CN203629592U - Magnetic confinement pulse vortex sensor - Google Patents
Magnetic confinement pulse vortex sensor Download PDFInfo
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- CN203629592U CN203629592U CN201320848219.8U CN201320848219U CN203629592U CN 203629592 U CN203629592 U CN 203629592U CN 201320848219 U CN201320848219 U CN 201320848219U CN 203629592 U CN203629592 U CN 203629592U
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- eddy current
- current sensor
- permanent magnet
- receiving coil
- impulse eddy
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Abstract
The utility model discloses a magnetic confinement pulse vortex sensor. The magnetic confinement pulse vortex sensor comprises a bottom seat, a permanent magnet, an exciting coil, a receiving coil, an aviation plug, and an end cover, wherein the bottom seat is a cylinder the upper end of which is open and the lower end of which is enclosed, and the open end of the bottom seat is sealed by the end cover; the permanent magnetic is in a circular structure, the upper end surface and the lower surface are magnetic electrodes, the polarity of which are opposite, and which are disposed at the bottom part of the bottom seat in a coaxial manner; the receiving coil is disposed in the permanent magnet in a coaxial manner, and the exciting coil is disposed at the internal part of the receiving coil in a coaxial manner; the aviation plug is disposed at an upper part of the end cover, and used for achieving electrical connection between the external part of the exciting coil and the receiving coil. The magnetic confinement pulse vortex sensor is capable of overcoming the defect of low detection sensitivity in the prior art, and has characteristics of being compact in structure, being convenient to operate and control, and being low in heating value.
Description
Technical field
The utility model belongs to technical field of nondestructive testing, more specifically, relates to a kind of magnetic confinement impulse eddy current sensor, the sensitivity detecting for improving impulse eddy current.
Background technology
In impulse eddy current detection technique, the electromagnetic response in tested member can be equivalent to downwards, to the eddy current of external diffusion, and the Diffusion Law of eddy current can reflect size and the thickness in the tested region of test specimen.By detecting the magnetic field being produced by eddy current, just can realize the detection to tested member wall thickness reduction.But during due to detection, eddy current, to external diffusion, causes eddy current energy to disperse, and makes detection sensitivity on the low side.
CN200910061369.2 discloses a kind of to having corrosion of component detection method and the device of permeability magnetic material protective layer; wherein by reducing the magnetic permeability of magnetic conduction protective layer material; make more energy on tested member, can improve to a certain extent detection sensitivity.But the method magnetic conduction protective seam need to be magnetized into saturated or the degree of depth is saturated.In addition, the method also has the following disadvantages: for example, according to a preferred embodiment in the prior art, magnetization unit comprises permanent magnet and yoke, there is a permanent magnet below, two ends of yoke respectively absorption, the two ends magnet polarity of yoke is contrary, and when detection, the direction of magnetization of tested member is parallel with its surface, and eddy current do not had to the effect of constraint to external diffusion; According to the another kind of embodiment in the prior art, magnetization unit is set to DC magnetization coil, although the direction of magnetization of tested member is vertical with its surface while detection, which DC magnetization coil heating is serious, can affect equally accuracy of detection.Therefore, need the more rational impulse eddy current sensor of structure badly, to overcome above-mentioned defect of the prior art.
Utility model content
For the defect of prior art, the purpose of this utility model is to provide a kind of magnetic confinement impulse eddy current sensor, to improve the sensitivity that impulse eddy current detects.
For achieving the above object, the utility model provides a kind of magnetic confinement impulse eddy current sensor, and this sensor comprises base, permanent magnet, drive coil, receiving coil, aviation socket and end cap, wherein:
Described base is the cylindrical shell of upper end open lower end closed, and its openend is sealed by end cap; Described permanent magnet is circular ring, and its upper and lower end face is that magnetic pole and polarity are contrary, is coaxially arranged on the bottom of base; Described receiving coil is coaxially arranged on the inside of permanent magnet, and described drive coil is continued coaxially to arrange in its inside; Described aviation socket is arranged on end cap top, and is respectively used to realize being electrically connected between drive coil and receiving coil and outside.
As further preferably, the internal diameter of described receiving coil is greater than the external diameter of drive coil, and the external diameter of described receiving coil is less than the internal diameter of permanent magnet.
As further preferably, this impulse eddy current sensor also comprises baffle plate, and described baffle plate is fixed by screws in the central authorities of base, and presses drive coil and permanent magnet.
As further preferably, this impulse eddy current sensor also comprises and is arranged on end upper part of the cover handle.
As further preferably, described permanent magnet adopts Ferrite Material to make, and described drive coil and receiving coil adopt enamel covered wire to make.
As further preferably, described base, end cap, baffle plate and handle all adopt insulating material to make.
In general, the round ring magnet that the utility model is magnetic pole by the upper and lower end face arranging, in tested member, produce perpendicular to its surperficial bias magnetic field, retrained inductive loop in tested member to external diffusion, can significantly improve the sensitivity of detection, possess compact conformation simultaneously, be convenient to manipulation and the feature such as thermal value is low.
Accompanying drawing explanation
Fig. 1 is the structure cut-open view of the magnetic confinement impulse eddy current sensor constructed according to the utility model preferred embodiment;
Fig. 2 is the overall construction drawing of the device for testing the utility model preferred embodiment;
Fig. 3 a is the magnetic pole distribution schematic diagram load DC current in drive coil time;
Fig. 3 b is after the DC current of closing in drive coil, and in tested member, eddy current is to the bound schematic diagram of external diffusion;
Fig. 4 is the sample sketch for testing the utility model preferred embodiment;
Fig. 5 detects sample with the utility model preferred embodiment with without the impulse eddy current sensor of round ring magnet respectively, the signal waveform comparison diagram obtaining.In institute's drawings attached, identical Reference numeral is used for representing identical element or structure, wherein:
The tested member 2-of 1-impulse eddy current sensor 3-excitation control module 4-signal processing unit 5-A/D converting unit 6-computation processor 7-permanent magnet 8-base 9-through wires hole 10-handle 11-aviation socket 12-end cap 13-baffle plate 14-drive coil 15-receiving coil 16-bias magnetic field 17-eddy current
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 is the structure cut-open view of the magnetic confinement impulse eddy current sensor constructed according to the utility model preferred embodiment.As shown in Figure 1, this impulse eddy current sensor 2 comprises base 8, permanent magnet 7, drive coil 14, receiving coil 15, aviation socket 11 and end cap 12, and wherein base 8 is the cylindrical shell of upper end open lower end closed, and its openend is sealed by end cap 12; Permanent magnet 7 is circular ring, and it is coaxially arranged on the bottom of base 8, and its pole-face is respectively in upper and lower two ends; Receiving coil 15 is coaxially arranged on the inside of permanent magnet 7, and its inside continues drive coil 14 is coaxially set, and the internal diameter of receiving coil 15 can be set as being greater than the external diameter of drive coil 14, and the external diameter of receiving coil 15 can be set as being less than the internal diameter of permanent magnet 7; Aviation socket 11 is arranged on end cap 12 tops, and is respectively used to realize being electrically connected between drive coil 14 and receiving coil 15 and outside.
Fig. 2 is the overall construction drawing of the device for testing the utility model preferred embodiment.As shown in Figure 2, this device mainly comprises impulse eddy current sensor 2, excitation control module 3, signal processing unit 4, A/D converting unit 5 and computation processor 6.
Particularly, excitation control module 3 is realized and being electrically connected of drive coil 14 by aviation socket 11, for drive coil is loaded to DC current, to produce the Primary field of steady, and make the pole polarity at drive coil two ends Shang Xia 14 just in time contrary with the pole polarity at permanent magnet two ends Shang Xia 7, as shown in Figure 3 a; In addition, in the time stopping drive coil 14 to load DC current, according to Lenz law, in tested member 1, will produce eddy current 17, and constantly downwards, to external diffusion, in the time that it is diffused into the below of round ring magnet 7, eddy current 17 can be subject to the Lorentz force F as shown in Fig. 3 b because of the effect of bias magnetic field 16, its trend to external diffusion will suffer restraints, and the energy Ratios of eddy current 17 is more concentrated during without round ring magnet 7, and detection sensitivity is higher; Now, receiving coil 15 changes the secondary magnetic field producing because of eddy diffusivity to be converted to voltage signal, and sends signal processing unit 4 to.
According to a preferred implementation of the present utility model, impulse eddy current sensor 2 can also comprise baffle plate 13, and this baffle plate 13 is fixed by screws in the central authorities of base 8, and presses drive coil 14 and permanent magnet 7.For the ease of using, described impulse eddy current sensor 2 can also comprise the handle 10 that is arranged on end cap 12 tops.In addition, end cap 12 can be fixed on base 8 upper ends by circumferential four uniform screws, also can adopt other connected modes to be connected and fixed.On baffle plate 13, also have through wires hole 9, by this through wires hole 9 and aviation socket 11, realize drive coil 14, receiving coil 15 and outside being electrically connected.
According to another preferred implementation of the present utility model, described permanent magnet preferably adopts Ferrite Material to make, and described drive coil 14 and receiving coil 15 preferably adopt enamel covered wire to make.In addition, described base 8, end cap 12, baffle plate 13 and handle 10 all adopt insulating material to make.
The process of test the utility model preferred embodiment will be illustrated below.
As shown in Figure 4, for testing the stepped 16Mn steel plate that the sample of the utility model preferred embodiment is long 500mm, wide 250mm, wherein region 1. thickness be 25mm, region 2. thickness is 15mm.
When test, first the utility model preferred embodiment is placed on to specimen surface, and the surface normal of its center line and sample is coincided;
Then, load DC current by excitation control module to drive coil, to produce the Primary field of steady, and make the pole polarity at the upper and lower two ends of drive coil just in time contrary with the pole polarity at the upper and lower two ends of permanent magnet;
Then, in the DC current of closing in drive coil, measure the induced voltage the signal processing that in receiving coil, produce, obtain thus impulse eddy current detection signal.
Finally, replace the utility model preferred embodiment, repetition said process with the impulse eddy current sensor of ringless-type permanent magnet.
Fig. 5 detects sample with the utility model preferred embodiment with without the impulse eddy current sensor of round ring magnet respectively, the signal waveform comparison diagram obtaining.As shown in Figure 5, vertical axis represent signal amplitude (V), transverse axis represents the time (s).The wherein signal waveform of dotted line representative while detection without the impulse eddy current sensor of round ring magnet 7, solid line represents the signal waveform while detection with the utility model preferred embodiment.From Fig. 5 obviously, the difference of region 1. and between the signal 2. of region is larger in the time detecting with the utility model preferred embodiment, shows thus to utilize the utility model can significantly improve the sensitivity that impulse eddy current detects.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. a magnetic confinement impulse eddy current sensor, is characterized in that, this sensor comprises base (8), permanent magnet (7), drive coil (14), receiving coil (15), aviation socket (11) and end cap (12), wherein:
Described base (8) is the cylindrical shell of upper end open lower end closed, and its openend is sealed by end cap (12); Described permanent magnet (7) is circular ring, and its upper and lower end face is that magnetic pole and polarity are contrary, is coaxially arranged on the bottom of base (8); Described receiving coil (15) is coaxially arranged on the inside of permanent magnet (7), and described drive coil (14) is continued coaxially to arrange in its inside; Described aviation socket (11) is arranged on end cap (12) top, and is respectively used to realize being electrically connected between drive coil (14) and receiving coil (15) and outside.
2. magnetic confinement impulse eddy current sensor according to claim 1, is characterized in that, the internal diameter of described receiving coil (15) is greater than the external diameter of drive coil (14), and the external diameter of described receiving coil (15) is less than the internal diameter of permanent magnet (7).
3. magnetic confinement impulse eddy current sensor according to claim 1 and 2, it is characterized in that, this impulse eddy current sensor also comprises baffle plate (13), and described baffle plate (13) is fixed by screws in the central authorities of base (8), and presses drive coil (14) and permanent magnet (7).
4. magnetic confinement impulse eddy current sensor according to claim 3, is characterized in that, this impulse eddy current sensor (2) also comprises the handle (10) that is arranged on end cap (12) top.
5. magnetic confinement impulse eddy current sensor according to claim 4, is characterized in that, described permanent magnet (7) adopts Ferrite Material to make, and described drive coil (14) and receiving coil (15) adopt enamel covered wire to make.
6. magnetic confinement impulse eddy current sensor according to claim 5, is characterized in that, described base (8), end cap (12), baffle plate (13) and handle (10) all adopt insulating material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848219.8U CN203629592U (en) | 2013-12-20 | 2013-12-20 | Magnetic confinement pulse vortex sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848219.8U CN203629592U (en) | 2013-12-20 | 2013-12-20 | Magnetic confinement pulse vortex sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203629592U true CN203629592U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320848219.8U Expired - Fee Related CN203629592U (en) | 2013-12-20 | 2013-12-20 | Magnetic confinement pulse vortex sensor |
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| CN (1) | CN203629592U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370722A (en) * | 2016-10-31 | 2017-02-01 | 天津因科新创科技有限公司 | Fixing apparatus for marine pipeline pulsed eddy current detecting coil |
-
2013
- 2013-12-20 CN CN201320848219.8U patent/CN203629592U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370722A (en) * | 2016-10-31 | 2017-02-01 | 天津因科新创科技有限公司 | Fixing apparatus for marine pipeline pulsed eddy current detecting coil |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20201220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |