CN106289042A - A kind of steel pipe residual wall thickness magnetization pulse eddy current measuring method and device - Google Patents
A kind of steel pipe residual wall thickness magnetization pulse eddy current measuring method and device Download PDFInfo
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- CN106289042A CN106289042A CN201610885179.2A CN201610885179A CN106289042A CN 106289042 A CN106289042 A CN 106289042A CN 201610885179 A CN201610885179 A CN 201610885179A CN 106289042 A CN106289042 A CN 106289042A
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- steel pipe
- eddy current
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- 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
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
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Abstract
The present invention relates to a kind of steel pipe residual wall thickness magnetization pulse eddy current measuring method and device, after steel pipe being implemented magnetization when total magnetic flux is constant, it is ensured that the magnetic induction that the magnetic induction in steel pipe is corresponding more than its maximum permeability point；Locally changing of thickness of steel pipe produces the change of body intrinsic inductance at this, and then changes the pcrmeability of this part body, and shows steel pipe top layer, causes the change of measured waveform；Array pulsed eddy current measuring probe be perpendicular to steel pipe axial line circumferentially 360 degree be evenly arranged, the excitation coil of impulse eddy current measuring probe and receive magneto sensor centrage along normal direction just to steel tube surface.To this end, during steel pipe partial wall thickness change, the amplitude of the Pulsed eddy current testing signal of output changes therewith, and after ellipticity measurement, revise signal amplitude, it is achieved noncontact thickness measuring.
Description
Technical field
The present invention relates to field of non destructive testing, be specifically related to a kind of steel pipe residual wall thickness magnetization pulse eddy current measuring method with
Device.
Background technology
Steel pipe implement is widely used in the operations such as oil gas field well workover, drilling well, completion, well logging.The thinning meeting of thickness of steel pipe
Cause steel pipe to bear pressure in many Oil/gas Wells operation process to reduce, easily cause down-hole accident.Therefore, the wall thickness parameter of steel pipe
Most important.Conventional ultrasonic thickness-measuring method needs couplant, speed slow.Thickness measuring in high-speed motion is a difficult problem for steel pipe thickness measuring.
Thickness measuring in noncontact and high-speed motion is a difficult problem for steel pipe thickness measuring.Electromagnetic ultrasonic thickness measuring can realize the little lift-off of noncontact and measure,
But stability and reliability are not enough, relatively difficult to achieve to in-service pipeline thickness measuring.
Summary of the invention
The technical problem to be solved be to provide a kind of steel pipe residual wall thickness magnetization pulse eddy current measuring method with
Device, the method is without coupling, can realize noncontact big lift-off measurement, adaptation high speed thickness measuring requirement, requiring low to steel tube surface.
The technical scheme is that a kind of steel pipe residual wall thickness magnetization pulse eddy current measurement
Method, comprises the following steps:
S1: by tested steel pipe partial uniform magnetization and reach some strength；
S2: excitation coil centrage and receive magneto sensor magnetic susceptibility direction just to steel tube surface normal direction, excitation coil and
Receive magneto sensor composition impulse eddy current measuring probe, the pcrmeability change on sensing steel pipe top layer；
The place plane of the impulse eddy current measuring probe that S3: multiple arrays are arranged is perpendicular to steel pipe axial line, multiple pulses
Eddy current measurement probe is evenly arranged along outer wall of steel pipe circumference 360 degree；
S4: described steel pipe moves relative to magnetizator and impulse eddy current measuring probe, Pulsed eddy current testing signal amplitude with
Thickness of steel pipe change correspondence, treated available steel pipe body wall thickness information.
Further, the described steel pipe device that is magnetized is magnetized into certain magnetic induction, and this magnetic induction is much larger than steel pipe magnetic
The pipe intrinsic inductance that conductance maximum point is corresponding.
Further, described magnetizator is through mode DC coil magnetizator or annular magnet magnetizator, it is achieved the axle of steel pipe
To magnetization.
Further, the square wave excitation impulse eddy current measuring probe of adjustable pulse-width is used.
Further, the receiving portion of described impulse eddy current measuring probe uses magnet-sensitive element.
Further, described reception magneto sensor uses TMR sensor.
Further, described impulse eddy current measuring probe uses time-sharing exciting to make pulse current order encourage line by each
Circle.
Further, the detection signal amplitude of described impulse eddy current measuring probe is by revising after ellipticity measurement.
The invention also discloses a kind of steel pipe residual wall thickness magnetization pulse eddy current measurement dress being applied to above-mentioned measuring method
Put, including magnetizator, pulse excitation source, impulse eddy current measuring probe, amplifier, wave filter, A/D capture card and computer, arteries and veins
Rush eddy current measurement probe include excitation coil and receive magneto sensor；Described magnetizator is used for magnetizing steel pipe, described pulse excitation
Impulse eddy current measuring probe is encouraged by source timesharing, receives the eddy current response signal that magneto sensor is measured, and different wall is corresponding
Different response signals, the most amplified device amplifies, filter filtering, then is sent at computer by A/D capture card
Reason, obtains steel pipe body wall thickness information after ovality correction.
Based on technique scheme, the invention has the beneficial effects as follows:
1) the thickness measuring system simple in construction of the present invention, it is adaptable to the high speed of thickness of steel pipe, automatization, non-cpntact measurement；
2) method using the pcrmeability change directly measuring workpiece surface in the present invention, wants steel tube surface clean conditions
Low, measurement process is asked to need not water coincidence；
3) present invention uses impulse eddy current to encourage, and instantaneous energy is big, and penetration power is strong, is suitable for big lift-off and measures.
Accompanying drawing explanation
Fig. 1 is measuring probe distribution schematic diagram in the present invention；
Fig. 2 is pulse square wave excitation figure in the present invention；
Fig. 3 is measurement apparatus schematic diagram in the present invention；
Fig. 4 is ferromagnetic steel pipe BH curve and permeability curcve；
Steel duct magnetic line of force distribution schematic diagram when Fig. 5 is wall thickness change.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, 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 residual wall thickness magnetization pulse eddy current measuring method, comprise the following steps:
S1: tested steel pipe 8 local uniform is magnetized and reaches some strength；
Line, just to steel pipe 8 surface normal, is encouraged in S2: excitation coil 31 centrage and reception magneto sensor 32 magnetic susceptibility direction
Circle 31 and reception magneto sensor 32 form impulse eddy current measuring probe, the pcrmeability change on sensing steel pipe 8 top layer；
The place plane of the impulse eddy current measuring probe 3 that S3: multiple arrays are arranged is perpendicular to steel pipe 8 axial line, multiple arteries and veins
Rush eddy current measurement probe 3 to be evenly arranged, as shown in Figure 1 along steel pipe 8 outer wall circumference 360 degree；
S4: described steel pipe 8 moves relative to magnetizator 1 and impulse eddy current measuring probe 3, Pulsed eddy current testing signal amplitude
Corresponding with steel pipe 8 wall thickness change, treated available steel pipe 8 body wall thickness information.
Further, described steel pipe 8 device 1 that is magnetized is magnetized into certain magnetic induction, and this magnetic induction is much larger than steel pipe 8
The pipe intrinsic inductance that pcrmeability maximum point is corresponding.
Further, described magnetizator 1 is through mode DC coil magnetizator or annular magnet magnetizator, it is achieved steel pipe 8
Axial magnetized.
Further, the square wave excitation impulse eddy current measuring probe 3 of adjustable pulse-width is used, as shown in Figure 2.
Further, the receiving portion of described impulse eddy current measuring probe 3 uses magnet-sensitive element.
Further, described reception magneto sensor 32 uses TMR sensor.
Further, described impulse eddy current measuring probe 3 uses time-sharing exciting to make pulse current order encourage line by each
Circle 31.
Further, the detection signal amplitude of described impulse eddy current measuring probe 3 is by revising after ellipticity measurement.
The invention also discloses a kind of steel pipe 8 residual wall thickness magnetization pulse eddy current measurement dress being applied to above-mentioned measuring method
Put, as it is shown on figure 3, include that magnetizator 1, pulse excitation source 2, impulse eddy current measuring probe 3, amplifier 4, wave filter 5, A/D adopt
Truck 6 and computer 7, impulse eddy current measuring probe includes excitation coil 31 and receives magneto sensor 32.
During measurement, described steel pipe 8 is after magnetizator 1 magnetizes, and described pulse excitation source 2 timesharing is to impulse eddy current measuring probe
3 encourage, and receive the eddy current response signal that magneto sensor 32 is measured, the corresponding different response signal of different wall, warp successively
Amplifier 4 amplifies, wave filter 5 filters, then is sent to computer 7 is processed, through ovality correction by A/D capture card 6
After obtain steel pipe 8 body wall thickness information.
Cardinal principle of the present invention is to change pcrmeability changes in distribution in the ferrimagnet caused based on wall-thickness measurement, ferromagnetic
Property steel pipe in, internal magnetic field increases along with applying the increase of dc magnetization field, and in material, pcrmeability is gradually increased to maximum
After present monotonous decreasing trend, ferromagnetic steel pipe-curve and permeability curcve are as shown in Figure 4.As it is shown in figure 5, when there is wall thickness
During change, magnetic strength alignment steel duct direction produces disturbance, causes distorted magnetic field so that above wall thickness change, adjacent domain produces
Large range of pcrmeability distorts, and is diffused into the outer wall top layer that steel pipe inner wall defect is corresponding, present with without at wall thickness change not
Same permeability characteristics, when pulse excitation field is applied to this pcrmeability distorted region, the induced field that top layer eddy current produces will
Change, use measurement to receive magneto sensor and directly pick up the induced field of this distortion, can be achieved with pcrmeability distortion district
The measurement in territory, obtains the wall thickness information of steel pipe to be measured.
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 etc. made, should be included within the scope of the present invention.
Claims (9)
1. a steel pipe residual wall thickness magnetization pulse eddy current measuring method, it is characterised in that comprise the following steps:
S1: by tested steel pipe partial uniform magnetization and reach some strength；
S2: excitation coil centrage and reception magneto sensor magnetic susceptibility direction are just to steel tube surface normal direction, excitation coil and reception
Magneto sensor composition impulse eddy current measuring probe, the pcrmeability change on sensing steel pipe top layer；
The place plane of the impulse eddy current measuring probe that S3: multiple arrays are arranged is perpendicular to steel pipe axial line, multiple impulse eddy currents
Measuring probe is evenly arranged along outer wall of steel pipe circumference 360 degree；
S4: described steel pipe moves relative to magnetizator and impulse eddy current measuring probe, Pulsed eddy current testing signal amplitude and steel pipe
Wall thickness change is corresponding, treated available steel pipe body wall thickness information.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: described steel pipe
The device that is magnetized is magnetized into certain magnetic induction, magnetic strength in the pipe that this magnetic induction is corresponding much larger than steel pipe pcrmeability maximum point
Answer intensity.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: described magnetization
Device is through mode DC coil magnetizator or annular magnet magnetizator, it is achieved the axial magnetized of steel pipe.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: use adjustable
Impulse eddy current measuring probe described in the square wave excitation of pulse width.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: described pulse
The receiving portion of eddy current measurement probe uses magnet-sensitive element.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: described connects
Receive magneto sensor and use TMR sensor.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: described pulse
Eddy current measurement probe uses time-sharing exciting to make pulse current order by each excitation coil.
Steel pipe residual wall thickness magnetization pulse eddy current measuring method the most according to claim 1, it is characterised in that: described pulse
The detection signal amplitude of eddy current measurement probe is by revising after ellipticity measurement.
9. the steel pipe residual wall thickness magnetization pulse eddy current being applied to measuring method as described in arbitrary in claim 1 to 8 is surveyed
Amount device, it is characterised in that: include that magnetizator, pulse excitation source, impulse eddy current measuring probe, amplifier, wave filter, A/D adopt
Truck and computer, impulse eddy current measuring probe includes excitation coil and receives magneto sensor；Described magnetizator is used for magnetizing steel
Pipe, impulse eddy current measuring probe is encouraged by described pulse excitation source timesharing, receives the eddy current response letter that magneto sensor is measured
Number, the most amplified device amplifies, filter filtering, then is sent to computer by A/D capture card and processes, through ovality
Steel pipe body wall thickness information is obtained after correction.
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Cited By (8)
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| CN107132179A (en) * | 2017-07-04 | 2017-09-05 | 爱德森（厦门）电子有限公司 | The integrated apparatus for evaluating and method of a kind of corrosion conditions of reinforcement |
| CN108226277A (en) * | 2017-12-28 | 2018-06-29 | 哈尔滨工业大学 | The outer detection probe of a kind of leakage field, electromagnetic acoustic and vortex composite pipeline |
| CN109654990A (en) * | 2019-01-09 | 2019-04-19 | 中国石油大学(华东) | A kind of coiled tubing wall thickness on-line measurement probe based on pulse ACFM |
| CN110662943A (en) * | 2017-05-26 | 2020-01-07 | 阿莱戈微***有限责任公司 | Target for coil-excited position sensor |
| CN110672001A (en) * | 2019-10-24 | 2020-01-10 | 中航通飞华南飞机工业有限公司 | Method and device for measuring thickness of non-ferromagnetic material on surface of ferromagnetic material |
| CN111281569A (en) * | 2020-02-17 | 2020-06-16 | 华中科技大学同济医学院附属协和医院 | Magnetic induction probe for accurate positioning of focus |
| 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 |
| CN114440805A (en) * | 2022-01-26 | 2022-05-06 | 武汉华宇一目检测装备有限公司 | Electromagnetic ultrasonic thickness measuring device and method for drill pipe |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110662943A (en) * | 2017-05-26 | 2020-01-07 | 阿莱戈微***有限责任公司 | Target for coil-excited position sensor |
| US11320496B2 (en) | 2017-05-26 | 2022-05-03 | Allegro Microsystems, Llc | Targets for coil actuated position sensors |
| CN107132179A (en) * | 2017-07-04 | 2017-09-05 | 爱德森（厦门）电子有限公司 | The integrated apparatus for evaluating and method of a kind of corrosion conditions of reinforcement |
| CN108226277A (en) * | 2017-12-28 | 2018-06-29 | 哈尔滨工业大学 | The outer detection probe of a kind of leakage field, electromagnetic acoustic and vortex composite pipeline |
| CN109654990A (en) * | 2019-01-09 | 2019-04-19 | 中国石油大学(华东) | A kind of coiled tubing wall thickness on-line measurement probe based on pulse ACFM |
| CN110672001A (en) * | 2019-10-24 | 2020-01-10 | 中航通飞华南飞机工业有限公司 | Method and device for measuring thickness of non-ferromagnetic material on surface of ferromagnetic material |
| CN111281569A (en) * | 2020-02-17 | 2020-06-16 | 华中科技大学同济医学院附属协和医院 | Magnetic induction probe for accurate positioning of focus |
| 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 |
| CN114440805A (en) * | 2022-01-26 | 2022-05-06 | 武汉华宇一目检测装备有限公司 | Electromagnetic ultrasonic thickness measuring device and method for drill pipe |
| CN114440805B (en) * | 2022-01-26 | 2024-01-02 | 武汉华宇一目检测装备有限公司 | Electromagnetic ultrasonic thickness measuring device and thickness measuring method for drill rod |
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