CN102798666A - Axial crack defect internal detector for pipe wall based on magnetostrictive effect - Google Patents
Axial crack defect internal detector for pipe wall based on magnetostrictive effect Download PDFInfo
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- CN102798666A CN102798666A CN2012102771809A CN201210277180A CN102798666A CN 102798666 A CN102798666 A CN 102798666A CN 2012102771809 A CN2012102771809 A CN 2012102771809A CN 201210277180 A CN201210277180 A CN 201210277180A CN 102798666 A CN102798666 A CN 102798666A
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Abstract
The invention discloses an axial crack defect internal detector for pipe wall based on the magnetostrictive effect. The axial crack defect internal detector runs forward under the driving of media in a pipeline, and detects axial crack defects of the pipe wall during the running process. The internal detector comprises an electric sealed cabin, a plurality of ultrasonic sensors based on magnetostrictive effect and a driver, wherein the electric sealed cabin is internally provided with a data collecting part, a signal processing part and a data storage part; two ends of the electric sealed cabin are respectively provided with a set of support wheels which are ranked circumferentially; the plurality of ultrasonic sensors based on the magnetostrictive effect are connected out of the electric sealed cabin in a circumferential arrangement mode, and are tightly close to the inner wall of a pipeline; each ultrasonic sensor comprises a permanent magnet, an ultrasonic coil and a spring support; the ultrasonic coil is positioned between the pole N and pole S of the permanent magnet; the spring support is connected between the permanent magnet and the ultrasonic coil; the driver is connected with the electric sealed cabin through a universal joint; and two ends of the driver are respectively provided with a set of support wheels which are arranged circumferentially, and a plurality of staggered mileage wheels are arranged one set of the two sets of support wheels which are arranged circumferentially.
Description
Technical field
The invention relates to technical field of nondestructive testing, particularly relevant for a kind of can be applicable to long distance pipeline based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect.
Background technology
Along with the high speed development of long distance pipeline forwarding business, Natural Gas Demand is explosive growth, and the big discharge capacity natural gas line of high pressure transportation system is day by day huge.Particularly begin since transfering natural gas from the west to the east one line uses the X70 pipe line steel, the high-grade pipe step material is promoted and grade of steel constantly strengthens.Along with the pipeline service time constantly increases; Local defect on the pipeline constantly increases and worsens; This has brought huge challenge for the safe operation of the big discharge capacity gas pipe line of high pressure; Particularly, cause significant damage for national economy and social safety owing to the pernicious security incident of pipeline explosion that can not in time find to cause along the stress corrosion cracking (SCC) defective (SCC) of pipeline axial.
In order to reduce operation risk, need regularly detect the pipe safety state.Obtain the defect information on the body so that the security of pipeline is estimated through detection.At present, the most frequently used inner detection technique of oil and gas pipes detection is Magnetic Flux Leakage Inspecting (MFL) technology.But this technology can't detect the slender type crack like defect on the body, particularly axial crack defective.And there is inconvenience in conventional piezoelectric supersonic detection method because of the needs couplant.Electromagnetic acoustic (EMAT) detects has noncontact, no coupling, good reproducibility, resolution advantages of higher, is to solve a kind of practicable method that the gas transmission pipeline crack defect detects at present.
Summary of the invention
The objective of the invention is; Provide a kind of based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; Its ultrasonic sensor can inspire ultrasound wave in tube wall, the ultrasound wave that excites is circumferentially propagated along tube wall, when running into the axial crack defective, reflects; Obtain the acoustic reflection signal of axial crack defective in the tube wall through receiving sensor, thereby reach purpose axial crack defects detection identification in the tube wall.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
A kind of based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; Pick-up unit operation forward under pipeline internal medium drives detects tube wall axial crack defective in operational process, wherein in said; Pick-up unit comprises in said: electric pressurized capsule; Be provided with part of data acquisition in it, signal data processing section and data storage part, the two ends of electric pressurized capsule respectively a cover circumferential array be provided with support wheel; A plurality of ultrasonic sensors based on magnetostrictive effect; Be connected to its circumferential array outside the electric pressurized capsule; And be close to inner-walls of duct, each ultrasonic sensor comprises permanent magnet, ultrasound wave coil and spring suppport; The ultrasound wave coil is between the N of the permanent magnet utmost point and the S utmost point, and spring suppport is connected between permanent magnet and the ultrasound wave coil; Driver; It links to each other with electric pressurized capsule through universal joint; The driver two ends are respectively equipped with the support wheel of a cover circumferential array, and in the support wheel of said electric pressurized capsule and the support wheel of driver, wherein the support wheel of a cover circumferential array is provided with a plurality of staggered mileage wheels.
Aforesaid based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; Said a plurality of ultrasonic sensor based on magnetostrictive effect forms two group of ultrasonic sensors of arranged crosswise, and every group of ultrasonic sensor circumferentially is connected outside the said electric pressurized capsule respectively equably.
Aforesaid based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, the sensor control section of said ultrasonic sensor is between said permanent magnet and ultrasound wave coil.
Aforesaid said driver also comprises speed control unit and driving leather based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, the front end connection speed control module of driving leather.Wherein, pick-up unit moved in desirable velocity range in speed control unit was guaranteed.
Aforesaid based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; Said ultrasound wave coil comprises ultrasonic excitation coil and the ultrasound wave receiving coil that central shaft is consistent, and said ultrasonic excitation coil and ultrasound wave receiving coil are made up of folding shape coil respectively.
Aforesaid based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; Said ultrasonic excitation coil excitation ultrasound ripple in tube wall, the relation of its ultrasonic propagation direction and broken line spacing is sin θ=c/2Df, wherein; θ is the angle of sonic propagation direction and tested pipeline surface normal; C is a velocity of wave, and f is a frequency of sound wave, and D is the folding spacing.
Aforesaid based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, said θ=90 degree, sin θ=1, D=c/2f, promptly the broken line space D is the half the of ultrasound wave wavelength λ.
Aforesaid based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, three said mileage wheels are staggered to be arranged in the said support wheel of a cover circumferential array of the rear side of said electric pressurized capsule.
The characteristics and the advantage of the embodiment of the invention are:
1, it is based on the ultrasonic sensor of magnetostrictive effect; Utilize magnetostrictive effect and the back wash effect thereof of ferrimagnet under alternating magnetic field and constant bias magnetic field; Thereby realized the natural gas line noncontact, do not had the coupling detection, had good reproducibility, resolution advantages of higher.
2, its ultrasonic sensor adopts permanent magnet in tube wall, to realize the bias magnetic field that sensor is required, and the bias magnetic field direction in the tube wall is parallel with cell winding, has adopted spring suppport to guarantee that the ultrasound wave coil is close to inner-walls of duct simultaneously.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect of the embodiment of the invention;
Fig. 2 is the local enlarged diagram based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect of the embodiment of the invention;
Fig. 3 is the distribution schematic diagram of ultrasonic sensor in tube wall based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect of the embodiment of the invention;
Fig. 4 is the synoptic diagram based on the ultrasonic sensor of pick-up unit in the tube wall axial crack defective of magnetostrictive effect of the embodiment of the invention;
Fig. 5 is the sonic propagation direction synoptic diagram based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect of the embodiment of the invention;
Fig. 6 be the embodiment of the invention based on the wave beam of pick-up unit in the tube wall axial crack defective of magnetostrictive effect diffusion synoptic diagram, wherein the ultrasound wave coil of Fig. 6 presents the state of overlooking behind ultrasound wave coil rotation 90 degree among Fig. 4;
Fig. 7 is that the sound wave based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect of the embodiment of the invention receives synoptic diagram.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Like Fig. 1; Fig. 2 and shown in Figure 4; The embodiment of the invention has proposed a kind of based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, and the operation forward under pipeline internal medium drives of said interior pick-up unit detects tube wall axial crack defective in operational process.Pick-up unit comprises electric pressurized capsule 1 in said, driver 2 and a plurality of ultrasonic sensors based on magnetostrictive effect, and ultrasonic sensor for example can adopt electromagnetic acoustic (EMAT) sensor.Be provided with part of data acquisition 1a in the electric pressurized capsule 1, signal data processing section 1b and data storage part 1c, the two ends of electric pressurized capsule 1 are respectively equipped with the support wheel 4 of a cover circumferential array.Be connected outside the electric pressurized capsule 1 to a plurality of ultrasonic sensor circumferential array based on magnetostrictive effect; And be close to tube wall; Each ultrasonic sensor comprises permanent magnet 3a; Ultrasound wave coil 3b and spring suppport 3c, ultrasound wave coil 3b are between the N of the permanent magnet 3a utmost point and the S utmost point, and spring suppport 3c is connected between permanent magnet 3a and the ultrasound wave coil 3b.Driver 2 links to each other with electric pressurized capsule 1 through universal joint 6; Driving electric pressurized capsule 1 moves in pipeline; The two ends of driver 2 also are respectively equipped with the support wheel of a cover circumferential array, and in the support wheel 4 of said electric pressurized capsule 1 and the support wheel 4 of driver 2, wherein the support wheel 4 of a cover circumferential array is provided with a plurality of staggered mileage wheels 5; Herein, the support wheel 4 of a cover circumferential array of the staggered rear side that is arranged in said electric pressurized capsule 1 of three mileages wheel 5.Pick-up unit was roughly concentric with pipeline in support wheel 4 guaranteed, the mileage information of mileage wheel 5 record detecting device operations.
Wherein, said part of data acquisition 1a, signal data processing section 1b and data storage part 1c are electrically connected.
In the embodiment of the invention, ultrasonic sensor adopts the pulse echo technology, promptly hyperacoustic excite and receive through same ultrasonic sensor accomplish.Spring suppport 3c is connected between permanent magnet 3a and the ultrasound wave coil 3b, makes ultrasound wave coil 3b can keep pressing close to inner-walls of duct.In addition, present embodiment has also been realized the noncontact of natural gas line is not detected with having to be coupled, and has good reproducibility and resolution advantages of higher.
The sensor control section 3d of said ultrasonic sensor is between said permanent magnet 3a and ultrasound wave coil 3b, and the structure of pick-up unit is compact more in making, it is more reasonable to connect up.Sensor control section 3d is used for controlling ultrasonic sensor and excites and receive ultrasound wave.
The detection method of present embodiment is following:
(1) interior pick-up unit is put into pipeline after, driver 2 drives electric pressurized capsule 1 and in tube wall, moves, and makes ultrasound wave coil 3b press close to inner-walls of duct through spring suppport 3c; When interior pick-up unit moves in pipeline; Supported by support wheel 4 and mileage wheel 5, pick-up unit is roughly concentric with pipeline in can guaranteeing, the mileage signal that pick-up unit was moved in the mileage wheel can be used for detecting; In service, data storage part 1c receives the mileage signal of mileage wheel 5;
(2) permanent magnet 3a sets up one and is parallel to the axial constant bias magnetic field of ferromagnetic pipeline in the tube wall based on the ultrasonic sensor place of magnetostrictive effect;
(3) being positioned at sensor on the sensor control section 3d of ultrasonic sensor excites the unit will feed the sinusoidal burst pulse of high frequency at the ultrasonic excitation coil based on the ultrasonic sensor of magnetostrictive effect; Under the electromagnetic induction effect, exchange current will be at the local alternating magnetic field that produces of ultrasonic excitation coil.The tube wall of being close to the ultrasonic excitation coiler part produces ultrasound wave based on magnetostrictive effect in tube wall under the acting in conjunction in alternating magnetic field and constant bias magnetic field, the ultrasound wave of generation is circumferentially propagated along tube wall perpendicular to coil;
(4) ultrasound wave is in the circumferential communication process of tube wall, runs into along the crack defect of pipeline axial etc. unusually and be reflected, and the ultrasound wave receiving coil that reflection wave is positioned in the ultrasonic excitation sensor receives;
(5) according to the assay intervals that pre-sets, every range ability at a distance from regular length, data storage part 1c just can excite/receive ultrasound wave through HSDA part 1a notice sensor control section 3d in current location.The ultrasonic sensor of magnetostrictive effect is accomplished emission and is received.After continuing to move a SI, mass data storage part 1c excites/receives ultrasound wave through HSDA part 1a notice sensor control section 3d once more, circulates according to this and detects up to accomplishing whole pipe;
(6) in the pipeline operational process, the certificate of being obtained by HSDA part 1a is transmitted to mass data storage part 1c after handling, compress, pack the early stage of signal data processing section 1b.After the detection of accomplishing whole pipe, with data dump in the data analysis computing machine.
(7) in the data analysis computing machine, analyze based on the received waveform of ultrasound wave receiving coil in the ultrasonic sensor of magnetostrictive effect, obtain the unusual concrete shape and size size of tube wall.
According to an embodiment of the invention; Cooperate shown in Figure 3 again; Said a plurality of ultrasonic sensor based on magnetostrictive effect forms two group of ultrasonic sensors 3m, the 3n of arranged crosswise, and every group of ultrasonic sensor 3m, 3n circumferentially are connected outside the said electric pressurized capsule 1 respectively equably.That is to say; Present embodiment is equipped with two groups of ultrasonic sensor 3m, 3n, and every group all has a plurality of circumferentially evenly the layout or the equidistant ultrasonic sensor of arranging of circumference ring-type, because ultrasonic sensor sends ultrasound wave to both direction; Launch crosstalking each other between the sound wave for fear of ultrasonic sensor; Every group of ultrasonic sensor 3m and 3n have a plurality of ultrasonic sensors again, i.e. 3m1,3m2 ... With 3n1,3n2 ..., so can increase the spacing between the ultrasonic sensor on the same group.In addition; Between each ultrasonic sensor 3m1 that each ultrasonic sensor 3n1 of second group of ultrasonic sensor 3n, 3n2 lay respectively at first group of ultrasonic sensor 3m, the 3m2; Form the arranged crosswise form; When pick-up unit moves in pipeline so, can make the surveyed area of ultrasonic sensor cover whole body fully.Wherein, the group of ultrasonic sensors 3m of two magnetostrictive effects and 3n accomplish the emission reception successively according to the order of 3m1,3m2,3n1 and 3n2.
Said driver 2 also comprises driving leather 2a and speed control unit 2b.The end connection speed control module 2b of driving leather 2a.When the interior pick-up unit of present embodiment moves in pipeline; The support wheel 4 of driver 2 is used to guarantee that driver 2 and pipeline are roughly concentric; Driving leather 2a is that the operation of interior pick-up unit provides driving force; Whole device is the pipeline operation in the traction lower edge of driving leather 2a; With the proper speed operation, the travelling speed of pick-up unit was not more than 2m/s to pick-up unit in for example speed control unit 2b can make, and can gather optimal data information to guarantee cell winding 3b in pipeline in speed control unit 2b guaranteed.
In addition, the interior pick-up unit of present embodiment has four groups of support wheels 4 altogether, and comprises 3 mileage wheels 5 in one group of support wheel on electric pressurized capsule 1 right side, evenly distributes with 360 degree.
Said ultrasound wave coil 3b comprises ultrasonic excitation coil and ultrasound wave receiving coil; Said ultrasonic excitation coil and ultrasound wave receiving coil are made up of folding shape coil (claiming tortuous coil again) respectively; Like Fig. 6 and shown in Figure 7; The ultrasonic excitation coil is consistent with the central shaft of ultrasound wave receiving coil, and is maximum to guarantee the receiving ultrasound wave amplitude.Herein, the ultrasonic sensor coil adopts based on printed circuit board technology and makes, and circuit board simultaneously is the ultrasonic excitation coil, and one side is the ultrasound wave receiving coil, and the ultrasonic excitation coil is made as 3 circles, and the ultrasound wave receiving coil is made as 8 circles.
Shown in Figure 5 is sonic propagation direction synoptic diagram, the said ultrasonic sensor of present embodiment based on magnetostrictive effect, and the relation of its sonic propagation direction and broken line spacing is sin θ=c/2Df.Wherein, θ is the angle of sonic propagation direction and tested pipeline surface normal, and c is a velocity of wave, and f is a frequency of sound wave, and D is a folding shape coil-span.Furthermore, in the present embodiment, above-mentioned angle θ is 90 degree; Make broken line space D=c/2f, promptly ultrasound wave wavelength λ's is half the, is steady state value; At this moment, the ultrasonic excitation coil produces whole panel vibration and the fixing guided wave of pattern, perpendicular to rolling over the shape coil to the both sides radiation.
Like Fig. 6 and shown in Figure 7, the said ultrasonic sensor based on magnetostrictive effect of present embodiment excites with receiving coil and is folding shape coil, its middle polyline space D, height H, coil width W.
Shown in Figure 6 for the right half side wave beam of guided wave that excites of coil spreads synoptic diagram, the said ultrasonic sensor based on magnetostrictive effect of present embodiment is with definite main radiation direction and the ultrasound mode that gets into tested tube wall of broken line space D.
The hyperacoustic theoretical beam angle that the present invention excites is the single order diffraction theory, and is as shown in Figure 6.Ultrasonic propagation is certain be the distance of near field apart from N after; Beam angle is along with the distance with sensor increases and increases, and Beam Scattering angle γ (being the angle of velocity of sound diffusion edge and ultrasound line coil axis) is sin γ=κ λ/W with the relation of ultrasonic wavelength X and coil width W.
Receiving the ultrasound wave coil is the back wash effect that sensor angle γ is relied on.Reception amplitude from a mounting ultrasonic is the function of sensor receiving coil central shaft angular displacement (γ).As shown in Figure 7, be centered close to collinear ripple (γ=0 °) with the ultrasound wave receiving coil and have maximum reception amplitude, along with the increase of angle (γ＞0 °), identical ultrasonic reception amplitude will reduce.
After sensor based on magnetostrictive effect according to the invention passes through HSDA part 1a and signal data processing section 1b through the acoustic signals that receiving coil received; Deposit mass data storage part 1c in; To detect data dump after the end to be detected in the data analysis computing machine, analyze detecting data by data analyst, to assess the crack defect situation of tested pipeline; In conjunction with the corrosion detected status of pipeline, thus the Integrity Management of realization pipeline.
The concrete testing process of present embodiment is following:
(1) interior pick-up unit is put into pipeline after, the travelling speed of pick-up unit was not more than 2m/s in speed control unit 2b guaranteed, guaranteed that sensor excitation variable winding and receiving coil can gather optimal data information;
(2) after the mileage wheel triggered sampled signal, mass data storage part 1c just excited/receives ultrasound wave through HSDA part 1a notice sensor control section 3d in current location.The sensor excitation unit that is positioned on the sensor control section 3d will apply the sinusoidal burst pulse of high frequency at the ultrasonic excitation coil of ultrasonic sensor;
(3) under the electromagnetic induction effect, exchange current will produce alternating magnetic field.Under the acting in conjunction in alternating magnetic field and constant bias magnetic field, according to magnetostrictive effect and back wash effect thereof, the ultrasonic excitation coil will be launched the ultrasound wave perpendicular to winding wire, and this ultrasound wave is circumferentially propagated along tube wall;
(4) ultrasound wave runs into tube walls such as crackle, corrosion and is reflected unusually in the process of propagating, and reflection supersonic wave is received by the ultrasound wave receiving coil in the ultrasonic sensor;
(5) after passing through signal data processing section 1b, the ultrasound wave that is received based on the ultrasound wave receiving coil in the ultrasonic sensor of magnetostrictive effect deposits in HSDA part 1a and the mass data storage part 1c;
After the ultrasonic sensor 3m of (6) two groups of magnetostrictive effects and all ultrasonic sensors on the 3n are accomplished emission reception ultrasound wave successively; Move forward based on pick-up unit in the magnetostrictive effect tube wall axial crack defective, behind a sampled distance, the mileage wheel triggers sampled signal; Repeat said process (2); (3), (4) are until the detection of accomplishing whole seized pipeline section;
(7) taking-up is according to the invention based on behind the pick-up unit in the magnetostrictive effect tube wall axial crack defective; In data to the data analysis computing machine in the dump mass data storage part 1c; Data analyst is to analyzing based on the received ultrasound wave waveform of the ultrasound wave receiving coil in the ultrasonic sensor of magnetostrictive effect; And compare with actual known tubes change in wall waveform pattern, obtain the unusual concrete shape and size size of tube wall.
The above is merely several embodiments of the present invention, and those skilled in the art can carry out various changes or modification to the embodiment of the invention and do not break away from the spirit and scope of the present invention according to application documents are disclosed.
Claims (8)
1. one kind based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; Pick-up unit operation forward under pipeline internal medium drives in said; In operational process, tube wall axial crack defective is detected, it is characterized in that, said interior pick-up unit comprises:
Electric pressurized capsule is provided with part of data acquisition in it, signal data processing section and data storage part, and the two ends of electric pressurized capsule are respectively equipped with the support wheel of a cover circumferential array;
A plurality of ultrasonic sensors based on magnetostrictive effect; Be connected to its circumferential array outside the electric pressurized capsule; And be close to inner-walls of duct, each ultrasonic sensor comprises permanent magnet, ultrasound wave coil and spring suppport; The ultrasound wave coil is between the N of the permanent magnet utmost point and the S utmost point, and spring suppport is connected between permanent magnet and the ultrasound wave coil;
Driver; It links to each other with electric pressurized capsule through universal joint; The driver two ends are respectively equipped with the support wheel of a cover circumferential array, and in the support wheel of said electric pressurized capsule and the support wheel of driver, wherein the support wheel of a cover circumferential array is provided with a plurality of staggered mileage wheels.
2. according to claim 1 based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; It is characterized in that; Said a plurality of ultrasonic sensor based on magnetostrictive effect forms two group of ultrasonic sensors of arranged crosswise, and every group of ultrasonic sensor circumferentially is connected outside the said electric pressurized capsule respectively equably.
3. according to claim 1 based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, it is characterized in that the sensor control section of said ultrasonic sensor is between said permanent magnet and ultrasound wave coil.
4. according to claim 1ly it is characterized in that based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect said driver also comprises speed control unit and driving leather, the front end connection speed control module of driving leather.
5. according to claim 1 based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; It is characterized in that; Said ultrasound wave coil comprises ultrasonic excitation coil and the ultrasound wave receiving coil that central shaft is consistent, and said ultrasonic excitation coil and ultrasound wave receiving coil are made up of folding shape coil respectively.
6. according to claim 1ly it is characterized in that said ultrasonic excitation coil excitation ultrasound ripple in tube wall based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect; The relation of its ultrasonic propagation direction and broken line spacing is sin θ=c/2Df; Wherein, θ is the angle of sonic propagation direction and tested pipeline surface normal, and c is a velocity of wave; F is a frequency of sound wave, and D is the folding spacing.
7. according to claim 6ly it is characterized in that based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect, said θ=90 degree, sin θ=1, D=c/2f, promptly the broken line space D is the half the of ultrasound wave wavelength λ.
8. according to claim 1ly it is characterized in that three said mileage wheels are staggered to be arranged in the said support wheel of a cover circumferential array of the rear side of said electric pressurized capsule based on pick-up unit in the tube wall axial crack defective of magnetostrictive effect.
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| CN103244830A (en) * | 2013-05-13 | 2013-08-14 | 天津大学 | Inner detection system for submarine pipelines and detection method thereof |
| CN103527933A (en) * | 2013-10-31 | 2014-01-22 | 济南大学 | Oil pipeline detection device |
| CN104330476A (en) * | 2014-09-22 | 2015-02-04 | 中国石油天然气集团公司 | Electromagnetic ultrasonic excitation probe design method |
| CN104567914A (en) * | 2013-10-24 | 2015-04-29 | 上海佳友市政建筑有限公司 | Pipeline track instrument provided with novel logging wheel |
| CN105465551A (en) * | 2016-01-25 | 2016-04-06 | 武汉大学 | Supporting type pipeline inside detection robot with flexibility self-adapting function |
| CN105674941A (en) * | 2014-11-21 | 2016-06-15 | 中国石油化工集团公司 | Pipeline double-row deformation detection mechanism |
| CN105864644A (en) * | 2016-06-21 | 2016-08-17 | 深圳市发利构件机械技术服务有限公司 | Intelligent detector for deep sea submarine pipelines and detection method |
| CN106989769A (en) * | 2017-05-28 | 2017-07-28 | 南昌理工学院 | A kind of sensing system and its detection method |
| CN108982670A (en) * | 2018-08-23 | 2018-12-11 | 湖州市特种设备检测研究院 | A kind of electromagnetic ultrasonic probe of water pipe non-destructive testing |
| US10175200B2 (en) | 2014-05-30 | 2019-01-08 | Prime Photonics, Lc | Methods and systems for detecting nonuniformities in a material, component, or structure |
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| CN103244830A (en) * | 2013-05-13 | 2013-08-14 | 天津大学 | Inner detection system for submarine pipelines and detection method thereof |
| CN103244830B (en) * | 2013-05-13 | 2016-02-24 | 天津大学 | A kind of for detection system in submarine pipeline and detecting method thereof |
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