CN102721751A - Magnetostrictive guided wave receiving sensor - Google Patents
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- CN102721751A CN102721751A CN2012101680253A CN201210168025A CN102721751A CN 102721751 A CN102721751 A CN 102721751A CN 2012101680253 A CN2012101680253 A CN 2012101680253A CN 201210168025 A CN201210168025 A CN 201210168025A CN 102721751 A CN102721751 A CN 102721751A
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Abstract
本发明公开了一种磁致伸缩导波接收传感器；该接收传感器包括：结构相同、对称放置的两个传感模块；两个传感模块连接并形成开合结构；当两个传感模块闭合时形成空心圆柱体结构；每个传感模块包括：支架、线圈和插头；支架为凸台结构，凸台有N道等分槽使半圆环柱体等分成N+1个扇环柱体，线圈有N+1个，一个线圈沿着一个扇环柱体的外轮廓缠绕，每个线圈的两端连接插头；N为非负整数。使用本发明提供的磁致伸缩导波接收传感器可识别轴对称特征和非轴对称特征，实现焊缝等轴对称结构和非轴对称缺陷的识别，避免了将焊缝等轴对称结构误判为缺陷。此传感器对于纵向模态和扭转模态的磁致伸缩导波检测均可适用。
The invention discloses a magnetostrictive guided wave receiving sensor; the receiving sensor includes: two sensing modules with the same structure and placed symmetrically; the two sensing modules are connected to form an opening and closing structure; when the two sensing modules are closed A hollow cylinder structure is formed; each sensing module includes: a bracket, a coil and a plug; the bracket is a boss structure, and the boss has N equally divided grooves so that the semi-circular cylinder is equally divided into N+1 sector ring cylinders , there are N+1 coils, one coil is wound along the outer contour of a fan ring cylinder, and the two ends of each coil are connected to plugs; N is a non-negative integer. Using the magnetostrictive guided wave receiving sensor provided by the present invention can identify axisymmetric features and non-axisymmetric features, realize the identification of axisymmetric structures such as welds and non-axisymmetric defects, and avoid misjudgment of axisymmetric structures such as welds as defect. This sensor is suitable for magnetostrictive guided wave detection in both longitudinal and torsional modes.
Description
Technical field
The invention belongs to the Ultrasonic Nondestructive technical field, more specifically, relate to a kind of magnetic striction wave guide receiving sensor.
Background technology
Supersonic guide-wave has the advantage that the single-point excitation can realize long distance detecting, and the fast detecting, particularly long-distance transport pipes of microscler members such as pipeline, cable, rod iron, the fast detecting of city gas pipeline therefore are widely used.Magnetic striction wave guide detects based on magnetostrictive effect and counter magnetostriction effect excitation and receives guided wave signals, and its major advantage is the long distance detecting that the single-point excitation can realize member.In the existing patent " a kind of pipeline and steel pipe lossless detection method and equipment that utilizes magneto strictive sensor "; Stimulus sensor and receiving sensor to magnetic striction wave guide detects are introduced; It is characterized in that the coil two ends respectively comprise one and patch port; Two patch port couples together coil through connector, but forms the single magnetic test coil with opening-closing structure.Because the coil encircling in the receiving sensor forms similar solenoid structure on pipeline, therefore, receiving sensor " detected signal is the signal of whole circumference direction, " does not have circumferential resolving power.The main defective that exists is non-rotational symmetry characteristics defects such as etch pit, crackle in the pipeline; But various pipes generally comprises axially symmetric structures such as weld seam, flange; These rotational symmetry characteristics also will produce echoed signal; Because axially symmetric structure is different with the distribution of signal on the pipe circumference direction that nonaxisymmetric structure causes, utilize existing magnetic striction wave guide receiving sensor to cause the defective erroneous judgement easily through detection signal difference rotational symmetry and non-rotational symmetry characteristic.
Summary of the invention
To the defective of prior art, the object of the present invention is to provide a kind of magnetic striction wave guide receiving sensor that can discern rotational symmetry and non-symmetrical features structure.
For realizing above-mentioned purpose, the invention provides a kind of magnetic striction wave guide receiving sensor, comprising: two sensing modules that structure is identical, symmetry is placed; Said two sensing modules connect and the formation opening-closing structure; When said two sensing modules are closed, form the hollow cylinder body structure; Each sensing module comprises: support, coil and plug; Support is a boss structure, and boss has branch groove such as N road to make the semicircular ring cylinder be divided into N+1 fan ring cylinder, and coil has N+1, and coil twines the two ends attachment plug of each coil along the outline of a fan ring cylinder; N is a nonnegative integer.
Further, two sensing modules are connected with hasp through hinge or connect through two hasps.
Further, the width of said five equilibrium groove is greater than the twice of a coil thickness, and the degree of depth of said five equilibrium groove is greater than a coil width.
Further, said support is processed by insulating material.
Further, said coil is processed by enameled wire or flat cable.
Further, said sensing module also comprises: shell body and flexible liner; Shell body is connected with the base of support; Flexible liner is bonding through adhesive with shell body and support medial surface respectively; Plug is installed on the shell body.
Further, said flexible liner is processed by acoustic window materials such as polyurethane; Said shell body is processed by insulating material.
Another object of the present invention is to provide a kind of adopts above-mentioned receiving sensor to carry out the magnetic striction wave guide detection system that the pipeline longitudinal mode detects; Comprise: stimulus sensor, receiving sensor, guided wave detector and a plurality of magnetizing apparatus; In use; Be used to provide a plurality of magnetizing apparatuss of axial magnetic field to cooperate said stimulus sensor and said receiving sensor to be installed in pipeline to be checked respectively; Said stimulus sensor is connected with the excitation end of said guided wave detector, and said receiving sensor is connected with the receiving end of said guided wave detector; Said guided wave detector sends pulse signal and on pipeline, encourages the longitudinal mode guided wave signals through stimulus sensor; Said receiving sensor converts guided wave signals into electric signal and transfers to the guided wave detector handles the identification that rotational symmetry and nonaxisymmetric structure are realized in the back.
Another object of the present invention also is to provide a kind of above-mentioned receiving sensor to carry out the magnetic striction wave guide detection system that the pipeline torsion mode detects; Comprise: stimulus sensor, receiving sensor, guided wave detector and two strong magnetostriction bands; In use; Two strong magnetostriction bands cooperate said stimulus sensor and said receiving sensor to be installed on the pipeline to be checked respectively; Said stimulus sensor is connected with the excitation end of said guided wave detector, and said receiving sensor is connected with said guided wave detector receiving end; The pulse signal that said guided wave detector sends encourages the torsion mode guided wave signals through said stimulus sensor and is delivered on the said pipeline to be checked on a strong magnetostriction band; Guided wave signals is delivered on the said receiving sensor through another strong magnetostriction band, and said receiving sensor converts guided wave signals into electric signal and transfers to the guided wave detector handles the identification that rotational symmetry and nonaxisymmetric structure are realized in the back.
Further, described guided wave detector comprises: computing machine, pulse signal transmitter, power amplifier, signal preprocessor and A/D converter; The said pulse signal transmitter of said computer control produces pulse signal; Amplify through said power amplifier; Be transferred to said stimulus sensor from the excitation end of guided wave detector; The receiving end of guided wave detector receives the electric signal of said receiving sensor output; Said signal preprocessor carries out pre-service to said electric signal, and said A/D converter is a digital signal with pretreated electrical signal conversion, and said computing machine is handled the identification that realizes rotational symmetry and nonaxisymmetric structure to said digital signal.
The identification of axially symmetric structures such as magnetic striction wave guide receiving sensor provided by the invention can be discerned rotational symmetry characteristic and non-rotational symmetry characteristic, the realization weld seam and non-rotational symmetry defective, thus avoid the erroneous judgement of axially symmetric structures such as weld seam is defective; This sensor detects all applicable for the magnetic striction wave guide of longitudinal mode and torsion mode.
Description of drawings
The structural drawing of the magnetic striction wave guide receiving sensor that Fig. 1 provides for the embodiment of the invention;
The stereographic map of support and coil when the single sensing module that Fig. 2 provides for the embodiment of the invention such as does not have at the branch groove;
The cut-open view of 1 five equilibrium groove of single sensing module structure that Fig. 3 provides for the embodiment of the invention;
Fig. 4 a is installed in the synoptic diagram on the pipeline at the embodiment of the invention being used for of providing when the longitudinal mode guided wave detects;
Fig. 4 b is installed in the synoptic diagram on the pipeline at the embodiment of the invention being used for of providing when the torsion mode guided wave detects;
Fig. 5 is the structured flowchart of the magnetic striction wave guide detection system that uses the embodiment of the invention and provide;
The synoptic diagram that Fig. 6 tests on pipeline for the magnetic striction wave guide detection system that uses the embodiment of the invention to provide;
Fig. 7 is the experimentize signal waveforms of longitudinal mode in the detection signal that obtains of the magnetic striction wave guide receiving sensor that uses the embodiment of the invention to provide;
Fig. 8 is the experimentize signal waveforms of mode of flexural vibration in the detection signal that obtains of the magnetic striction wave guide receiving sensor that uses the embodiment of the invention to provide.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides a kind of magnetic striction wave guide receiving sensor that is used for pipe axis symmetry and non-symmetrical features identification; Overcome and utilized existing receiving sensor can't discern the deficiency of rotational symmetry and non-rotational symmetry characteristic; Realization is to the identification of the defective of structure such as weld seam with rotational symmetry characteristic and non-rotational symmetry characteristic, thereby avoids the defective erroneous judgement.
Fig. 1 shows the structure of the magnetic striction wave guide receiving sensor that the embodiment of the invention provides, by sensing module 1, and sensing module 2, hinge 3 and hasp 4 constitute. Sensing module 1,2 structures are identical, symmetry is placed, and are connected to form opening-closing structure through hinge and hasp, when two sensing modules are closed, form the hollow cylinder body structure, are convenient to be installed on the pipeline.
The two ends of coil 7 are connected with outside guided wave detector through plug 5, and coil 7 can be processed by enameled wire or flat cable; Plug 5 is installed on the shell body 6; Shell body 6 is connected with the base through screws of support 8, and shell body 6 and support 8 are processed by insulating material; Flexible liner 9 is bonding through adhesive with shell body 6 and support 8 lateral surfaces respectively; Flexible liner is processed by acoustic window materials such as polyurethane; In longitudinal mode detects; Flexible liner is only as the separation layer between coil 7 and the seized pipeline, and in torsion mode detected, flexible liner was paid somebody's debt and expected repayment later as the sound transparent layer between coil 7 and the seized pipeline.
The stereographic map of support and coil when Fig. 2 shows single sensing module and the branch groove such as do not have; Nothing waits the branch groove on the boss of support 8, and boss is 1 semicircular ring cylinder, and as the support frame of coil 7, coil 7 twines along semicircular ring ring cylinder outline; Whole receiving sensor comprises 2 coils.
Fig. 3 shows the cut-open view that single sensing module has 1 five equilibrium groove structure.Branch grooves such as 1 road are arranged on the boss of support 81, and boss is divided into 2 1/4 circle ring columns, and as the support frame of coil 7a, 7b, 1/4 circle ring column outline twines coil 7a along the left side respectively, and 1/4 circle ring column outline twines coil 7b along the right; Whole receiving sensor comprises 4 coils.
Fig. 4 a shows above-mentioned receiving sensor and is used for being installed in when the longitudinal mode guided wave detects the synoptic diagram on the pipeline.When pumping signal is longitudinal mode, receiving sensor is installed is used the magnetizing apparatus that axial magnetic field is provided, receiving sensor 11 is installed earlier on pipeline 10,, along circumference magnetizing apparatus 12 is installed evenly then the hasp fastening.
Fig. 4 b shows above-mentioned receiving sensor and is used for being installed in when the torsion mode guided wave detects the synoptic diagram on the pipeline.When pumping signal is torsion mode; Receiving sensor is installed is used strong magnetostriction band; Through bonding or mechanical system strong magnetostriction band 13 edges circumferentially are fixed on the pipeline 10 earlier, then receiving sensor 11 are installed on the strong magnetostriction band 13, and with hasp 4 fastenings.
Fig. 5 shows the structured flowchart that uses magnetic striction wave guide detection system of the present invention, and total system comprises pipeline 10, magnetic striction wave guide receiving sensor 11, stimulus sensor 14 and guided wave detector 15.Guided wave detector 15 comprises computing machine 16, pulse signal transmitter 17, power amplifier 18, signal preprocessor 19 and A/D converter 20.
Respectively receive signal through Computer Processing, extract the signal of vertical (or reversing) mode of rotational symmetry and non-axisymmetric bending mode, rotational symmetry is (or reversing) mode such as L (0 vertically; 1), L (0,2), T (0,1); Non-axisymmetric bending mode such as F (1,2), F (1,3) etc.For the rotational symmetry characteristic, contain rotational symmetry vertically (or reversing) mode and non-axisymmetric bending mode in the echoed signal, and for non-rotational symmetry characteristic, only there is vertically (or reversing) mode of rotational symmetry in echoed signal; Through the comparison of echoed signal under two kinds of mode, thereby realize rotational symmetry characteristic and non-rotational symmetry Feature Recognition.
The synoptic diagram that the receiving sensor that Fig. 6 shows the use embodiment of the invention to be provided experimentizes on pipeline, seized pipeline 10 is that a length 4m, internal diameter are that 32mm, external diameter are the steel pipe of 38mm, defective 21 is positioned at the 2.5m place apart from the left part in the steel pipe; Along circumferentially length is 20mm, wide weld seam 22 is positioned at the 3m place apart from the left part for 2mm, the degree of depth are 1mm, magnetostriction stimulus sensor 14 is a solenoid coil; Enameled wire by 1mm is processed, 1 layer of the number of plies, the number of turn 20 circles; Internal diameter 40mm is installed in the left part.The support and the shell body of magnetostriction receiving sensor 11 are processed by nylon material, and flexible liner is processed by polyurethane material, and the support convex platform such as does not partly have at the branch groove; Totally 2 of receiving coils are processed by the enameled wire of 1mm, 1 layer of the number of plies; The number of turn 20 circles, inner arc radius are 20mm, and outer arc radius is 60mm; Radian is 180 degree, and receiving sensor 11 is installed in the 2m place apart from the left part.At first the scheme of installation according to Fig. 4 a is installed in sensor and magnetizing apparatus on the pipeline; According to the system chart line of Fig. 5, in pipeline, encourage longitudinal mode guided wave L (0,2) again through existing guided wave detection system stimulus sensor; Receiving coil utilizes counter magnetostriction effect to convert ducted guided wave signals into electric signal; Be input to signal preprocessor, the electric signal input a/d converter behind pretreater converts digital signal into, imports computing machine then and handles.
The detection signal of two receiving coil receptions obtains the signal waveforms (Fig. 7) of rotational symmetry longitudinal mode L (0,2) and the signal waveforms (Fig. 8) of non-axisymmetric bending mode F (1,3) through processing.Signal comprises electromagnetic pulse M among Fig. 4
1, through signal S
1, the echoed signal F of defective 21
1, the echoed signal H of weld seam 22
1, the echoed signal S of right part
2Signal comprises electromagnetic pulse M among Fig. 5
2, the echoed signal F of defective 21
2
The echoed signal that from the signal of Fig. 7 and Fig. 8, can find out defective 21 (non-rotational symmetry characteristic) all has obvious amplitude under two kinds of mode; Echoed signal is compared during with rotational symmetry longitudinal mode L (0,2), non-axisymmetric bending mode F (1; 3) echoed signal delays in time that (F (1 the time; 3) velocity of propagation of signal is slower than the velocity of propagation of L (0,2) signal), and less on amplitude; And the echoed signal of weld seam 22 (rotational symmetry characteristic) only has amplitude under rotational symmetry longitudinal mode L (0,2), does not have the echoed signal of non-axisymmetric bending mode F (1,3), thereby can defective and weld seam be discerned.
The magnetostriction receiving sensor that the embodiment of the invention provides comprises two sensing modules, hinge and hasps; Two sensing module structures are identical, include support, shell body, flexible liner, coil and plug.This receiving sensor contains a plurality of coils; Through the reception signal of each coil of Computer Processing, obtain the signal of different modalities, relatively the signal amplitude of each mode; Can realize the identification of axially symmetric structure such as weld seam and non-rotational symmetry defective, thereby avoid the erroneous judgement of axially symmetric structures such as weld seam is defective.This sensor detects all applicable for the magnetic striction wave guide of longitudinal mode and torsion mode.
Those skilled in the art will readily understand; The above is merely preferred embodiment of the present invention; Not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a magnetic striction wave guide receiving sensor is characterized in that, comprising: two sensing modules that structure is identical, symmetry is placed;
Said two sensing modules connect and the formation opening-closing structure; When said two sensing modules are closed, form the hollow cylinder body structure;
Each sensing module comprises: support, coil and plug; Support is a boss structure, and boss has branch groove such as N road to make the semicircular ring cylinder be divided into N+1 fan ring cylinder, and coil has N+1, and coil twines the two ends attachment plug of each coil along the outline of a fan ring cylinder; N is a nonnegative integer.
2. magnetic striction wave guide receiving sensor as claimed in claim 1 is characterized in that: two sensing modules are connected with hasp through hinge or connect through two hasps.
3. magnetic striction wave guide receiving sensor as claimed in claim 1 is characterized in that: the width of said five equilibrium groove is greater than the twice of a coil thickness, and the degree of depth of said five equilibrium groove is greater than a coil width.
4. magnetic striction wave guide receiving sensor as claimed in claim 1 is characterized in that: said support is processed by insulating material.
5. magnetic striction wave guide receiving sensor as claimed in claim 1 is characterized in that: said coil is processed by enameled wire or flat cable.
6. magnetic striction wave guide receiving sensor as claimed in claim 1 is characterized in that: said sensing module also comprises: shell body and flexible liner; Shell body is connected with the base of support; Flexible liner is bonding through adhesive with shell body and support medial surface respectively; Plug is installed on the shell body.
7. magnetic striction wave guide receiving sensor as claimed in claim 6 is characterized in that: said flexible liner is processed by acoustic window materials such as polyurethane; Said shell body is processed by insulating material.
8. one kind is adopted the described receiving sensor of claim 1 to carry out the magnetic striction wave guide detection system that the pipeline longitudinal mode detects; It is characterized in that: comprising:
Stimulus sensor, receiving sensor, guided wave detector and a plurality of magnetizing apparatus;
In use; Be used to provide a plurality of magnetizing apparatuss of axial magnetic field to cooperate said stimulus sensor and said receiving sensor to be installed in pipeline to be checked respectively; Said stimulus sensor is connected with the excitation end of said guided wave detector, and said receiving sensor is connected with the receiving end of said guided wave detector; Said guided wave detector sends pulse signal and on pipeline, encourages the longitudinal mode guided wave signals through stimulus sensor; Said receiving sensor converts guided wave signals into electric signal and transfers to the guided wave detector handles the identification that rotational symmetry and nonaxisymmetric structure are realized in the back.
9. one kind is adopted the described receiving sensor of claim 1 to carry out the magnetic striction wave guide detection system that the pipeline torsion mode detects; It is characterized in that: comprising:
Stimulus sensor, receiving sensor, guided wave detector and two strong magnetostriction bands;
In use; Two strong magnetostriction bands cooperate said stimulus sensor and said receiving sensor to be installed on the pipeline to be checked respectively; Said stimulus sensor is connected with the excitation end of said guided wave detector, and said receiving sensor is connected with said guided wave detector receiving end; The pulse signal that said guided wave detector sends encourages the torsion mode guided wave signals through said stimulus sensor and is delivered on the said pipeline to be checked on a strong magnetostriction band; Guided wave signals is delivered on the said receiving sensor through another strong magnetostriction band, and said receiving sensor converts guided wave signals into electric signal and transfers to the guided wave detector handles the identification that rotational symmetry and nonaxisymmetric structure are realized in the back.
10. like claim 8 or 9 described magnetic striction wave guide detection systems, it is characterized in that: described guided wave detector comprises:
Computing machine, pulse signal transmitter, power amplifier, signal preprocessor and A/D converter;
The said pulse signal transmitter of said computer control produces pulse signal; Amplify through said power amplifier; Be transferred to said stimulus sensor from the excitation end of guided wave detector; The receiving end of guided wave detector receives the electric signal of said receiving sensor output; Said signal preprocessor carries out pre-service to said electric signal, and said A/D converter is a digital signal with pretreated electrical signal conversion, and said computing machine is handled the identification that realizes rotational symmetry and nonaxisymmetric structure to said digital signal.
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| CN104090034A (en) * | 2014-07-21 | 2014-10-08 | 哈尔滨工业大学 | Electromagnetic ultrasonic Lamb wave transducer for guided wave tomography |
| CN104122329A (en) * | 2014-07-22 | 2014-10-29 | 华中科技大学 | Detection sensor based on magnetostriction guide waves, detection system and application |
| CN104502443A (en) * | 2014-12-12 | 2015-04-08 | 北京工业大学 | Circular-array-type magnetostriction sensor based on orthogonal encircling coil |
| CN105842333A (en) * | 2015-01-12 | 2016-08-10 | 宝山钢铁股份有限公司 | Nondestructive testing method for pipeline in complicated equipment |
| CN106641734A (en) * | 2016-10-14 | 2017-05-10 | 清华大学 | Online high-temperature pipeline ultrasonic guided wave detection device based on L-shaped waveguide structure |
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| CN109187749A (en) * | 2018-09-27 | 2019-01-11 | 华中科技大学 | A kind of mode of flexural vibration guided wave sensor |
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| CN110703126A (en) * | 2019-10-23 | 2020-01-17 | 内蒙古电力（集团）有限责任公司内蒙古超高压供电局 | Intelligent overhead transmission line capable of realizing wire breakage monitoring |
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