CN102645490A - Frequency-adjustable longitudinal modal magnetostriction sensor - Google Patents
Frequency-adjustable longitudinal modal magnetostriction sensor Download PDFInfo
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- CN102645490A CN102645490A CN2012101153541A CN201210115354A CN102645490A CN 102645490 A CN102645490 A CN 102645490A CN 2012101153541 A CN2012101153541 A CN 2012101153541A CN 201210115354 A CN201210115354 A CN 201210115354A CN 102645490 A CN102645490 A CN 102645490A
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Abstract
The invention discloses a frequency-adjustable longitudinal modal magnetostriction sensor. The sensor comprises a permanent magnet magnetic circuit, a flexible printing excitation coil, a flexible printing induction coil, a connector and the like; and a longitudinal modal ultrasonic guided wave can be excited in a cylindrical ferromagnetic waveguide for defect detection. The flexible printing excitation coil can adjust the overall-bias magnetic field intensity based on the bias magnetic field provided by the permanent magnet magnetic circuit, so that the waveguide material reaches the best magnetization state; the flexible printing induction coil can be curled into a cylinder, is mounted on the surface of a steel rod or steel rope after being connected and tightened through the connector, and excites and receives the longitudinal modal ultrasonic guided wave; and by changing the connection mode of the coil ends in the flexible printing induction coil, the frequency characteristic parameter of the sensor can be changed to realize the adjustment of the center frequency, thereby expanding the range of the working band of the single longitudinal modal magnetostriction sensor.
Description
Technical field
The present invention is the adjustable longitudinal mode magneto strictive sensor of centre frequency, belongs to the electromagnetic acoustic sensor technical field, is fit to be installed in the column type ferrimagnet waveguides such as steel pole, cable wire.
Background technology
Magneto strictive sensor need select to use the sensor of different frequency according to the actual detected condition: when requiring to detect distance, generally select the low frequency sensor when defects detection is carried out in waveguides such as steel pole, cable wire; When requiring accuracy of detection high, generally select high frequency sensors.When single-sensor only possesses single centre frequency,, need to make a plurality of sensors, and when detecting, need repeatedly change with different center frequency if when need using different frequency bands that same waveguide is detected.In addition, when sensor used fixing permanent magnet magnetic circuit, if tested waveguide material and size change, material was difficult to keep best magnetized state.Therefore, need centre of development frequency adjustable, quiescent biasing magnetic field is adjustable monomer sensor, adapt to the requirement of actual detected.
Summary of the invention
The objective of the invention is to realize the adjustable monomer longitudinal mode of a kind of centre frequency magneto strictive sensor; Make it can in column type ferrimagnet waveguides such as steel pole and cable wire, motivate the longitudinal mode supersonic guide-wave; And can control the quiescent biasing magnetic field intensity that this sensor provides; To adapt to the variation of waveguide material and size, guarantee that material is in best magnetized state.
For realizing above-mentioned purpose, the present invention adopts following technical scheme.The longitudinal mode magneto strictive sensor of frequency adjustable comprises permanent magnet magnetic circuit and a slice flexible printing field coil 4 and a slice flexible printing inductive coil of being made up of semicircle iron hoop 1, yoke 3, permanent magnet 7 and saddle sheet 85.The circular hole internal diameter that semicircle iron hoop 1 forms is greater than column type ferrimagnet waveguide 2 external diameters.Two yokes 3 are positioned at the both sides of column type ferrimagnet waveguide 2, are parallel to the axis direction of column type ferrimagnet waveguide 2.The two ends of yoke 3 overlap on the annulus of being made up of two semicircle iron hoops 1 through permanent magnet 7, saddle sheet 8 respectively; The two ends frame of column type ferrimagnet waveguide 2 is on the above-mentioned annulus of being made up of semicircle iron hoop 1; Yoke 3, permanent magnet 7, semicircle iron hoop 1 and saddle sheet 8 form monolateral magnetic circuit; Flexible printing field coil 4 curls once with flexible printing inductive coil 5 after be installed in the column type ferrimagnet waveguide 2 after fastening locking with the connector 6 of welding separately; Flexible printing field coil 4 and flexible printing inductive coil 5 retainer shafts are to the geometric center position consistency, and the axial length of flexible printing field coil 4 is greater than the axial length of flexible printing inductive coil 5 more than 2 times; Flexible printing field coil 4 is positioned at the outside of flexible printing inductive coil 5,
Flexible printing inductive coil 5 is printed with the consistent copper coil 9 of 2N section wiring, fasten locking through connector 6 after, flexible printing inductive coil 5 forms the coaxial solenoid coil of 2N sections and the waveguide of column type ferrimagnet 2.Every section solenoid comprises two connectivity ports 11, altogether 4N interface printing and being arranged on the flexible base, board 10, and wherein N is a natural number.
Through 4N interface carried out different connection modes; Can realize forming the forward and reverse alternately equidistant solenoid of coiling of n section to the 2N section is solenoidal around to controlling, final realization is to the control of center sensor frequency; The natural number of n for being divided exactly by 2N wherein, N is a natural number.
The permanent magnet magnetic circuit mainly offers quiescent biasing magnetic field and is used for the magnetization to column type ferrimagnet waveguide 2; When the material of column type ferrimagnet waveguide 2 and size change; Best quiescent biasing magnetic field intensity is different; Therefore need intensity to actual detected condition adjustment quiescent biasing magnetic field; Design the flexible printing field coil, control wherein feeds the size and Orientation of direct current for this reason, can on the basis, quiescent biasing magnetic field that the permanent magnet magnetic circuit forms, increase or reduce the intensity of bias magnetic field.
The even number section that described flexible inductive coil the comprises solenoid coil of coiling in the same way can be divided into the coil groups at isometric interval; The natural number of coil groups number for being divided exactly by the flexible line of induction number of turns; Comprise flexible printing coil hop count=total flexible printing inductive coil hop count in the coil groups number * every group; To the connected mode of the connectivity port of flexible inductive coil hop count, regulate the frequecy characteristic parameter of flexible inductive coil through all 2 times of adjustment flexible coil with this.The coiling in the same way of every group of coil inside can be realized at flexible base, board 10 1 ends in the connectivity port, positive and negative alternate coiling successively between coil groups.
The present invention can obtain following beneficial effect:
The present invention adopts above technical scheme; Make the flexible longitudinal mode magneto strictive sensor of monomer can realize the adjusting of centre frequency; The working band unit of expansion monomer magnetostrictive sensor; And change and the required quiescent biasing magnetic field intensity of the best magnetization of change in size adjusting to tested waveguide material, so that sensor performance is best.
Description of drawings
Fig. 1 integral installation sketch of the present invention;
Fig. 2 flexible printing inductive coil synoptic diagram;
Flexible printing inductive coil port connected mode when Fig. 3 frequecy characteristic parameter is L;
Flexible printing inductive coil port connected mode when Fig. 4 frequecy characteristic parameter is L/2;
Flexible printing inductive coil port connected mode when Fig. 5 frequecy characteristic parameter is L/n;
Fig. 6 diameter is the wavelength-frequency dispersion curve of L in the 6.3mm steel pole (0,1) mode;
When Fig. 7 monomer sensor works in centre frequency 64KHz, be the experimental signal in the 6.3mm steel pole at diameter;
Centre frequency during Fig. 8 characteristic parameter D=40mm;
When Fig. 9 monomer sensor works in the 130KHz centre frequency, be the experimental signal in the 6.3mm steel pole at diameter;
Centre frequency during Figure 10 characteristic parameter D=20mm;
When Figure 11 monomer sensor works in the 240KHz centre frequency, be the experimental signal in the 6.3mm steel pole at diameter;
Centre frequency during Figure 12 characteristic parameter D=10mm.
Among the figure: 1, semicircle iron hoop, 2, the waveguide of column type ferromagnetic material, 3, yoke, 4, the flexible printing drive coil, 5, the flexible printing inductive coil, 6, connector, 7, permanent magnet, 8, the saddle sheet, 9, copper coil, 10, flexible base, board, 11, the connectivity port.
Embodiment
Do further explanation below in conjunction with accompanying drawing and embodiment for the present invention:
Longitudinal mode magneto strictive sensor like Fig. 1 frequency adjustable is made up of permanent magnet magnetic circuit, flexible printing field coil 4 and flexible printing inductive coil 5.The 2N that flexible printing inductive coil 5 comprises (N is a natural number) section, and flexible printing inductive coil 5 length greater than measured circle column type ferrimagnet waveguide axis to girth.The permanent magnet magnetic circuit closes the back through two half round iron latch closures and is installed in the column type ferrimagnet waveguide 2 with the noncontact mode, and separating two semicircle iron hoops can be with the permanent magnet magnetic circuit from column type ferrimagnet waveguide 2 dismounting; Flexible printing field coil 4 all has flexibility with flexible printing inductive coil 5; Can be curled into cylindric; Paste on column type ferrimagnet waveguide 2 surfaces;, connector is installed in the column type ferrimagnet waveguide 2 after fastening, after the locking of releasing connector, and can be from dismounting in the waveguide 2 of column type ferrimagnet.Thus, the flexible longitudinal mode magneto strictive sensor of whole frequency adjustable all is convenient to dismounting, is suitable for actual engineering detecting.
The longitudinal mode magneto strictive sensor will be realized the control to centre frequency f; Must with axial length be 2N (N the is a natural number) section that comprises of the flexible printing inductive coil 5 of L in the same way the coiling solenoid be divided into n (natural number of n) and organize equally spaced coil for being divided exactly by 2N; In every group of coil; Each section coil still keeps coiling mode in the same way, but is necessary for the positive and negative alternate coiling between the two adjacent groups coil.
The axial length of every group of coil is L/n, is called frequecy characteristic parameter D (like Fig. 2), and when getting different value, the frequecy characteristic parameter D value of flexible printing inductive coil 5 is different as n (natural number of n for being divided exactly by 2N).Group as among Fig. 3 is counted n=1, and then its frequecy characteristic parameter is L; Group among Fig. 4 is counted n=2, and then its frequecy characteristic parameter is L/2; Group number among Fig. 5 is n, and then its frequecy characteristic parameter is L/n.
After the frequecy characteristic parameter D of flexible printing inductive coil 5 confirms; Through the wavelength (λ) of longitudinal mode in the waveguide 2 of calculating column type ferrimagnet and the dispersion curve of frequency (f); Make D=L/n=λ/2; Can confirm the frequency f that frequecy characteristic parameter D is corresponding, be called the centre frequency of flexible printing inductive coil 5 under frequecy characteristic parameter D control.
Be the function of checking monomer magnetostrictive sensor frequency adjustable, the employing axial length is 40mm, and the coil that is divided into the 2N=4 group makes an experiment.Coil division methods as stated, there is n=1 in correspondence, and n=2 and n=4 be totally three kinds of dividing mode.Adopt above-mentioned interface connecting method (Fig. 3,4,5), three kinds of corresponding frequecy characteristic parameters of mode are respectively D=40mm, D=20mm and D=10mm.Fig. 6 is the wavelength-frequency dispersion curve of L in the 6.3mm steel pole (0,1) mode for diameter, frequecy characteristic parameter D=40mm, and the centre frequency that D=20mm and D=10mm control respectively is about f=64kHz, f=130kHz and f=240kHz.
The coil frequency characteristic parameter is respectively D=40mm, and the monomer longitudinal mode magneto strictive sensor of D=20mm and D=10mm is 6.3mm at diameter, and is long for making an experiment successively in the steel pole of 2.0m.Monomer longitudinal mode magneto strictive sensor is installed on apart from 0.5m place, steel pole left part, has an axial length 2mm, the artificial grooving of degree of depth 2mm apart from 0.5m place, steel pole right part.Fig. 7,9 and 11 respective frequencies characteristic parameter respectively is D=40mm, the test signal when D=20mm and D=10mm.Select the right side echo among Fig. 7,9 and 11, calculate its spectrogram respectively, can find out that the frequecy characteristic parameter is D=40mm, when D=20mm and D=10mm, its frequency such as Fig. 8,10,12; The longitudinal mode magneto strictive sensor can work in f=64kHz, f=130kHz and f=240kHz, thus expanded the working band scope of monomer longitudinal mode magneto strictive sensor.
Flexible printing field coil that the longitudinal mode magneto strictive sensor of frequency adjustable comprises 4 is the solenoid coil of coiling in the same way; Feed direct current therein; Portion forms quiescent biasing magnetic field within it; And superimposed with the quiescent biasing magnetic field of permanent magnet magnetic circuit formation, column type ferrimagnet waveguide 2 is magnetized, when the corresponding material magnetostriction coefficient of magnetic field intensity is maximum; Reach best magnetized state, can promote magneto strictive sensor and in column type ferrimagnet waveguide 2, encourage and the ability that receives supersonic guide-wave.After column type ferrimagnet waveguide 2 changes in material and change in size, the quiescent biasing magnetic field intensity that best magnetized state is corresponding changes.When the direct current size and Orientation of control feeding flexible printing field coil 4, can realize control to the back quiescent biasing magnitude of field intensity that superposes, encourage and receive the performance of supersonic guide-wave to keep magneto strictive sensor.
Claims (2)
1. the longitudinal mode magneto strictive sensor of frequency adjustable includes permanent magnet magnetic circuit and a slice flexible printing field coil (4) and a slice flexible printing inductive coil (5) be made up of semicircle iron hoop (1), yoke (3), permanent magnet (7) and saddle sheet (8); It is characterized in that: two yokes (3) are positioned at the both sides of column type ferrimagnet waveguide (2), are parallel to the axis direction of column type ferrimagnet waveguide (2); The annulus outside that the two ends of yoke (3) are being made up of two semicircle iron hoops (1) through permanent magnet (7), saddle sheet (8) overlap joint respectively; The two ends frame of column type ferrimagnet waveguide (2) is in the said annulus of being made up of semicircle iron hoop (1); The said internal radius of being made up of semicircle iron hoop (1) is greater than column type ferrimagnet waveguide (2) external diameter; Yoke (3), permanent magnet (7), semicircle iron hoop (1) and saddle sheet (8) form monolateral magnetic circuit; Flexible printing field coil (4) and flexible printing inductive coil (5) curl once after be installed in the column type ferrimagnet waveguide (2) after fastening locking with the connector (6) of welding separately; Flexible printing field coil (4) and flexible printing inductive coil (5) retainer shaft be to the geometric center position consistency, and the axial length of flexible printing field coil (4) is greater than the axial length of flexible printing inductive coil (5) more than 2 times; Flexible printing field coil (4) is positioned at the outside of flexible printing inductive coil (5);
Flexible printing inductive coil (5) is printed with the consistent copper coil (9) of 2N section wiring, and after the locking of connector (6) fastening, flexible printing inductive coil (5) forms 2N section and the coaxial solenoid coil of column type ferrimagnet waveguide (2).Every section solenoid comprises two connectivity ports (11), altogether 4N interface printing and being arranged on the flexible base, board (10), and wherein N is a natural number.
2. the longitudinal mode magneto strictive sensor of frequency adjustable according to claim 1 is characterized in that: described column type ferrimagnet waveguide (2) is steel pole or cable wire.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529131A (en) * | 2013-10-18 | 2014-01-22 | 国家电网公司 | Adjustable magnetostrictive waveguide sensor |
| 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 |
| CN104483382A (en) * | 2014-11-20 | 2015-04-01 | 北京工业大学 | Longitudinal-mode magnetostrictive array sensor |
| CN104874538A (en) * | 2014-12-08 | 2015-09-02 | 北京工业大学 | Bending-mode magnetostriction sensor |
| CN105319274A (en) * | 2015-10-09 | 2016-02-10 | 中国石油化工股份有限公司 | Water cooler heat exchange tube torsional mode guided wave sensor |
| CN105548372A (en) * | 2015-12-09 | 2016-05-04 | 镇江天颐装备科技有限公司 | Pipeline guided-wave transducer based on giant magnetostrictive material, and manufacture and use method |
| CN105973995A (en) * | 2016-06-13 | 2016-09-28 | 华中科技大学 | Electromagnetic ultrasonic probe suitable for detecting round-section steel products and plates |
| CN107607623A (en) * | 2017-09-21 | 2018-01-19 | 北京中盈盘古智能技术有限公司 | Squirrel-cage magnetostriction longitudinal mode Guided waves sensor |
| CN109616276A (en) * | 2018-11-02 | 2019-04-12 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of unequal spacing solenoid |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529131A (en) * | 2013-10-18 | 2014-01-22 | 国家电网公司 | Adjustable magnetostrictive waveguide sensor |
| CN103529131B (en) * | 2013-10-18 | 2015-12-02 | 国家电网公司 | A kind of adjustable magnetostrictive waveguide sensor |
| CN104122329B (en) * | 2014-07-22 | 2016-06-01 | 华中科技大学 | Based on the detecting sensor of magnetic striction wave guide, detection system and application |
| 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 |
| CN104483382A (en) * | 2014-11-20 | 2015-04-01 | 北京工业大学 | Longitudinal-mode magnetostrictive array sensor |
| CN104483382B (en) * | 2014-11-20 | 2017-02-22 | 北京工业大学 | Longitudinal-mode magnetostrictive array sensor |
| CN104874538A (en) * | 2014-12-08 | 2015-09-02 | 北京工业大学 | Bending-mode magnetostriction sensor |
| CN104874538B (en) * | 2014-12-08 | 2017-05-24 | 北京工业大学 | Bending-mode magnetostriction sensor |
| CN105319274A (en) * | 2015-10-09 | 2016-02-10 | 中国石油化工股份有限公司 | Water cooler heat exchange tube torsional mode guided wave sensor |
| CN105548372A (en) * | 2015-12-09 | 2016-05-04 | 镇江天颐装备科技有限公司 | Pipeline guided-wave transducer based on giant magnetostrictive material, and manufacture and use method |
| CN105973995A (en) * | 2016-06-13 | 2016-09-28 | 华中科技大学 | Electromagnetic ultrasonic probe suitable for detecting round-section steel products and plates |
| CN107607623A (en) * | 2017-09-21 | 2018-01-19 | 北京中盈盘古智能技术有限公司 | Squirrel-cage magnetostriction longitudinal mode Guided waves sensor |
| CN107607623B (en) * | 2017-09-21 | 2020-11-24 | 北京中盈盘古智能技术有限公司 | Squirrel-cage magnetostrictive longitudinal mode guided wave detection sensor |
| CN109616276A (en) * | 2018-11-02 | 2019-04-12 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of unequal spacing solenoid |
| CN109616276B (en) * | 2018-11-02 | 2020-08-11 | 中国航空工业集团公司西安飞行自动控制研究所 | Unequal-spacing solenoid |
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Application publication date: 20120822 |