CN103217359B - Torsional mode magnetostrictive sensor used for minor-diameter metal bar - Google Patents
Torsional mode magnetostrictive sensor used for minor-diameter metal bar Download PDFInfo
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- CN103217359B CN103217359B CN201310110266.7A CN201310110266A CN103217359B CN 103217359 B CN103217359 B CN 103217359B CN 201310110266 A CN201310110266 A CN 201310110266A CN 103217359 B CN103217359 B CN 103217359B
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- ferrocobalt
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Abstract
The invention discloses a torsional mode magnetostrictive sensor used for a minor-diameter metal bar and belongs to the technical field of electromagnetic acoustic sensors. The sensor comprises a ferrocobalt patch, a support sleeve, an inductive coil, a protective shell and a bayonet nut connector (BNC) interface. The ferrocobalt patch which is magnetized by a bias magnetic field is curled and sticked on the surface of the minor-diameter metal bar; and the clearance fit is kept between the minor-diameter metal bar and the support sleeve and the minor-diameter metal bar is inserted into the support sleeve to facilitate dismounting and mounting. An inductive coil is wound around the support sleeve. The support sleeve is embedded in the protective shell and is installed at the end part of the metal bar with the protective shell. The BNC interface which is fixedly arranged on the protective shell is connected with output and input ports of the inductive coil. The sensor disclosed by the invention can realize the stimulation and the reception of torsional mode ultrasonic guide waves in the minor-diameter metal straight bar and is used for the measurement of liquid viscosity coefficients.
Description
Technical field:
For the torsion mode magneto strictive sensor of minor diameter Metallic rod, belong to electromagnetic acoustic sensor technical field.
Background technology:
Current torsion mode supersonic guide-wave magneto strictive sensor is applied on some coarse scale structures such as pipeline, cable wire mostly, mainly carries out length and defects detection, but is all difficult to be less than in the Metallic rod of 10mm at diameter encourage torsion mode supersonic guide-wave.The material of minor diameter Metallic rod is also not quite similar, such as iron, copper, aluminium, nickel and all kinds of alloy material etc.Therefore, a kind of simple for structure, dismounting magneto strictive sensor easily of development is needed, for encouraging torsion mode supersonic guide-wave in minor diameter Metallic rod.
Summary of the invention:
The present invention seeks to the excitation realizing torsion mode supersonic guide-wave in minor diameter Metallic rod, and realize the measurement of coefficient of viscosity based on torsion mode supersonic guide-wave attenuation characteristic in a liquid.Meanwhile, this sensor can be easily installed in minor diameter Metallic rod and also remove from it.
For achieving the above object, the present invention takes following technical scheme:
Be L width by length be that the ferrocobalt paster of d is according to M=L/d, the span of M be 2 ~ 10 proportionate relationship self curling after be pasted on minor diameter Metallic rod surface by epoxide-resin glue, the span of the quantity N of ferrocobalt paster is 1 ~ 50, and N number of ferrocobalt paster is gapless is arranged in Metallic rod axially; Inductive coil is wound on stop sleeve; The minor diameter Metallic rod interpolation posting ferrocobalt paster is inserted stop sleeve and and keeps clearance fit relationship between stop sleeve.Bnc interface to be fixedly installed on protecting sheathing and to be connected with inductive coil input/output port, encourages Received signal strength with this.
The present invention adopts above technical scheme, makes this sensor can realize the torsion mode supersonic guide-wave excitation in minor diameter Metallic rod, and simple for structure, and be easy to dismounting, the coefficient of viscosity that can be used for different liquids is measured.
Accompanying drawing illustrates:
Fig. 1 inner structure sectional view of the present invention;
The arrangement schematic diagram of Fig. 2 ferrocobalt paster of the present invention in minor diameter Metallic rod;
Fig. 3 one-piece construction schematic diagram of the present invention;
Detection signal waveform in Fig. 4 minor diameter Metallic rod;
In figure: 1, minor diameter Metallic rod, 2, ferrocobalt paster, 3, stop sleeve, 4, inductive coil, 5, protecting sheathing, 6, bnc interface.
Embodiment:
As shown in Figure 1, the torsion mode magneto strictive sensor inner structure for minor diameter Metallic rod is made up of ferrocobalt paster 2, stop sleeve 3 and inductive coil 4 three part.Through between the magnetized ferrocobalt paster 2 of bias magnetic field and minor diameter Metallic rod 1 surface, filling epoxy resin glue is to paste.Inductive coil 4 is wound on stop sleeve 3; Be inserted in minor diameter Metallic rod 1 in stop sleeve 3, and keep clearance fit relationship with stop sleeve 3.
Figure 2 shows that ferrocobalt paster 2 is the arrangement schematic diagram in the minor diameter Metallic rod 1 of D at diameter, ferrocobalt paster 2, before the surface being pasted on minor diameter Metallic rod 1, need carry out prebuckling process, to form flexible annular structure.The length L of single hop ferrocobalt paster 2 equals the perimeter L=π × D of minor diameter Metallic rod 1; The length L of ferrocobalt paster 2 and the ratio of width d are the span of M=L/d, M is 2 ~ 10; General employing N number of ferrocobalt paster 2 gapless is arranged in minor diameter Metallic rod 1 axially, and the span of quantity N is 1 ~ 50.
Figure 3 shows that one-piece construction scheme of installation of the present invention; the external structure of sensor comprises protecting sheathing 5 and bnc interface 6 two parts; wherein protecting sheathing 5 is for the protection of sensor internal structure, and bnc interface 6, for being connected with inductive coil input/output port, realizes Signal transmissions.
An example is provided in conjunction with content of the present invention.
Fig. 4 is T (0,1) the mode ultrasonic guided wave signals waveform utilizing the present invention to receive in the minor diameter steel pole of long 600mm, diameter 4mm.Sensor excitation frequency is 128kHz, according to the T (0 that first time edge echo T1 calculates with the propagation distance difference △ l and propagation time difference △ t of second time edge echo T2,1) mode propagation speed is about 3255m/s, with the T (0 of theory calculate, 1) mode group velocity angle value Vg=3260m/s is close, proves that the present invention can encourage torsion mode supersonic guide-wave in minor diameter steel pole.
Claims (2)
1. for the torsion mode magneto strictive sensor of minor diameter Metallic rod, it is characterized in that: comprise ferrocobalt paster, stop sleeve, inductive coil, protecting sheathing and bnc interface; Ferrocobalt paster after bias magnetic field magnetization is curling is pasted on minor diameter Metallic rod surface; Keep clearance fit relationship between minor diameter Metallic rod and stop sleeve, and in be inserted in stop sleeve, be convenient to dismounting; Inductive coil is wound on stop sleeve; Stop sleeve is embedded in protecting sheathing, and is installed on metal rod ends together with protecting sheathing, and the bnc interface be fixedly installed on protecting sheathing is connected with inductive coil input/output port; Described ferrocobalt paster is rectangle, is pasted on minor diameter Metallic rod surface by epoxide-resin glue; The diameter of described minor diameter Metallic rod is D, the length L of ferrocobalt paster equals the girth of minor diameter Metallic rod; The length L of ferrocobalt paster and the ratio of width d are the span of M=L/d, M is 2 ~ 10; The diameter D scope of minor diameter Metallic rod is 1 ~ 10mm.
2. the torsion mode magneto strictive sensor for minor diameter Metallic rod according to claim 1, is characterized in that: the span of the quantity N of ferrocobalt paster is 1 ~ 50, and N number of ferrocobalt paster is gapless is arranged in Metallic rod axially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310110266.7A CN103217359B (en) | 2013-04-01 | 2013-04-01 | Torsional mode magnetostrictive sensor used for minor-diameter metal bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310110266.7A CN103217359B (en) | 2013-04-01 | 2013-04-01 | Torsional mode magnetostrictive sensor used for minor-diameter metal bar |
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| Publication Number | Publication Date |
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| CN103217359A CN103217359A (en) | 2013-07-24 |
| CN103217359B true CN103217359B (en) | 2015-06-03 |
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| CN201310110266.7A Active CN103217359B (en) | 2013-04-01 | 2013-04-01 | Torsional mode magnetostrictive sensor used for minor-diameter metal bar |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107422027B (en) * | 2017-09-05 | 2020-09-25 | 北京工业大学 | Torsional mode guided wave magnetostrictive sensor based on double-ring permanent magnet array |
| CN109870389A (en) * | 2019-04-12 | 2019-06-11 | 长春工程学院 | Based on magnetostrictive displacement sensor irrigation water coefficient of viscosity detection device and method |
| CN115469022B (en) * | 2022-10-18 | 2024-09-27 | 哈尔滨工业大学 | Unidirectional torsion guided wave single-channel magnetostrictive transducer and application method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202562456U (en) * | 2012-05-10 | 2012-11-28 | 北京工业大学 | Dry-coupling torsional-mode magnetostrictive transducer |
| CN102854090A (en) * | 2012-07-18 | 2013-01-02 | 北京工业大学 | Detection device and method of liquid viscosity coefficient based on ultrasonic guided wave |
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2013
- 2013-04-01 CN CN201310110266.7A patent/CN103217359B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202562456U (en) * | 2012-05-10 | 2012-11-28 | 北京工业大学 | Dry-coupling torsional-mode magnetostrictive transducer |
| CN102854090A (en) * | 2012-07-18 | 2013-01-02 | 北京工业大学 | Detection device and method of liquid viscosity coefficient based on ultrasonic guided wave |
Non-Patent Citations (2)
| Title |
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| 兆赫兹磁致伸缩超声导波管道检测系统的研制;刘秀成等;《失效分析与预防》;20130201;第8卷(第1期);全文 * |
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| CN103217359A (en) | 2013-07-24 |
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Effective date of registration: 20170522 Address after: 100022, room 4, building 2605, Wanda Plaza, No. 93, Jianguo Road, Chaoyang, Beijing Patentee after: Beijing Zhong Ying Pangu Intelligent Technology Co., Ltd. Address before: 100124 Chaoyang District, Beijing Ping Park, No. 100 Patentee before: Beijing University of Technology |
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