CN107817292A - The whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography - Google Patents
The whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography Download PDFInfo
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- CN107817292A CN107817292A CN201711041956.6A CN201711041956A CN107817292A CN 107817292 A CN107817292 A CN 107817292A CN 201711041956 A CN201711041956 A CN 201711041956A CN 107817292 A CN107817292 A CN 107817292A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/0672—Imaging by acoustic tomography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/263—Surfaces
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- Pathology (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography, including：Ring-shaped emission transducer array and circumferential receptacle transducer array are arranged along pipe circumference direction, are respectively used to launch and are received Corkscrews Lamb wave, each transducer unit includes：Permanent magnet；Circular hole is provided with one diagonal of tortuous coil, to be connected by non-magnetic toroid with other coils with an array；Toroid is provided with buckle, with position of the tortuous coil of fixation on toroid, and tortuous coil can follow toroidal movement and rotate, and toroid is along the circumferential direction surrounded on the outer wall of pipeline, and straight condition is in, and can and axial movement circumferentially mobile around pipeline.The transducer can move annular transmitting transducer arrays and circumferential receptacle transducer array by toroid, and transducer can flexibly move along pipeline when realizing detection, so as to accurately detect defect of pipeline, effectively improve flexibility and the reliability of transducer.
Description
Technical field
The present invention relates to defect inspection and health monitoring technique field, pair of more particularly to a kind of guided wave tomography
The whole directive property Corkscrews Lamb wave transducer of array adjustable.
Background technology
Pipeline transportation has the advantages that cost ineffective rate is high, is widely used in oil, natural gas, plumbing, chemical industry, electricity
The multiple fields such as power.But pipeline is during long-term use, due to being stressed, the factor such as burn into artificial damage, can not keep away
There are various defects with exempting from, safe operation of these defects to pipeline constitutes a serious threat, and with the growth of energy demand
And the quickening of urbanization process, pipeline will play an important role in national economic development and people's lives.Therefore, to pipe
Road carries out periodic detection, grasps pipeline actual operating state, and carries out timely processing the defects of to being likely to occur or having occurred,
It is the important method for ensureing pipeline stabilization operation.
At present, it is a kind of effective manner to carry out Non-Destructive Testing to pipeline using supersonic guide-wave, and guided waves propagation distance is remote, declines
Reduce, there is the advantages of detection range wide efficiency high, increasingly paid close attention to by Non-Destructive Testing professional.Wherein, excitation is super
The transducer of guided Waves is mostly PZT (piezoelectric transducer), due to needing fluid couplant, so that it is of limited application, and electromagnetism
Ultrasonic transducer has non-contact the characteristics of need not coupling, and is swashed based on Lorentz force and magnetostrictive effect in object is detected
Supersonic guide-wave is sent out, suitable for the pipe detection under a variety of environment.Electromagnet ultrasonic changer can excite a variety of in the duct
The supersonic guide-wave of type, wherein circumferential wave guide are high to axial crack susceptibility, are mainly used to detect axial flaw, in order to realize pipe
The scanning in road, it is also necessary to move axially transducer along pipeline, cause detection efficiency low, time-consuming and tedious process；Axially lead
Ripple is high to circumferential crack susceptibility, is mainly used to detect circumferential defect, and that conventional is axial symmetry T (0,1) and L (0,2) mode, but
It is that axial guided is not easy to detect axial flaw, once such defect can not be detected and repaired in time, it will to the safety of pipeline
Operation brings hidden danger, and the axial guided direction of propagation is single, can not adjust, not high to the detectability of defect of pipeline.
In the related art, supersonic guide-wave is produced in the oblique direction of natural gas line wall using electromagnet ultrasonic changer,
Arbitrarily oriented crack defect in duct wall is detected, wherein, including three transducer arrays, multiple transmitting transducers examine in pipeline
Survey and composition emission array is diagonally arranged on device, two ring-type receive transducer arrays are arranged in emission array both sides.However, inspection
It is more using transducer number to survey device, and inside pipeline, is suitable only for the known and accessible feelings of pipe end
Condition, and such a method not only needs pipeline stopping production detection, and need to use other method to promote detector to be climbed in pipeline
Row completes detection, causes cost higher, time-consuming longer, has to be solved.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.
Therefore, it is an object of the invention to propose that a kind of whole directive property Corkscrews of double array adjustables of guided wave tomography are blue
Nurse wave transducer, accurately detects defect of pipeline, greatly improves the detectability to defect of pipeline, improves the security of pipeline, into
This is relatively low and simple and convenient, guided wave direction produced by easily changing, and goes for the metallic conduit of arbitrary shape defect
Tomography, the applicability of transducer is improved, effectively improve flexibility and the reliability of transducer.
To reach above-mentioned purpose, the embodiment of the present invention proposes a kind of whole directive property of double array adjustables of guided wave tomography
Corkscrews Lamb wave transducer, including：Ring-shaped emission transducer array and circumferential receptacle transducer array, the ring-shaped emission change
Energy device array and circumferential receptacle transducer array are arranged along pipe circumference direction, are respectively used to launch and are received Corkscrews orchid nurse
Ripple, wherein, the ring-shaped emission transducer array and the circumferential receptacle transducer array are respectively provided with least one transducer list
Member, each transducer unit include：Permanent magnet；Tortuous coil, circular hole is provided with a diagonal of the tortuous coil, with
It is connected by non-magnetic toroid with other coils with an array；Toroid, the toroid is provided with buckle, to fix
Position of the tortuous coil on the toroid is stated, and the tortuous coil can follow the toroidal movement and revolve
Turn, wherein, the toroid is along the circumferential direction surrounded on the outer wall of the pipeline, and is in straight condition, and can be around described
Pipeline is circumferentially mobile and moves axially.
The whole directive property Corkscrews Lamb wave transducer of double array adjustables of the guided wave tomography of the embodiment of the present invention, can be with
It is respectively used to launch by ring-shaped emission transducer array and circumferential receptacle transducer array and receives Corkscrews Lamb wave, and
The outer wall arrangement toroid of pipeline is along the circumferential direction surrounded on, so as to move annular transmitting transducer arrays and ring by toroid
Shape receive transducer array, transducer can flexibly move along pipeline when realizing detection, so as to accurately detect defect of pipeline, significantly
The detectability to defect of pipeline is improved, improves the security of pipeline, cost is relatively low, and simple and convenient, produced by easily changing
Guided wave direction, and go for the metallic conduit tomography of arbitrary shape defect, the applicability of transducer is improved, effectively
Improve flexibility and the reliability of transducer.
In addition, the whole directive property Corkscrews orchid nurse of double array adjustables of guided wave tomography according to the above embodiment of the present invention
Wave transducer can also have following additional technical characteristic：
Further, in one embodiment of the invention, the permanent magnet can be cylindrical type permanent magnet.
Further, in one embodiment of the invention, the diameter of the permanent magnet is more than the length of the tortuous coil
Degree and width, and magnetostatic field induction is not less than 0.1T.
Further, in one embodiment of the invention, the distance between adjacent windings center in the tortuous coil
Meet d=λ/2, wherein λ is the wavelength under respective frequencies f on dispersion curve.
Further, in one embodiment of the invention, the tortuous coil can use flexible printed circuit board system
Make.
Further, in one embodiment of the invention, two surfaces of the tortuous coil can scribble insulation
Layer.
Further, in one embodiment of the invention, the thickness of the insulating barrier can be 0.01~0.1mm.
Further, in one embodiment of the invention, the tortuous coil of the ring-shaped emission transducer array is led
Line initiating terminal can be connected to pulse power amplifier.
Further, in one embodiment of the invention, the tortuous coil of the circumferential receptacle transducer array is led
Line initiating terminal can be connected to filtering and amplifying circuit.
Further, in one embodiment of the invention, the ring-shaped emission transducer array and the circumferential receptacle
Axial spacing between transducer array can be 0.5~20m.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the whole directive property Corkscrews orchid nurse of double array adjustables according to the guided wave tomography of one embodiment of the invention
The structural representation of wave transducer；
Fig. 2 is the structural representation according to the transducer unit of one embodiment of the invention；
Fig. 3 is the structural representation according to the adjustment array transducer of one embodiment of the invention；
Fig. 4 is to be equivalent to propagate in flat board according to the adjustable directive property Corkscrews Lamb wave of one embodiment of the invention
Schematic diagram.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The whole sensing of double array adjustables of guided wave tomography proposed according to embodiments of the present invention is described with reference to the accompanying drawings
Property Corkscrews Lamb wave transducer.
Fig. 1 is that the whole directive property Corkscrews Lamb wave of double array adjustables of the guided wave tomography of one embodiment of the invention changes
The structural representation of energy device.
As shown in figure 1, the whole directive property Corkscrews Lamb wave transducer 10 of double array adjustables of the guided wave tomography includes：
Ring-shaped emission transducer array 1, circumferential receptacle transducer array 2 and toroid 3.
Wherein, ring-shaped emission transducer array 1, circumferential receptacle transducer array 2 are distinguished along the circumferential directions of pipeline 20
For launching and receiving Corkscrews Lamb wave, wherein, ring-shaped emission transducer array 1 and circumferential receptacle transducer array 2 have
There are at least one transducer unit (as shown in transducer unit 101 in figure and transducer unit 201), each transducer unit bag
Include：Permanent magnet；Circular hole is provided with one diagonal of tortuous coil, with by non-magnetic toroid 3 and with an array
Other coils are connected；Toroid 3 is provided with buckle, and with position of the tortuous coil of fixation on toroid 3, and tortuous coil can follow
Toroid 3 is moved and rotated, wherein, toroid 3 is along the circumferential direction surrounded on the outer wall of pipeline, and is in and stretches shape
State, and can and axial movement circumferential mobile around 3 pipeline of pipeline 20.The transducer 10 of the embodiment of the present invention can pass through annular
Line moves annular transmitting transducer arrays and circumferential receptacle transducer array, and transducer can flexibly move along pipeline when realizing detection
It is dynamic, so as to accurately detect defect of pipeline, greatly improve the detectability to defect of pipeline, improve the security of pipeline, cost compared with
It is low and simple and convenient, guided wave direction produced by easily changing, and go for the metallic conduit chromatography of arbitrary shape defect
Imaging, the applicability of transducer is improved, effectively improve flexibility and the reliability of transducer.
It is understood that two annular transducings of the transducer 10 of the embodiment of the present invention along the circumferential directions of pipeline 20
Device array, respectively ring-shaped emission transducer array 1 and circumferential receptacle transducer array 2.In an embodiment of the present invention, pipeline
20 overall diameters can be 60mm, and the axial spacing between ring-shaped emission transducer array 1 and circumferential receptacle transducer array 2 can be with
For 10m, the circumferencial direction of pipeline 20 can arrange four transducer units as an array, as shown in Fig. 2 each transducer list
Member includes permanent magnet 5 and tortuous coil 6.Wherein, circular hole is provided with a diagonal of tortuous coil 6, can be led by non-
Magnetic annular line 3 is connected with the coil of other transducer units, and toroid 3 has buckle 7, to fixed coil in toroid 3
On position, and buckle 7 can move on toroid 3.As shown in figure 3, toroid 3 is in straight condition, coil can follow ring
Shape line 3 is moved and rotated, so as to adjust produce Corkscrews Lamb wave angle, and the directionality of tortuous type coil compared with
It is good, and then the requirement of adjustable directional transducer can be realized, improve the reliability of transducer of the embodiment of the present invention.
For example, transducer unit can be arranged along the helix of pipeline 20, and be parallel to each other, and excite class Lamb wave edge
Helix is propagated forward.As shown in figure 4, by taking transducer unit 101 as an example, the embodiment of the present invention is by pipeline 20 along a bus exhibition
Tiling is opened, obtains flat board, because spiral path may be all around pipeline more than 20, it is believed that path passes flat board border, reaches
The virtual transducer infinitely extended along both sides.It should be noted that class Lamb wave can be passed through among pipeline 20 at a certain angle
Region, by being extracted to the guided wave received, so as to obtain the health status of pipeline 20, and class Lamb wave angle can
It is adjusted, the defects of so as to adapt to arbitrary shape, and then effectively improves flexibility and the reliability of transducer.
Alternatively, in one embodiment of the invention, permanent magnet 5 can be cylindrical type permanent magnet.
Further, in one embodiment of the invention, the diameter of permanent magnet 5 is more than the length and width of tortuous coil 6
Degree, and magnetostatic field induction is not less than 0.1T.
It should be noted that permanent magnet 5 can be cylindrical type permanent magnet, or the permanent magnet of other shapes, ability
The technical staff in domain can be configured according to actual conditions, be not particularly limited herein.
Further, in one embodiment of the invention, the distance between adjacent windings center meets in tortuous coil 6
D=λ/2, wherein λ are the wavelength under respective frequencies f on dispersion curve.
For example, λ is the wavelength under respective frequencies f on guided wave modal dispersion curve to be excited.Wherein, dispersion curve
The relation between velocity of wave and the thick product (i.e. the product of guided wave frequency and pipe thickness) of frequency is reacted, the embodiment of the present invention is by the edge of pipeline 20
Bus deploys, and obtains flat board, and in the case of the radius of pipeline 20 is larger, thickness is less, the guided wave in pipeline 20 can analogize to
Guided wave in flat board, the velocity of wave difference of Corkscrews Lamb wave and flat board Lamb wave can be neglected, and try to achieve the frequency of corresponding flat plates
After non-dramatic song line, according to exciting current frequency, so as to obtain wavelength X=cp/f.To excite class S0 moulds in the pipeline 20 of 2mm wall thickness
Exemplified by state, the material of pipeline 20 is steel, when selecting 0.5MHzmm operating points, working frequency 0.25MHz, in 0.5MHzmm
When, it is 5311.07m/s to obtain class S0 mode phase velocity by dispersion curve, so as to obtain wavelengthEnter
And the tortuous adjacent windings center spacing of coil 6 is 10.622mm.
Alternatively, in one embodiment of the invention, tortuous coil 6 can use flexible printed circuit board to make.
It is understood that the tortuous coil 6 in transducer unit can use flexible printed circuit board to make, so as to
To cause meander line circle 6 to be more closely bonded pipeline 20, and then flexibly transducer can be adjusted according to actual conditions,
It is effectively applicable to the metallic conduit tomography of arbitrary shape defect.
Further, in one embodiment of the invention, two surfaces of tortuous coil 6 can scribble insulating barrier.
Alternatively, in one embodiment of the invention, the thickness of insulating barrier can be 0.01~0.1mm.
Specifically, two surfaces of the tortuous coil 6 of the embodiment of the present invention scribble insulating barrier, so as to reach and gold
The purpose that metal conduit 20 insulate, the embodiment of the present invention can be used as an inflection week using adjacent two wires in tortuous coil 6
Phase, tortuous coil 6 include 2~5 inflection cycles, for example, in an embodiment of the present invention, tortuous coil 6 can include 3 and return
Roll over the cycle.It should be noted that the quantity in the inflection cycle included in tortuous coil 6, those skilled in the art can bases
Actual conditions are configured, and are not particularly limited herein.
Further, in one embodiment of the invention, the wire of the tortuous coil 6 of ring-shaped emission transducer array rises
Top can be connected to pulse power amplifier.
It is understood that the initiating terminal of the wire of tortuous coil 6 of transmitting transducer is connected to pulse power amplifier, from
And the string of burst pulse in short-term of 5~10 cycle sinusoidal waveforms is produced in coil, for example, pulse power amplifier output swashs
It is the sinusoidal waveform modulated by Hanning window to encourage waveform, can include 6 cycles.
Further, in one embodiment of the invention, the wire of the tortuous coil 5 of circumferential receptacle transducer array rises
Top can be connected to filtering and amplifying circuit.
It is understood that connect data collecting card after filter amplification circuit, the capture card of the embodiment of the present invention is by number
According to being transferred on computer, so as to carry out later data processing.
Alternatively, in one embodiment of the invention, ring-shaped emission transducer array 1 and circumferential receptacle transducer array
Axial spacing between 2 can be 0.5~20m.
Specifically, for the transducer 10 of the embodiment of the present invention when exciting Corkscrews Lamb wave, tortuous coil 6 is connected with excitation
Electric current, vortex is generated in steel pipe skin depth, vortex direction is vertical with static magnetic field, is acted on, causes by Lorentz force
The dither of particle, so as to inspire supersonic guide-wave.
The whole directive property Corkscrews Lamb wave of double array adjustables of the guided wave tomography proposed according to embodiments of the present invention changes
Can device, by ring-shaped emission transducer array and circumferential receptacle transducer array can be respectively used to launch and to receive Corkscrews blue
Nurse ripple, and the outer wall arrangement toroid of pipeline is along the circumferential direction surrounded on, so as to move ring-shaped emission transducing by toroid
Device array and circumferential receptacle transducer array, transducer can flexibly move along pipeline when realizing detection, so as to accurate detection pipe
Road defect, the detectability to defect of pipeline is greatly improved, improve the security of pipeline, cost is relatively low, and simple and convenient, easily
Guided wave direction produced by change, and go for the metallic conduit tomography of arbitrary shape defect, improve transducer
Applicability, effectively improve flexibility and the reliability of transducer.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include multiple this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three etc.,
Unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained in the multiple embodiments or example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be at any one
Or combined in an appropriate manner in multiple embodiments or example.In addition, in the case of not conflicting, those skilled in the art
Member different the embodiments or example and the feature of different embodiments or example described in this specification can be combined and
Combination.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (10)
- A kind of 1. whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography, it is characterised in that including：Ring-shaped emission transducer array and circumferential receptacle transducer array, the ring-shaped emission transducer array and circumferential receptacle change Energy device array is arranged along pipe circumference direction, is respectively used to launch and is received Corkscrews Lamb wave, wherein, the ring-shaped emission changes Energy device array and the circumferential receptacle transducer array are respectively provided with least one transducer unit, and each transducer unit includes：Permanent magnet；Tortuous coil, be provided with circular hole at a diagonal of the tortuous coil, with pass through non-magnetic toroid and with Other coils of array are connected；Toroid, the toroid are provided with buckle, with position of the fixation tortuous coil on the toroid, and the song Broken line circle can follow the toroidal movement and rotate, wherein, the toroid is along the circumferential direction surrounded on the pipe The outer wall in road, and straight condition is in, and can and axial movement circumferentially mobile around the pipeline.
- 2. the whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography according to claim 1, Characterized in that, the permanent magnet is cylindrical type permanent magnet.
- 3. the whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography according to claim 2, Characterized in that, the diameter of the permanent magnet is more than the length and width of the tortuous coil, and magnetostatic field induction is not Less than 0.1T.
- 4. the whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography according to claim 1, Characterized in that, the distance between adjacent windings center meets d=λ/2 in the tortuous coil, wherein λ is right on dispersion curve Answer the wavelength under frequency f.
- 5. the whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography according to claim 1, Characterized in that, the tortuous coil is made using flexible printed circuit board.
- 6. the whole directive property Corkscrews Lamb wave transducing of double array adjustables of guided wave tomography according to claim 1 or 5 Device, it is characterised in that two surfaces of the tortuous coil scribble insulating barrier.
- 7. the whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography according to claim 6, Characterized in that, the thickness of the insulating barrier is 0.01~0.1mm.
- 8. the whole directive property Corkscrews Lamb wave transducer of double array adjustables of guided wave tomography according to claim 1, Characterized in that, the wire initiating terminal of the tortuous coil of the ring-shaped emission transducer array is connected to pulse power amplifier.
- 9. the whole directive property Corkscrews Lamb wave transducing of double array adjustables of the guided wave tomography according to claim 1 or 8 Device, it is characterised in that the wire initiating terminal of the tortuous coil of the circumferential receptacle transducer array is connected to filtering and amplifying circuit.
- 10. the whole directive property Corkscrews orchid nurse of double array adjustables of the guided wave tomography according to claim any one of 1-9 Wave transducer, it is characterised in that the axial direction between the ring-shaped emission transducer array and the circumferential receptacle transducer array Spacing is 0.5~20m.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113661391A (en) * | 2019-04-05 | 2021-11-16 | 导向超声波有限公司 | Ultrasonic sensor for guided wave test |
| CN113777168A (en) * | 2021-09-14 | 2021-12-10 | 福州大学 | Magnetostrictive patch type sensor for efficiently exciting spiral circumferential lamb waves and working method thereof |
| CN115201338A (en) * | 2022-06-28 | 2022-10-18 | 西安电子科技大学 | Pipeline health condition monitoring system |
| CN116237321A (en) * | 2023-03-15 | 2023-06-09 | 清华大学深圳国际研究生院 | Flexible pipeline robot |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113661391A (en) * | 2019-04-05 | 2021-11-16 | 导向超声波有限公司 | Ultrasonic sensor for guided wave test |
| CN113777168A (en) * | 2021-09-14 | 2021-12-10 | 福州大学 | Magnetostrictive patch type sensor for efficiently exciting spiral circumferential lamb waves and working method thereof |
| CN115201338A (en) * | 2022-06-28 | 2022-10-18 | 西安电子科技大学 | Pipeline health condition monitoring system |
| CN116237321A (en) * | 2023-03-15 | 2023-06-09 | 清华大学深圳国际研究生院 | Flexible pipeline robot |
| CN116237321B (en) * | 2023-03-15 | 2023-10-17 | 清华大学深圳国际研究生院 | Flexible pipeline robot |
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| CN107817292B (en) | 2019-07-26 |
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