CN106352787A - Array pulsed eddy current measurement method and device for ovality of steel pipe - Google Patents
Array pulsed eddy current measurement method and device for ovality of steel pipe Download PDFInfo
- Publication number
- CN106352787A CN106352787A CN201610885110.XA CN201610885110A CN106352787A CN 106352787 A CN106352787 A CN 106352787A CN 201610885110 A CN201610885110 A CN 201610885110A CN 106352787 A CN106352787 A CN 106352787A
- Authority
- CN
- China
- Prior art keywords
- eddy current
- steel pipe
- current measuring
- array
- ovality
- 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
Classifications
-
- 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
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
- G01B7/282—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures for measuring roundness
Abstract
The invention relates to an array pulsed eddy current measurement method and a device for the ovality of a steel pipe. The method comprises the following steps: the to be detected steel pipe is centered through a centering device, and penetrates through an array pulsed eddy current measurement probe; an exciting coil center line of the pulsed eddy current measurement probe and a receiving magnetic sensitive element magnetic sensitive direction in a coil directly face the surface of the steel pipe along a normal direction so as to sense the magnetic field change of the surface of the steel pipe; the steel pipe moves relative to the pulsed eddy current measurement probe, and the detection signal amplitude corresponds to the distance between a measured probe surface and the surface of the steel pipe; a plurality of signals measured by the array pulsed eddy current measurement probe are processed so as to obtain the ovality of the steel pipe. A measurement system provided by the invention is simple in structure, and applicable to the high-speed, automatic and non-contact measurement of the ovality of the steel pipe; a pulse sequence exciting coil is adopted, so that the crosstalk problem between the probes is completely avoided; a time division multiplexing method is adopted for processing the array measurement signals, so that the data processing is simple, and the efficiency is high.
Description
Technical field
The present invention relates to field of non destructive testing is and in particular to a kind of steel pipe ovality array pulsed eddy current measuring method and dress
Put.
Background technology
Steel pipe such as oil pipe etc. widely uses in industries such as oil, chemical industry, electric power, and steel pipe is in its life period interior diameter meeting
Increase, then wall thickness is thinning, after ovality changes, easily cause leakage, in turn result in security incident.Therefore steel pipe is ellipse
Circularity constantly measures in life period planted agent and monitors.
Content of the invention
The technical problem to be solved is to provide a kind of steel pipe ovality array pulsed eddy current measuring method and dress
Put, the method can achieve non-cpntact measurement, adapt to high speed measurement requirement, to steel tube surface require low.
The technical scheme is that a kind of steel pipe ovality array pulsed eddy current measurement side
Method, comprises the following steps:
S1: tested steel pipe carries out centering through centralising device, and run through array pulsed eddy current measuring probe；
S2: the reception magneto sensor magnetic susceptibility direction edge in the excitation coil centrage of impulse eddy current measuring probe and coil
Just to steel tube surface, excitation coil and reception magneto sensor form impulse eddy current measuring probe, the magnetic of sensing steel tube surface to normal direction
Field change；
S3: steel pipe moves with respect to impulse eddy current measuring probe, detection signal amplitude respective pulses eddy current measurement probe
Measuring surface and steel tube surface are apart from size；
The treated ellipse that can get steel pipe of the signal measuring of the impulse eddy current measuring probe of s4: multiple arrays
Degree.
Further, described centralising device can be mechanical centring device or photoelectric centering device.
Further, the place plane of the impulse eddy current measuring probe of the plurality of array is perpendicular to steel pipe axial line and along steel
Pipe circumference 360 degree be evenly arranged, the excitation coil centrage of impulse eddy current measuring probe and reception magneto sensor magnetic susceptibility direction
Parallel to steel pipe radially.
Further, using impulse eddy current measuring probe described in the square wave excitation of adjustable pulse-width.
Further, the receiving portion of described impulse eddy current measuring probe adopts magnet-sensitive element.
Further, described reception magneto sensor adopts tmr sensor.
Further, described impulse eddy current measuring probe makes pulse current order pass through each excitation line using time-sharing exciting
Circle, receives the change in magneto sensor inductive impulse magnetic field successively.
Further, the detection signal of described impulse eddy current measuring probe is processed using time-multiplexed method.
The invention also discloses a kind of dress of the steel pipe ovality array pulsed eddy current measurement being applied to above-mentioned measuring method
Put, including measurement assembly and mechanical component, measurement assembly includes pulse excitation source, multiple impulse eddy current measurements of array arrangement are visited
Head, amplifier, wave filter, a/d capture card and computer, mechanical component includes centralising device and moving device, described centering dress
Put and steel pipe is carried out centering, described moving device drives described steel pipe to pass through the array center of described impulse eddy current measuring probe；
Described impulse eddy current measuring probe includes excitation coil and receives magneto sensor；Described pulse excitation source timesharing is to described pulse whirlpool
Flow measurement is popped one's head in into row energization, and described reception magneto sensor measures described steel tube surface changes of magnetic field, according to described impulse eddy current
With described steel tube surface apart from size corresponding output relevant voltage, multiple described impulse eddy currents measure the measuring surface of measuring probe
The measurement signal of probe is acquired by time-multiplexed method, after collection signal amplified device amplification, filter filtering, then
Snap into computer by a/d collection to be processed, after calculating, obtain steel pipe ovality information.
Based on technique scheme, the invention has the beneficial effects as follows:
1) simple in measurement system structure of the present invention is it is adaptable to the high speed of steel pipe ovality, automatization, non-cpntact measurement,
High precision, highly reliable, do not affected by water and oil rub resistance.
2) adopt pulse sequence excitation coil in the present invention, the cross-interference issue between avoiding popping one's head in completely.
3) present invention adopts time-multiplexed method to process array measurement signal, and data processing is simple, efficiency high.
Brief description
Fig. 1 is impulse eddy current measuring probe instrumentation plan；
Fig. 2 is array pulsed eddy current measuring probe circumferentially schematic diagram；
Fig. 3 is pulse square wave excitation waveform figure；
Fig. 4 is measurement apparatus schematic diagram.
Specific embodiment
Below in conjunction with accompanying drawing, the principle of the present invention and feature are described, example is served only for explaining the present invention, and
Non- for limiting the scope of the present invention.
The invention discloses a kind of steel pipe ovality array pulsed eddy current measuring method, comprise the following steps:
S1: tested steel pipe 9 carries out centering through centralising device 7, and runs through array pulsed eddy current measuring probe 2；Described right
Middle device 7 can be mechanical centring device or photoelectric centering device.
S2: reception magneto sensor 22 magnetic susceptibility in excitation coil 21 centrage of impulse eddy current measuring probe 2 and coil
Along normal direction just to steel pipe 9 surface, excitation coil 21 and reception magneto sensor 22 form impulse eddy current measuring probe 2, sensing in direction
The changes of magnetic field on steel pipe 9 surface, as shown in Figure 1；As shown in Fig. 2 the place of the impulse eddy current measuring probe 2 of the plurality of array
360 degree perpendicular to steel pipe 9 axial line and along steel pipe 9 circumference of plane is evenly arranged, the excitation coil 21 of impulse eddy current measuring probe 2
Centrage and reception magneto sensor 22 magnetic susceptibility are oriented parallel to steel pipe 9 radially.The acceptance division of described impulse eddy current measuring probe 2
Divide and adopt magnet-sensitive element.Described reception magneto sensor 22 adopts tmr sensor.
S3: steel pipe 9 moves with respect to impulse eddy current measuring probe 2, detection signal amplitude respective pulses eddy current measurement probe 2
Measuring surface and steel pipe 9 surface apart from size.
The treated ellipse that can get steel pipe 9 of the signal measuring of the impulse eddy current measuring probe 2 of s4: multiple arrays
Degree.
Using impulse eddy current measuring probe 2 described in the square wave excitation of adjustable pulse-width, pulse square wave excitation waveform such as Fig. 3
Shown.Described impulse eddy current measuring probe 2 makes pulse current order pass through each excitation coil using time-sharing exciting.Described pulse
The detection signal of eddy current measurement probe 2 is processed using time-multiplexed method.
The invention also discloses a kind of dress of the steel pipe ovality array pulsed eddy current measurement being applied to above-mentioned measuring method
Put, as shown in figure 4, including measurement assembly and mechanical component, measurement assembly includes pulse excitation source 1, multiple arteries and veins of array arrangement
Rush eddy current measurement probe 2, amplifier 3, wave filter 4, a/d capture card 5 and computer 6, mechanical component includes centralising device 7 and row
Enter device 8；Described impulse eddy current measuring probe 2 includes excitation coil 21 and receives magneto sensor 22.
During measurement, steel pipe 9 is carried out centering by described centralising device 7, and described moving device 8 drives described steel pipe 9 to pass through institute
State the array center of impulse eddy current measuring probe 2, described pulse excitation source 1 timesharing is carried out to described impulse eddy current measuring probe 2
Excitation, described reception magneto sensor 22 measures described steel pipe 9 Surface field change, according to described impulse eddy current measuring probe 2
Measuring surface is with described steel pipe 9 surface apart from size corresponding output relevant voltage, the survey of multiple described impulse eddy current measuring probes 2
Amount signal is acquired by time-multiplexed method, and the collection amplified device of signal 3 amplifies, after wave filter 4 filtering, then by a/
D capture card 5 is processed to computer 6, obtains steel pipe 9 ovality information after calculating.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of steel pipe ovality array pulsed eddy current measuring method is it is characterised in that comprise the following steps:
S1: tested steel pipe carries out centering through centralising device, and run through array pulsed eddy current measuring probe；
S2: the reception magneto sensor magnetic susceptibility direction in the excitation coil centrage of impulse eddy current measuring probe and coil is along normal direction
Just to steel tube surface, excitation coil and reception magneto sensor form impulse eddy current measuring probe, and the magnetic field of sensing steel tube surface becomes
Change；
S3: steel pipe moves with respect to impulse eddy current measuring probe, the measurement of detection signal amplitude respective pulses eddy current measurement probe
Face and steel tube surface are apart from size；
The treated ovality that can get steel pipe of the signal measuring of the impulse eddy current measuring probe of s4: multiple arrays.
2. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: described centering dress
It is set to mechanical centring device or photoelectric centering device.
3. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: the plurality of battle array
Row impulse eddy current measuring probe place plane perpendicular to steel pipe axial line and along steel pipe circumference 360 degree be evenly arranged, pulse
The excitation coil centrage of eddy current measurement probe and reception magneto sensor magnetic susceptibility are oriented parallel to steel pipe radially.
4. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: using can pulse-taking
Rush impulse eddy current measuring probe described in the square wave excitation of width.
5. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: described pulse whirlpool
The receiving portion of flow measurement probe adopts magnet-sensitive element.
6. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: described reception magnetic
Quick element adopts tmr sensor.
7. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: described pulse whirlpool
Flow measurement probe makes pulse current order pass through each excitation coil using time-sharing exciting.
8. steel pipe ovality array pulsed eddy current measuring method according to claim 1 it is characterised in that: described pulse whirlpool
The detection signal of flow measurement probe is processed using time-multiplexed method.
9. a kind of steel pipe ovality array pulsed eddy current being applied to arbitrary described measuring method in claim 1 to 8 measures
Device it is characterised in that: include measurement assembly and mechanical component, measurement assembly include pulse excitation source, array arrangement multiple
Impulse eddy current measuring probe, amplifier, wave filter, a/d capture card and computer, mechanical component includes centralising device and dress of advancing
Put, steel pipe is carried out centering by described centralising device, described moving device drives described steel pipe to pass through described impulse eddy current measurement to visit
The array center of head；Described impulse eddy current measuring probe includes excitation coil and receives magneto sensor；Described pulse excitation source is divided
When row energization is entered to described impulse eddy current measuring probe, described reception magneto sensor measures described steel tube surface changes of magnetic field, according to
According to the measuring surface of described impulse eddy current measuring probe and described steel tube surface apart from size corresponding output relevant voltage, Duo Gesuo
The measurement signal stating impulse eddy current measuring probe is acquired by time-multiplexed method, collection signal amplified device amplification,
After filter filtering, then snap into computer and processed by a/d collection, after calculating, obtain steel pipe ovality information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610885110.XA CN106352787A (en) | 2016-10-11 | 2016-10-11 | Array pulsed eddy current measurement method and device for ovality of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610885110.XA CN106352787A (en) | 2016-10-11 | 2016-10-11 | Array pulsed eddy current measurement method and device for ovality of steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106352787A true CN106352787A (en) | 2017-01-25 |
Family
ID=57866941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610885110.XA Pending CN106352787A (en) | 2016-10-11 | 2016-10-11 | Array pulsed eddy current measurement method and device for ovality of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106352787A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167516A (en) * | 2017-05-24 | 2017-09-15 | 昆明理工大学 | Double difference dynamic formula pulse eddy current probe unit, array probe and detection means |
| CN107219297A (en) * | 2017-07-14 | 2017-09-29 | 西安热工研究院有限公司 | Magnetosensitive phased array probe assembly and method |
| CN107869972A (en) * | 2017-12-21 | 2018-04-03 | 苏州临点三维科技有限公司 | Cylinder inboard wall planeness measuring apparatus |
| CN108106573A (en) * | 2017-12-21 | 2018-06-01 | 苏州临点三维科技有限公司 | Cylinder outboard sidewalls planeness measuring apparatus |
| CN108106574A (en) * | 2017-12-21 | 2018-06-01 | 苏州临点三维科技有限公司 | Column side wall planeness measuring apparatus |
| CN110220969A (en) * | 2019-06-28 | 2019-09-10 | 苏州大学 | A kind of magnetic leakage detecting probe with high sensitivity |
| CN112083062A (en) * | 2019-06-13 | 2020-12-15 | 宝山钢铁股份有限公司 | Square billet corner surface defect detection method based on eddy current flaw detection |
| CN112197685A (en) * | 2020-09-29 | 2021-01-08 | 华中科技大学 | Metal tube wall thickness measuring method and device based on motional eddy current |
| CN112378994A (en) * | 2020-11-09 | 2021-02-19 | 华东理工大学 | Electromagnetic detection probe for deep defects of metal component based on TMR magnetoresistive sensor array |
| CN113776425A (en) * | 2020-06-09 | 2021-12-10 | 英飞凌科技股份有限公司 | Inductive angle sensor with tension coil |
| CN112378994B (en) * | 2020-11-09 | 2024-04-30 | 华东理工大学 | Electromagnetic detection probe for deep defects of metal component based on TMR (total magnetic resistance) magnetoresistive sensor array |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29823433U1 (en) * | 1998-04-02 | 1999-08-12 | Fraunhofer Ges Forschung | Device for measuring the contour of the body of a melting electrode shoe holder |
| CN201269741Y (en) * | 2008-09-18 | 2009-07-08 | 武汉理工大学 | Ellipticity measurement instrument for rotary kiln |
| CN201527262U (en) * | 2009-10-21 | 2010-07-14 | 上海宝钢设备检修有限公司 | Mechanism for measuring excircle diameter and circularity of pipe body |
| CN101839685A (en) * | 2010-06-11 | 2010-09-22 | 天津大学 | Measurement device and method for wire roundness based on electromagnetic sensor |
| CN102072694A (en) * | 2010-12-15 | 2011-05-25 | 北京经纬恒润科技有限公司 | Eddy current distance sensor |
| CN102842059A (en) * | 2012-06-01 | 2012-12-26 | 北京物资学院 | RFID (Radio Frequency Identification devices) tag with approached type sensitive device, RFID system and object distance detecting method |
| CN103063126A (en) * | 2012-12-25 | 2013-04-24 | 中国石油集团川庆钻探工程有限公司 | Coiled tubing ovality testing method |
| CN104266579A (en) * | 2014-10-08 | 2015-01-07 | 北京航空航天大学 | Method for extracting signal characteristic quantity for carrying out impulse eddy current detection on ferromagnetic component |
| CN104540609A (en) * | 2012-06-20 | 2015-04-22 | 达涅利自动化有限公司 | Apparatus to detect the deformity in thickness of tubular elements and corresponding method |
| CN105510433A (en) * | 2016-02-05 | 2016-04-20 | 四川大学 | Metal pipe electromagnetic nondestructive testing device based on motional eddy current |
| CN105891323A (en) * | 2014-11-21 | 2016-08-24 | 中机生产力促进中心 | Eddy probe array for detecting pipeline deformation |
-
2016
- 2016-10-11 CN CN201610885110.XA patent/CN106352787A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29823433U1 (en) * | 1998-04-02 | 1999-08-12 | Fraunhofer Ges Forschung | Device for measuring the contour of the body of a melting electrode shoe holder |
| CN201269741Y (en) * | 2008-09-18 | 2009-07-08 | 武汉理工大学 | Ellipticity measurement instrument for rotary kiln |
| CN201527262U (en) * | 2009-10-21 | 2010-07-14 | 上海宝钢设备检修有限公司 | Mechanism for measuring excircle diameter and circularity of pipe body |
| CN101839685A (en) * | 2010-06-11 | 2010-09-22 | 天津大学 | Measurement device and method for wire roundness based on electromagnetic sensor |
| CN102072694A (en) * | 2010-12-15 | 2011-05-25 | 北京经纬恒润科技有限公司 | Eddy current distance sensor |
| CN102842059A (en) * | 2012-06-01 | 2012-12-26 | 北京物资学院 | RFID (Radio Frequency Identification devices) tag with approached type sensitive device, RFID system and object distance detecting method |
| CN104540609A (en) * | 2012-06-20 | 2015-04-22 | 达涅利自动化有限公司 | Apparatus to detect the deformity in thickness of tubular elements and corresponding method |
| CN103063126A (en) * | 2012-12-25 | 2013-04-24 | 中国石油集团川庆钻探工程有限公司 | Coiled tubing ovality testing method |
| CN104266579A (en) * | 2014-10-08 | 2015-01-07 | 北京航空航天大学 | Method for extracting signal characteristic quantity for carrying out impulse eddy current detection on ferromagnetic component |
| CN105891323A (en) * | 2014-11-21 | 2016-08-24 | 中机生产力促进中心 | Eddy probe array for detecting pipeline deformation |
| CN105510433A (en) * | 2016-02-05 | 2016-04-20 | 四川大学 | Metal pipe electromagnetic nondestructive testing device based on motional eddy current |
Non-Patent Citations (4)
| Title |
|---|
| 于润桥等: "基于涡流传感器的连续油管椭圆度在线检测技术研究", 《科学技术与工程》 * |
| 康宜华等: "移动式连续管检测系统设计", 《石油机械》 * |
| 徐君等: "InSb磁敏电阻脉冲涡流传感器的研究", 《仪器仪表学报》 * |
| 梅旭涛等: "连续油管超声检测系统壁厚与椭圆度测量方案", 《石油矿场机械》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167516B (en) * | 2017-05-24 | 2023-09-26 | 昆明理工大学 | Double differential pulse eddy current probe unit, array probe and detection device |
| CN107167516A (en) * | 2017-05-24 | 2017-09-15 | 昆明理工大学 | Double difference dynamic formula pulse eddy current probe unit, array probe and detection means |
| CN107219297B (en) * | 2017-07-14 | 2023-08-25 | 西安热工研究院有限公司 | Magneto-sensitive phased array detection assembly and method |
| CN107219297A (en) * | 2017-07-14 | 2017-09-29 | 西安热工研究院有限公司 | Magnetosensitive phased array probe assembly and method |
| CN107869972A (en) * | 2017-12-21 | 2018-04-03 | 苏州临点三维科技有限公司 | Cylinder inboard wall planeness measuring apparatus |
| CN108106573A (en) * | 2017-12-21 | 2018-06-01 | 苏州临点三维科技有限公司 | Cylinder outboard sidewalls planeness measuring apparatus |
| CN108106574A (en) * | 2017-12-21 | 2018-06-01 | 苏州临点三维科技有限公司 | Column side wall planeness measuring apparatus |
| CN112083062A (en) * | 2019-06-13 | 2020-12-15 | 宝山钢铁股份有限公司 | Square billet corner surface defect detection method based on eddy current flaw detection |
| CN110220969A (en) * | 2019-06-28 | 2019-09-10 | 苏州大学 | A kind of magnetic leakage detecting probe with high sensitivity |
| CN110220969B (en) * | 2019-06-28 | 2024-04-12 | 苏州大学 | Magnetic flux leakage detection probe with high sensitivity |
| CN113776425A (en) * | 2020-06-09 | 2021-12-10 | 英飞凌科技股份有限公司 | Inductive angle sensor with tension coil |
| CN112197685A (en) * | 2020-09-29 | 2021-01-08 | 华中科技大学 | Metal tube wall thickness measuring method and device based on motional eddy current |
| CN112378994A (en) * | 2020-11-09 | 2021-02-19 | 华东理工大学 | Electromagnetic detection probe for deep defects of metal component based on TMR magnetoresistive sensor array |
| CN112378994B (en) * | 2020-11-09 | 2024-04-30 | 华东理工大学 | Electromagnetic detection probe for deep defects of metal component based on TMR (total magnetic resistance) magnetoresistive sensor array |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106352787A (en) | Array pulsed eddy current measurement method and device for ovality of steel pipe | |
| US6847207B1 (en) | ID-OD discrimination sensor concept for a magnetic flux leakage inspection tool | |
| CN205720097U (en) | A kind of steel wire rope nondestructive inspection system | |
| CN110057904B (en) | Method and device for quantitatively detecting defects of moving metal component | |
| US10254250B2 (en) | Rotating current excitation with array magnetic sensors nondestructive testing probe for tube inspection | |
| CN205861255U (en) | Ferromagnetic material stress based on barkhausen detection device | |
| CN109115868B (en) | Defect depth detection device and method based on pulse eddy current | |
| CA2630050A1 (en) | Pulsed eddy current pipeline inspection system and method | |
| CN104297338A (en) | Pulse eddy current detecting system based on rectangular difference probe | |
| CN106289042A (en) | A kind of steel pipe residual wall thickness magnetization pulse eddy current measuring method and device | |
| CN104049031A (en) | Subsurface defect detection device and method based on alternative current electromagnetic field | |
| CN106645393B (en) | Inspection imaging probe and method in aviation non-ferromagnetic metal pipe corrosion defect | |
| CN108152362B (en) | Method for detecting defects of steel structure through magnetostriction based on pseudorandom sequence | |
| CN114113307A (en) | Omnidirectional defect detection device and method for coiled tubing | |
| CN204255904U (en) | Based on the Pulsed Eddy Current Testing System of rectangle difference detector | |
| CN202101974U (en) | Electromagnetic-acoustic transducer (EMAT) for detection of condenser stainless steel bellows | |
| CN109060939A (en) | Steel rail defect checking method for width based on leakage magnetic detection device | |
| CN105092691B (en) | A kind of quantitative detecting method and detector of the accumulation of pipeline internal oxidition skin | |
| CN105241951A (en) | Non-magnetic conductor material electromagnetic eddy current detection apparatus | |
| CN106404924A (en) | Detection data optimization processing method for improving plate-like structure imaging precision | |
| CN113155009A (en) | Metal sleeve spacing pulse eddy current detection method and device | |
| CN206160930U (en) | Steel pipe ovality array pulsed eddy current measuring device | |
| CN113155954B (en) | Pulse eddy current detection system and method for detecting defects of conductor structure | |
| CN109668505A (en) | A kind of pulse ACFM ferromagnetic metal structure wall thickness measurement method | |
| CN104614444B (en) | Method for improving electromagnetic ultrasonic detection precision |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170125 |
|
| RJ01 | Rejection of invention patent application after publication |