CN109759307A - A kind of electromagnetic acoustic phase array transducer of focus adjustable - Google Patents
A kind of electromagnetic acoustic phase array transducer of focus adjustable Download PDFInfo
- Publication number
- CN109759307A CN109759307A CN201811623474.6A CN201811623474A CN109759307A CN 109759307 A CN109759307 A CN 109759307A CN 201811623474 A CN201811623474 A CN 201811623474A CN 109759307 A CN109759307 A CN 109759307A
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- coil
- electromagnetic acoustic
- array transducer
- phase array
- permanent magnet
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- 238000000034 method Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- 239000000523 sample Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000002604 ultrasonography Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 abstract description 3
- 230000001066 destructive effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 235000019169 all-trans-retinol Nutrition 0.000 description 1
- 239000011717 all-trans-retinol Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention belongs to ultrasonic non-destructive inspection techniques fields, and in particular to a kind of electromagnetic acoustic phase array transducer of the focus adjustable for ultrasound detection.The energy converter includes the permanent magnet (2) and electromagnetic acoustic coil (4) with examined workpiece (6) cooperating, the electromagnetic acoustic coil (4) is attached to examined workpiece (6) outer surface, the electromagnetic acoustic coil (4) is made of the absolute coil of the concentric circles of multiple and different diameters, it is provided with probing shell (1) outside the permanent magnet (2), a scale copper (3) is provided between permanent magnet (2) and electromagnetic acoustic coil (4)；In the absolute coil of the concentric circles of multiple and different diameters, there is adjustable relative time delay Δ t between inner ring coil and the exciting current of outer ring coil.Phased-array technique is applied in electromagnet ultrasonic changer by the present invention, the effect of electrical adjustment probe focal length can be realized, so that electromagnetic acoustic technology is more widely applied by the current phase of each coil of change.
Description
Technical field
The invention belongs to ultrasonic non-destructive inspection techniques fields, and in particular to a kind of electricity of the focus adjustable for ultrasound detection
Magnetic ultrasonic phased array transducer.
Background technique
Traditional piezoelectric ultrasonic transducer is the piezoelectric effect principle excitation ultrasound wave by piezo-electric crystal, it is necessary to by water or
Ultrasonic wave could be passed in examined workpiece by the acoustic coupling mediums such as oil, all encountered in many field piezoelectric supersonics and be difficult to overcome
Difficulty, there is no need to the electromagnetic acoustic detection techniques of couplant to come into being.
The difference of electromagnetic supersonic flaw detecting technology and traditional piezoelectric supersonic inspection technique is only that the mode for generating ultrasonic wave
Difference, the coil and external magnetic field that electromagnet ultrasonic changer passes to high-frequency current by one form, while workpiece itself also belongs to
One indispensable component part of energy converter, ultrasonic wave directly generate in workpiece.
Since electromagnetic acoustic does not need acoustic coupling medium, so there have piezoelectric supersonic that can not replace in many fields to be excellent
Gesture is that minority can adapt to one of lossless detection method detected under intermediate stage adverse circumstances.Meanwhile with microelectric technique
And the development of computer technology, phased-array technique is applied in electromagnet ultrasonic changer, it can be by changing each coil
Current phase, realize electrical adjustment probe focal length effect so that electromagnetic acoustic technology is more widely applied.In for example,
State application for a patent for invention No.201710942500.0 discloses a kind of ' electromagnetic acoustic phase array transducer ' (applying date
2017.10.11), which includes permanent magnet, multi-channel coil, shielded wire and plug；The multi-channel coil is fixed on
The lower section of permanent magnet；One end of the shielded wire is connected with multi-channel coil, and the other end of shielded wire is connected with plug, but
It is that the means focused are not provided.
Summary of the invention
It is an object of the invention to overcome the problems of the above-mentioned prior art, a kind of electromagnetic acoustic of focus adjustable is provided
Phase array transducer.
To achieve the above object, technical solution provided by the invention is as follows:
A kind of electromagnetic acoustic phase array transducer of focus adjustable, it includes the permanent magnet 2 with 6 cooperating of examined workpiece
With electromagnetic acoustic coil 4, the electromagnetic acoustic coil 4 is attached to 6 outer surface of examined workpiece, and the electromagnetic acoustic coil 4 is by multiple
The absolute coil of the concentric circles of different-diameter forms, and probing shell 1 is provided with outside the permanent magnet 2, and permanent magnet 2 and electromagnetism are super
A scale copper 3 is provided between sound coil 4；
In the absolute coil of the concentric circles of multiple and different diameters, have between inner ring coil and the exciting current of outer ring coil
There is adjustable relative time delay Δ t.
Each absolute coil of the electromagnetic acoustic coil 4 is that the coiling of single turn conducting wire forms, and all coils form one and put down
Face concentric circles.
The energy converter generates the ultrasonic shear wave with adjustable axial focal length, the ultrasonic shear wave inside examined workpiece 6
The direction of motion perpendicular to 6 surface of examined workpiece.
Relative time delay Δ t between absolute coil of the energy converter by adjusting different-diameter, adjustment energy converter work institute
The focal length needed.
The permanent magnet 2 has steady magnetic field B, surface of the magnetic direction perpendicular to examined workpiece 6.
For the consistency of each absolute coil electrical impedance of electromagnetic acoustic coil 4 described in guarantee coiling, each absolute coil
Line footpath it is incremented by successively from inside to outside, between absolute coil spacing be 0.1 ± 0.01mm.
The probing shell 1 is process by aluminium alloy or stainless steel material, and permanent magnet 2 is prepared using NdFeB material.
The scale copper 3 is with a thickness of 0.1~0.2mm.
It is provided with wear plate 5 before the electromagnetic acoustic coil 4, material is potsherd or high-resistance alloy, with a thickness of 0.5 ±
0.1mm。
The beneficial effects of the present invention are:
Difference with the prior art of the present invention is: the present invention improves loop construction, the shape of probe coil
Formula is plane concentric circles, and is the consistency for guaranteeing each absolute coil electrical impedance of coiling, the line footpath of each absolute coil by
It is incremented by successively from inside to outside, by changing the current phase in absolute coil, focus adjustable, direction of propagation vertical workpiece can be formed
The shearing wave on surface.
1. the electromagnetic acoustic phase array transducer for the focus adjustable that the present invention obtains does not need to visit as traditional piezoelectric supersonic
Wound like that can excitation ultrasound wave using liquid couplant；2. focused beam can be formed in metal without acoustic lens；
3. focus adjustable can significantly improve the detection sensitivity and sensitive area of electromagnet ultrasonic changer.
Detailed description of the invention
Fig. 1 is electromagnet ultrasonic changer structural schematic diagram of the invention.
Fig. 2 is electromagnetic acoustic shearing wave excitation principle schematic diagram of the invention.
Fig. 3 is varifocal electromagnet ultrasonic changer phased-array coil schematic diagram of the invention.
Appended drawing reference are as follows:
1 probing shell, 2 permanent magnet
3 scale copper, 4 electromagnetic acoustic coil
5 wear plate, 6 examined workpiece
J induced current FLLorentz force
B steady magnetic field
Specific embodiment
Invention is further explained with reference to the accompanying drawings and examples.
Fig. 1 show a kind of structural schematic diagram of the electromagnetic acoustic phase array transducer of focus adjustable of the present invention, the transducing
Device includes permanent magnet 2, electromagnetic acoustic coil 4；Wherein:
Electromagnetic acoustic coil 4 is made of the absolute coil of multiple concentric circles, to guarantee electromagnetic acoustic coil 4 described in coiling
The consistency of each absolute coil electrical impedance, the line footpath of each absolute coil is incremented by successively from inside to outside, and spacing is between coil
0.1mm；
Probing shell 1 is process by aluminium alloy or austenitic stainless steel, and permanent magnet 2 is placed in therebetween；Permanent magnet 2 uses magnetic
The big NdFeB material of energy product.
A scale copper, thickness about 0.1~0.2mm, to shield are placed between high permanent magnet 2 and electromagnetic acoustic coil 4
The back scattering of electromagnetic acoustic coil 4.
It is wear plate 5 before electromagnetic acoustic coil 4, material is potsherd or high-resistance alloy piece, with a thickness of 0.5mm.
The course of work of the invention is as follows:
Referring to fig. 2, it when high-frequency electromagnetic ultrasound coil 4 flows through high-frequency pulse current, can be induced in metal material surface
Induced current J, if this induced current J is in the steady vertical magnetic field B of the generation of permanent magnet 2, charged particle herein
Necessarily by Lorentz force FLEffect, and due to being high-frequency current, charged particle is in Lorentz force FLUnder the action of can produce
Raw high-frequency vibration, the frequency of this vibration is consistent with power frequency, and direction of vibration is parallel to metal material surface, when this is vibrated to gold
When belonging to material internal propagation, ultrasonic shear wave is just formd.This process is reversible, we also can receive corresponding accordingly
Reflection echo.
Referring to Fig. 3, when the high frequency pumping current in phase position being passed through to all monocycle coils, generated ultrasonic wave is not
It focuses, but ought successively change the current phase of each coil in electromagnetic acoustic coil 4, so that from inner ring coil to outer ring coil
Exciting current have relative time delay Δ t (phase), can pass through this delay rule realize acoustic beam axial focusing.And with electricity
The variation of exciting current signal delay Δ t (phase) in magnetic ultrasound coil 4, realizes the size electronically focused.
Detection of embodiment -- the energy converter for forging or square billet:
Pass to the high-frequency pulse string driving signal of constant phase difference respectively in the probe coil 4 (Fig. 3) of energy converter,
The pure shear wave with certain focal length is motivated, and then realizes shear wave focus detection, and in the detection sensitivity highest of near focal point.
When needing to change focal position, only need to changing the phase of current drive signal, (i.e. relative time delay Δ t), can be obtained focal length
(i.e. sensitive area) different focusing acoustic field.
Claims (9)
1. a kind of electromagnetic acoustic phase array transducer of focus adjustable, it includes the permanent magnet with examined workpiece (6) cooperating
(2) and electromagnetic acoustic coil (4), it is characterised in that: the electromagnetic acoustic coil (4) is attached to examined workpiece (6) outer surface, should
Electromagnetic acoustic coil (4) is made of the absolute coil of the concentric circles of multiple and different diameters, is provided with spy outside the permanent magnet (2)
Head shell (1), is provided with a scale copper (3) between permanent magnet (2) and electromagnetic acoustic coil (4)；
In the absolute coil of the concentric circles of multiple and different diameters, having between inner ring coil and the exciting current of outer ring coil can
The relative time delay Δ t of adjusting.
2. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: the electromagnetism is super
Each absolute coil of sound coil (4) is that the coiling of single turn conducting wire forms, and all coils form a plane concentric circles.
3. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: the energy converter exists
Generate the ultrasonic shear wave with adjustable axial focal length inside examined workpiece (6), the direction of motion of the ultrasonic shear wave perpendicular to
Examined workpiece (6) surface.
4. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: the energy converter is logical
Overregulate the relative time delay Δ t between the absolute coil of different-diameter, focal length needed for adjustment energy converter work.
5. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: the permanent magnet
(2) there is steady magnetic field B, surface of the magnetic direction perpendicular to examined workpiece (6).
6. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: to guarantee coiling
The consistency of each absolute coil electrical impedance of the electromagnetic acoustic coil (4), the line footpath of each absolute coil from inside to outside according to
Secondary to be incremented by, spacing is 0.1 ± 0.01mm between absolute coil.
7. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: outside the probe
Shell (1) is process by aluminium alloy or stainless steel material, and permanent magnet (2) is prepared using NdFeB material.
8. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: the scale copper
(3) with a thickness of 0.1~0.2mm.
9. the electromagnetic acoustic phase array transducer of focus adjustable according to claim 1, it is characterised in that: the electromagnetism is super
It is provided with before sound coil (4) wear plate (5), material is potsherd or high-resistance alloy, with a thickness of 0.5 ± 0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811623474.6A CN109759307B (en) | 2018-12-28 | 2018-12-28 | Electromagnetic ultrasonic phased array transducer with adjustable focal length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811623474.6A CN109759307B (en) | 2018-12-28 | 2018-12-28 | Electromagnetic ultrasonic phased array transducer with adjustable focal length |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109759307A true CN109759307A (en) | 2019-05-17 |
| CN109759307B CN109759307B (en) | 2023-11-21 |
Family
ID=66451663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811623474.6A Active CN109759307B (en) | 2018-12-28 | 2018-12-28 | Electromagnetic ultrasonic phased array transducer with adjustable focal length |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458414A (en) * | 2020-04-24 | 2020-07-28 | 哈尔滨工业大学 | Ultrasonic phased array transducer device with one-dimensional hinge array structure |
| CN111811708A (en) * | 2020-07-23 | 2020-10-23 | 北京理工大学 | Mechanical component ultrasonic testing device and method based on magnetic fluid coupling |
| CN111871747A (en) * | 2020-07-31 | 2020-11-03 | 零声科技(苏州)有限公司 | Capacitance-sensing type electromagnetic ultrasonic transducer |
| CN114054328A (en) * | 2021-10-22 | 2022-02-18 | 天津大学 | Short-focus ultrasonic transducer with adjustable focus and focus calculation algorithm thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013011468A (en) * | 2011-06-28 | 2013-01-17 | Hitachi Engineering & Services Co Ltd | Ultrasonic probe, and device and method for ultrasonic inspection using the same |
| CN103549977A (en) * | 2013-11-05 | 2014-02-05 | 深圳大学 | Transcranial Doppler plane annular phased array probe |
| CN204044114U (en) * | 2014-07-16 | 2014-12-24 | 浙江省交通规划设计研究院 | A kind of ring-shaped ultrasonic array energy transducer |
| CN105758938A (en) * | 2016-03-03 | 2016-07-13 | 中南大学 | 550-DEG C high-temperature metal material electromagnetic ultrasonic flaw detection method and device |
-
2018
- 2018-12-28 CN CN201811623474.6A patent/CN109759307B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013011468A (en) * | 2011-06-28 | 2013-01-17 | Hitachi Engineering & Services Co Ltd | Ultrasonic probe, and device and method for ultrasonic inspection using the same |
| CN103549977A (en) * | 2013-11-05 | 2014-02-05 | 深圳大学 | Transcranial Doppler plane annular phased array probe |
| CN204044114U (en) * | 2014-07-16 | 2014-12-24 | 浙江省交通规划设计研究院 | A kind of ring-shaped ultrasonic array energy transducer |
| CN105758938A (en) * | 2016-03-03 | 2016-07-13 | 中南大学 | 550-DEG C high-temperature metal material electromagnetic ultrasonic flaw detection method and device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458414A (en) * | 2020-04-24 | 2020-07-28 | 哈尔滨工业大学 | Ultrasonic phased array transducer device with one-dimensional hinge array structure |
| CN111458414B (en) * | 2020-04-24 | 2021-06-15 | 哈尔滨工业大学 | Ultrasonic phased array transducer device with one-dimensional hinge array structure |
| CN111811708A (en) * | 2020-07-23 | 2020-10-23 | 北京理工大学 | Mechanical component ultrasonic testing device and method based on magnetic fluid coupling |
| US11835407B2 (en) | 2020-07-23 | 2023-12-05 | Beijing Institute Of Technology | Device and method for ultrasonic detecting of mechanical member based on magnetic fluid coupling |
| CN111871747A (en) * | 2020-07-31 | 2020-11-03 | 零声科技(苏州)有限公司 | Capacitance-sensing type electromagnetic ultrasonic transducer |
| CN114054328A (en) * | 2021-10-22 | 2022-02-18 | 天津大学 | Short-focus ultrasonic transducer with adjustable focus and focus calculation algorithm thereof |
| CN114054328B (en) * | 2021-10-22 | 2023-03-14 | 天津大学 | Short-focus ultrasonic transducer with adjustable focus and focus calculation algorithm thereof |
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| Publication number | Publication date |
|---|---|
| CN109759307B (en) | 2023-11-21 |
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