CN201072332Y - Magnetostrictive transducer used for detecting cable ultrasound guided wave - Google Patents
Magnetostrictive transducer used for detecting cable ultrasound guided wave Download PDFInfo
- Publication number
- CN201072332Y CN201072332Y CNU200720169811XU CN200720169811U CN201072332Y CN 201072332 Y CN201072332 Y CN 201072332Y CN U200720169811X U CNU200720169811X U CN U200720169811XU CN 200720169811 U CN200720169811 U CN 200720169811U CN 201072332 Y CN201072332 Y CN 201072332Y
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- Prior art keywords
- sensor
- solenoid
- end sensor
- strand wires
- guided wave
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- 238000002604 ultrasonography Methods 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 230000005284 excitation Effects 0.000 claims abstract description 17
- 230000005381 magnetic domain Effects 0.000 abstract description 11
- 238000005498 polishing Methods 0.000 abstract description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 13
- 230000002950 deficient Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000012467 final product Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The utility model relates to a magneto strictive sensor for detecting ultrasonic guided waves of a stranded steel wire, pertaining to the technical field of acoustic sensor. A biasing magnetic circuit that consists of a stranded steel wire (1), a clamping piece (2), a saddle (3), a permanent magnet (4) and a yoke (5) makes magnetic domain in the stranded steel wire turn in the direction of magnetic field in a biasing way. Excitation signal that is given off by a signal generator, after being amplified by a power amplifier, enters a first enamelled wire (7). An alternating magnetic field is produced on the stranded steel wire in a solenoid (6) in an excitation end sensor; matching between the biasing magnetic field and the alternating magnetic field makes magnetic domain in the stranded steel wire sway along the axial direction; the change of the magnetic domain is received by a solenoid in a receiving end sensor; a second enamelled wire (8) transfers the received signal into an oscillograph, which displays waveform received. The utility model has low cost, and detecting to ultrasonic guided waves can be carried out without polishing the stranded steel wire, thereby improving repeatability and operability of the detecting.
Description
Technical field
The utility model relates to a kind of magneto strictive sensor that steel stranded wire supersonic guided wave detects that is used for, belong to the acoustic sensor technical field, its effect is that the electromagnetic energy that sensor produces is converted to mechanical energy (acoustic energy) by steel strand wires, and comes prestress size, defective to steel strand wires to have or not etc. by the analysis to mechanical energy (acoustic energy) and detect.
Background technology
Now, the sensor that detects such as have or not mostly to be the piezoelectricity sheet type sensor for prestress size, the defective of steel strand wires.This kind sensor needs to polish the end face of steel strand wires quite smooth, smooth in use, and must use special anchor clamps that piezoelectric patches is fixed on end face after the polishing tightly.So brought a lot of inconvenience to actual detected, simultaneously because after each polishing, the verticality of end face and axis can't guarantee to be certain value, so detection is repeated relatively poor.
The utility model content
The purpose of this utility model is to provide a kind of magneto strictive sensor that steel stranded wire supersonic guided wave detects that is used for, it not only can be used for the linear measure longimetry of steel strand wires, can also be used for detection to peripheral defective of steel strand wires and prestress size, has the signal to noise ratio (S/N ratio) height, volume is little, characteristics such as propagation distance is far away, and good reproducibility can satisfy requirement of experiment preferably.
To achieve these goals, the utility model has been taked following technical scheme.Mainly include excitation end sensor and receiving end sensor.The excitation end sensor mainly includes saddle sheet 3, permanent magnet 4, yoke 5 and is enclosed within intermediate plate 2, the solenoid 6 of steel strand wires 1 outside surface, solenoid 6 is provided with step in appearance, part between per two steps all is surrounded with first enameled wire 7, whenever, just change once around direction through a step first enameled wire 7, the two ends of first enameled wire 7 link to each other with signal generator; The two ends of solenoid 6 are provided with intermediate plate 2, outside surface at intermediate plate 2 is with saddle sheet 3, the outside surface of saddle sheet 3 along the circumferential direction evenly is fixed with three permanent magnets 4, and yoke 5 is connected with the outer face that is positioned at two block permanent magnets 4 solenoid 6 two ends, on steel strand wires 1 same axis direction; The receiving end sensor is identical with excitation end sensor structure, and with excitation end sensor axially being arranged in juxtaposition along steel strand wires 1.
Described saddle sheet 3 is made up of the rectangular parallelepiped that three bottoms have 120 degree arc grooves, and arc radius is identical with the radius of steel strand wires 1.
The number of the step on described solenoid 6 outside surfaces is 4～6.
The diameter of first enameled wire 7 of described excitation end sensor is 0.2～0.4mm.
The diameter of second enameled wire 8 of described receiving end sensor is 0.1～0.2mm.
In the utility model, steel strand wires 1, intermediate plate 2, saddle sheet 3, permanent magnet 4 and yoke 5 have been formed a biasing magnetic circuit.The magnetic domain of steel strand wires 1 inside will deflect to a comparatively unified offset position along magnetic direction in the magnetic circuit.Then, after the signal that signal generator sends is amplified by power amplifier, enter enameled wire 7 through the output terminal of power amplifier.Afterwards, just can in the excitation end sensor, produce an alternating magnetic field on the steel strand wires in the solenoid 6, it is the center with the offset position that this alternating magnetic field can make magnetic domain, swings back and forth with the variation of alternating magnetic field, causes steel strand wires to produce vertically elongation and shortening on the macroscopic view.Wherein, alternating magnetic field can be regarded an alterante stress as, and this alterante stress can cause that the magnetic domain in the receiving end sensor changes, and the solenoid 6 that the variation of magnetic domain can be received in the end sensor receives.And received signal is imported oscillographic input end into by enameled wire 8, and shows the waveform that receives by oscillograph.The waveform that receives by analysis comes prestress size, the defective to steel strand wires to have or not etc. to detect.
Permanent magnet 4 in the utility model is made for the rare-earth Nd-Fe-B material.This material has advantages such as coercive force is big, and magnetic field intensity is strong, and this lays a good foundation for the stability that guarantees bias magnetic field.And excitation end of the present utility model and receiving end sensor can produce and receive the signal that signal to noise ratio (S/N ratio) is higher, mode is comparatively single under the alternating magnetic field that three magnetic circuit bias magnetic fields and solenoid provide.On the other hand,, the sensor of the utility model design gets final product, so it is convenient, real more to guarantee that more at every turn than the steel strand wires end face that all needs to polish piezoelectric patches is in contact with it sufficient mode because only need being sleeved on the steel strand wires.
Description of drawings
Fig. 1 is the utility model integral installation synoptic diagram;
Fig. 2 is the structural representation of the utility model intermediate plate 2;
Fig. 3 is the structural representation of the utility model saddle sheet 3;
Fig. 4 is the structural representation of the utility model permanent magnet 4;
Fig. 5 is the structural representation of the utility model yoke 5;
Fig. 6 is the structural representation of the utility model solenoid 6.
Among the figure: 1, steel strand wires, 2, intermediate plate, 3, the saddle sheet, 4, permanent magnet, 5, yoke, 6, solenoid, 7, enameled wire.
Embodiment
Be described in further detail below in conjunction with Fig. 1～6 pair present embodiment.
The technical scheme of the magnetostriction ultrasonic guided wave detecting sensor that present embodiment provides mainly comprises excitation end sensor and receiving end sensor two big technical schemes.Wherein encourage the structure of end sensor such as Fig. 1～shown in Figure 6, comprise intermediate plate 2, saddle sheet 3, permanent magnet 4, yoke 5 and solenoid 6, saddle sheet 3 is made up of the rectangular parallelepiped that three bottoms have 120 degree arc grooves, and arc radius is identical with the radius of steel strand wires 1, as shown in Figure 3.Solenoid 6 outside surfaces are provided with 4 steps, as shown in Figure 6.
To detect 7 core steel strand wires is example, solenoid 6 tightly is enclosed within on the steel strand wires 1 by central through hole 602,10 thin slices are stacked composition intermediate plate 2, be installed on the steel strand wires 1 by interior arch face 201, and the upper surface 202 of intermediate plate 2 tightly is attached on the left side 601 of solenoid 6.With diameter is that the groove 603 that passes on the step 604 of solenoid 6 of an end of 0.2 millimeter enameled wire 7 is deasil close on outside surface 605; When around when the step 606, again enameled wire 7 is passed groove 607 on the step 606 widdershins on outside surface 608; When around the time to step 609, again enameled wire 7 is passed groove 610 on the step 609 deasil on outside surface 611, enameled wire 7 is passed the groove 613 on the step 612, the length of the enameled wire of leaving and taking beyond the groove 603 and 613 7 only need guarantee that the output terminal of enough access power amplifiers gets final product again.3 saddle sheets 3 are distributed on the thickness face 203 of intermediate plate 2 by arch face 302.
The front end face 402 of left side 601, permanent magnet 4 of end face 303 and solenoid 6 of saddle sheet 3 that is positioned at solenoid 6 left ends is at same perpendicular, the front end face 404 of the right side of saddle sheet 3 and permanent magnet 4 and the front end face 301 of saddle sheet 3 are in same perpendicular, and the lower surface 302 of saddle sheet contacts with the lateral surface 203 of intermediate plate.Permanent magnet 4 is adsorbed on the upper surface 304 of saddle sheet 3 tightly by lower surface 403.All the other array intermediate plates 2, saddle sheet 3 also are installed in the right-hand member of solenoid 6 according to the method described above, and wherein, the right side 614 of solenoid 6 contacts with the front surface 202 of intermediate plate 2.Yoke 5 is attached together with the upper surface 401 of the permanent magnet 4 of the upper surface 401 of the permanent magnet 4 at solenoid 6 both ends and afterbody respectively tightly by lower surface 502, wherein, the front end face 404 of the left side 501 of yoke 5 and the permanent magnet 4 of solenoid 6 left ends is in same perpendicular, and the rear end face 40 of the right side 503 of yoke 5 and the permanent magnet 4 of solenoid 6 right-hand members is in same perpendicular.
The technical scheme of receiving end sensor is identical with the excitation end sensor, and just having selected diameter for use is that 0.12 millimeter enameled wire 8 is as the lead of receiving end.
Use principle is as follows:
In the present embodiment, steel strand wires 1, intermediate plate 2, saddle sheet 3, permanent magnet 4 and yoke 5 have been formed a biasing magnetic circuit.The magnetic domain of steel strand wires 1 inside will deflect to a comparatively unified offset position along magnetic direction in the magnetic circuit.Then, after the signal that signal generator sends is amplified by power amplifier, enter enameled wire 7 through the output terminal of power amplifier.Afterwards, just can in the excitation end sensor, produce an alternating magnetic field on the steel strand wires in the solenoid 6, it is the center with the offset position that this alternating magnetic field can make magnetic domain, swings back and forth with the variation of alternating magnetic field, causes steel strand wires to produce vertically elongation and shortening on the macroscopic view.Wherein, alternating magnetic field can be regarded an alterante stress as, and this alterante stress can cause that the magnetic domain in the receiving end sensor changes, and the solenoid 6 that the variation of magnetic domain can be received in the end sensor receives.And received signal is imported oscillographic input end into by enameled wire 8, and shows the waveform that receives by oscillograph.The waveform that receives by analysis comes prestress size, the defective to steel strand wires to have or not etc. to detect.
Present embodiment is not only with low cost, more makes the repeatability of detection and operability obtain effective lifting, simultaneously because it has adopted the correlation theory of guided wave, makes sensor obtain effective lifting in the ability that detects on the steel strand wires length.
Claims (5)
1. one kind is used for the magneto strictive sensor that steel stranded wire supersonic guided wave detects, it is characterized in that: mainly include excitation end sensor and receiving end sensor, the excitation end sensor mainly includes saddle sheet (3), permanent magnet (4), yoke (5) and be enclosed within the intermediate plate (2) of steel strand wires (1) outside surface, solenoid (6), apparent two ends of solenoid (6) and center section are provided with step, part between per two steps all is surrounded with first enameled wire (7), whenever, just change once around direction through step first enameled wire (7), the two ends of first enameled wire (7) link to each other with signal generator; The two ends of solenoid (6) are provided with intermediate plate (2), outside surface at intermediate plate (2) is with saddle sheet (3), the outside surface of saddle sheet (3) along the circumferential direction evenly is fixed with three permanent magnets (4), and yoke (5) is connected with the outer face that is positioned at two block permanent magnets (4) solenoid (6) two ends, on the same axis direction of steel strand wires (1); The receiving end sensor is identical with excitation end sensor structure, and with excitation end sensor axially being arranged in juxtaposition along steel strand wires (1).
2. a kind of magneto strictive sensor that steel stranded wire supersonic guided wave detects that is used for according to claim 1, it is characterized in that: described saddle sheet (3) is made up of the rectangular parallelepiped that three bottoms have 120 degree arc grooves, and arc radius is identical with the radius of steel strand wires (1).
3. a kind of magneto strictive sensor that steel stranded wire supersonic guided wave detects that is used for according to claim 1, it is characterized in that: the number of the step on described solenoid (6) outside surface is 4～6.
4. according to claim 1 or the described a kind of magneto strictive sensor that steel stranded wire supersonic guided wave detects that is used for of claim 2, it is characterized in that: the diameter of first enameled wire (7) of described excitation end sensor is 0.2～0.4mm.
5. according to claim 1 or the described a kind of magneto strictive sensor that steel stranded wire supersonic guided wave detects that is used for of claim 2, it is characterized in that: the diameter of the enameled wire of described receiving end sensor is 0.1～0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720169811XU CN201072332Y (en) | 2007-07-20 | 2007-07-20 | Magnetostrictive transducer used for detecting cable ultrasound guided wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720169811XU CN201072332Y (en) | 2007-07-20 | 2007-07-20 | Magnetostrictive transducer used for detecting cable ultrasound guided wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201072332Y true CN201072332Y (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720169811XU Expired - Lifetime CN201072332Y (en) | 2007-07-20 | 2007-07-20 | Magnetostrictive transducer used for detecting cable ultrasound guided wave |
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| CN (1) | CN201072332Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013078981A1 (en) * | 2011-11-30 | 2013-06-06 | 浙江大学 | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| CN105738474A (en) * | 2016-04-14 | 2016-07-06 | 华南理工大学 | Needle-shaped ultrasonic guided wave detecting device and method for stranded wire structure damage |
-
2007
- 2007-07-20 CN CNU200720169811XU patent/CN201072332Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013078981A1 (en) * | 2011-11-30 | 2013-06-06 | 浙江大学 | Stress monitoring device of magneto-elastic and magneto-electric effect type |
| CN105738474A (en) * | 2016-04-14 | 2016-07-06 | 华南理工大学 | Needle-shaped ultrasonic guided wave detecting device and method for stranded wire structure damage |
| CN105738474B (en) * | 2016-04-14 | 2018-10-30 | 华南理工大学 | One kind is towards the needle-shaped formula ultrasonic guided wave detection device of twisted wire structural damage and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070720 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |