding pipe box 1 to magnetic test coil 3 induced fields, effectively play again the effect of electromagnetic screen simultaneously.
Above-described embodiment is only used for further illustrating the shield assembly of a kind of through mode eddy current sensor of the present invention; but invention is not limited to embodiment; any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all fall in the protection domain of technical solution of the present invention.
Claims (1)
1. a shield assembly for through mode eddy current sensor, comprises shielding pipe box, it is characterized in that: described shielding pipe box material is metallic conductor; On the tube wall of described shielding pipe box, there are multiple axial bar holes; When described through mode eddy current sensor is externally wearing type, described shielded-plate tube cover embeds and is fixed in coil winding frame center through hole; When described through mode eddy current sensor is interior crossing type, described shielding pipe box is enclosed within the outer peripheral face of coil winding skeleton; Described shielding pipe box is connected with the ground wire of eddy detecting instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039422.XA CN103760233A (en) | 2014-01-27 | 2014-01-27 | shielding device for through eddy current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039422.XA CN103760233A (en) | 2014-01-27 | 2014-01-27 | shielding device for through eddy current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103760233A true CN103760233A (en) | 2014-04-30 |
Family
ID=50527506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410039422.XA Pending CN103760233A (en) | 2014-01-27 | 2014-01-27 | shielding device for through eddy current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103760233A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576719A (en) * | 2017-08-25 | 2018-01-12 | 爱德森（厦门）电子有限公司 | A kind of method for improving the online fluid metal worn particle electromagnetic monitoring degree of accuracy |
| CN111287733A (en) * | 2019-10-11 | 2020-06-16 | 中国石油大学(华东) | Method for detecting sucker rod of externally-penetrated rotating magnetic field well mouth |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108400A (en) * | 1985-12-13 | 1987-08-12 | 弗劳蒂克股份公司 | Eddy-current instrument |
| US6900640B2 (en) * | 2001-08-03 | 2005-05-31 | Baker Hughes Incorporated | Method and apparatus for a multi-component induction instrument measuring system for geosteering and formation resistivity data interpretation in horizontal, vertical and deviated wells |
| US7084728B2 (en) * | 2003-12-15 | 2006-08-01 | Nokia Corporation | Electrically decoupled integrated transformer having at least one grounded electric shield |
| CN1886671A (en) * | 2003-11-25 | 2006-12-27 | 皇家飞利浦电子股份有限公司 | Actively shielded gradient coil system comprising additional eddy current shield system |
| CN101750009A (en) * | 2009-12-31 | 2010-06-23 | 南京磁谷科技有限公司 | Magnetic-shielding eddy current sensor probe and method for reducing eddy current effect |
-
2014
- 2014-01-27 CN CN201410039422.XA patent/CN103760233A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108400A (en) * | 1985-12-13 | 1987-08-12 | 弗劳蒂克股份公司 | Eddy-current instrument |
| US6900640B2 (en) * | 2001-08-03 | 2005-05-31 | Baker Hughes Incorporated | Method and apparatus for a multi-component induction instrument measuring system for geosteering and formation resistivity data interpretation in horizontal, vertical and deviated wells |
| CN1886671A (en) * | 2003-11-25 | 2006-12-27 | 皇家飞利浦电子股份有限公司 | Actively shielded gradient coil system comprising additional eddy current shield system |
| US7084728B2 (en) * | 2003-12-15 | 2006-08-01 | Nokia Corporation | Electrically decoupled integrated transformer having at least one grounded electric shield |
| CN101750009A (en) * | 2009-12-31 | 2010-06-23 | 南京磁谷科技有限公司 | Magnetic-shielding eddy current sensor probe and method for reducing eddy current effect |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576719A (en) * | 2017-08-25 | 2018-01-12 | 爱德森（厦门）电子有限公司 | A kind of method for improving the online fluid metal worn particle electromagnetic monitoring degree of accuracy |
| CN111287733A (en) * | 2019-10-11 | 2020-06-16 | 中国石油大学(华东) | Method for detecting sucker rod of externally-penetrated rotating magnetic field well mouth |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107064291B (en) | Magnetic gathering pulse eddy current coil detection sensor | |
| CN102759567B (en) | The EDDY CURRENT identification of steel pipe inside and outside wall defect and evaluation method under DC magnetization | |
| CN102818754B (en) | Method and device of improving online monitoring accuracy of engine oil metal abrasive particles | |
| Yan et al. | Online nondestructive testing for fine steel wire rope in electromagnetic interference environment | |
| CN106290553A (en) | A kind of electromagnetic transducer system of novel detection defect in rope | |
| CN106290558B (en) | A kind of inner and outer walls of pipeline defect detecting device and detection method | |
| CN105467001A (en) | Integral MFL (Magnetic Flux Leakage) and eddy current array sensor for detecting copper-coated/aluminum-coated steel shaft type structure | |
| CN104833720B (en) | The method of single coil electromagnetism Resonance detector metallic conduit damage | |
| CN112782274A (en) | Magnetic-gathering eddy current sensor | |
| CN106442711A (en) | Eddy current reflection and transmittance based nondestructive testing method | |
| Ge et al. | Bobbin pulsed eddy current array probe for detection and classification of defects in nonferromagnetic tubes | |
| CN108692193A (en) | A kind of Pulsed Eddy Current Testing System and method of small-caliber pipeline defect | |
| CN103760233A (en) | shielding device for through eddy current sensor | |
| CN101311714A (en) | High-sensitivity vortex flow dot type probe | |
| CN108037178B (en) | Low-frequency electromagnetic array sensor for detecting corrosion defects of metal pipeline | |
| CN213580777U (en) | Cross pulse eddy current testing probe | |
| CN103454339B (en) | A kind of autoexcitation shields full magnetic information induction sniffer | |
| CN113030241B (en) | Device and method for distinguishing magnetic flux leakage detection signals of inner wall and outer wall of steel pipe in use | |
| CN205879865U (en) | Nondestructive detection system based on vortex reflection and transmission | |
| CN207636538U (en) | A kind of Metal pipeline corrosion defects detection low frequency electromagnetic sensor array | |
| CN102087245A (en) | Amorphous alloy based electromagnetic detection sensor | |
| CN108120765A (en) | The rotating vortex detection device and method of a kind of no coupler | |
| CN204758533U (en) | Leak magnetic sensor probe | |
| CN106199041A (en) | Non-chip-shaped inductance type revolution speed measuring is popped one's head in | |
| CN104777216A (en) | Magnetic yoke type local micromagnetization detection device suitable for point type defects |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140430 |