CN206373042U - A kind of transceiver electromagnet ultrasonic changer of low noise - Google Patents
A kind of transceiver electromagnet ultrasonic changer of low noise Download PDFInfo
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- CN206373042U CN206373042U CN201621456689.XU CN201621456689U CN206373042U CN 206373042 U CN206373042 U CN 206373042U CN 201621456689 U CN201621456689 U CN 201621456689U CN 206373042 U CN206373042 U CN 206373042U
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- coil
- receiving coil
- transmitting coil
- permanent magnet
- transceiver
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- 230000003750 conditioning effect Effects 0.000 abstract description 5
- 238000004804 winding Methods 0.000 abstract description 5
- 238000002604 ultrasonography Methods 0.000 abstract description 3
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model discloses a kind of transceiver electromagnet ultrasonic changer of low noise, transducer is by test specimen to be measured, printed circuit board, transmitting coil, permanent magnet and receiving coil composition, transmitting coil is arranged on the different layers of same printed circuit board and is arranged alternately with receiving coil, permanent magnet is placed on above transmitting coil and receiving coil, transmitting coil and receiving coil share a block permanent magnet to provide bias magnetic field, transmitting coil and receiving coil are placed on test block to be checked, transmitting coil is connected with power amplifier, and receiving coil is connected with signal conditioning circuit.The utility model is by changing transducer winding structure type, increase the length of winding wire, change the shape of the wire reverse of the adjacent half-wavelength of coil, so that the current vortex produced by the reverse of coil side is not influenceed by the quiescent biasing magnetic field of permanent magnet, so as to reduce due to the ultrasound clutter interference that side coil is produced, signal to noise ratio is improved.
Description
Technical field：
The utility model is related to electromagnetic ultrasonic non-destructive detection technique, the transceiver electromagnetic acoustic of specially a kind of low noise
Transducer.
Background technology：
Electromagnet ultrasonic changer (Electromagnetic acoustic transducer, abbreviation EMAT) is a kind of sharp
Hair and the device for receiving ultrasonic wave.The device is simple in construction without acoustic couplant, can easily excite the ultrasound of various modes
Ripple, can be achieved non-cpntact measurement, therefore extensively paid close attention to by researcher.Electromagnet ultrasonic changer is mainly made up of 3 parts：Launch, connect
Take-up circle, magnet and test specimen to be measured.Because the conversion efficiency of electromagnet ultrasonic changer is than relatively low, the ultrasonic signal inspired is extremely
It is faint, cause the signal to noise ratio of signal received relatively low, be easily interfered, cause to be also easy to produce erroneous judgement during measurement, will interference letter
Number as flaw indication.Inflection coil is widely used exciting and receiving coil as ultrasonic transducer, in manufacturing process,
All it is to use right angle cabling between the winding wire of adjacent one-half wavelength distance, and right angle cabling can become the line width of transmission line
Change, cause the discontinuous of impedance, the influence for there are three aspects to signal of right angle cabling：One is that turning can be equivalent to transmission line
On capacitive load, slow down the rise time；Two be that impedance discontinuity can cause the reflection of signal；Three be the generation of right angle tip
EMI so that the current vortex skewness produced on test specimen to be measured, so that intensity distribution when causing ultrasonic excitation is uneven, shadow
Ring Detection results.On the other hand, existing use inflection coil as excitation coil electromagnet ultrasonic changer, the length of magnet and
Width is all higher than the length and width of coil, because the length of magnet is more than the length of wire so that inflection coil is separated by half-wave
Connecting wire between the wire of long range, which also causes, produces ultrasonic wave in test specimen to be measured, when transducer is both also served as transmitting
This part of ultrasonic signal will be included during reception, in the signal received, this part signal just becomes our institutes not
Desired noise, when for measuring width less test specimen, the influence of this noise is particularly evident.
Utility model content：
The purpose of this utility model be to provide a kind of single magnet, transceiver and receive and transmitting coil is discrete should
The electromagnet ultrasonic changer detected for narrow boards, reduces the ultrasonic signal noise due to side coil generation to measurement result shadow
Ring.
The utility model is adopted the following technical scheme that：The transceiver electromagnet ultrasonic changer of a kind of low noise, by be measured
Test specimen, printed circuit board, transmitting coil, permanent magnet and receiving coil composition, the transmitting coil are arranged on together with receiving coil
On the different layers of one printed circuit board and different layers are disposed alternately at, permanent magnet is placed on transmitting coil and receiving coil
Face, the transmitting coil and receiving coil share a block permanent magnet to provide bias magnetic field, and transmitting coil and receiving coil are placed
On test block to be checked, transmitting coil is connected with external power amplifier, for producing ultrasonic wave inside test specimen to be measured, is received
Coil is connected with external signal modulate circuit, for detecting the ultrasonic vibration in test specimen to be measured.
Further, the length L2 of the transmitting coil and receiving coil is more than the length L1 of permanent magnet.
Further, the length L2 of the transmitting coil and receiving coil is more than 1.2 times of the length L1 of permanent magnet.
Further, the spacing distance in the transmitting coil between wire for the ultrasonic wave to be excited half-wavelength.
Further, the area of each cross section of wire is the same in the transmitting coil.
Further, the area of each cross section of wire is the same in the receiving coil.
Further, the transmitting coil and the receiving coil reverse between adjacent wire of half-wavelength are circular arc.
The utility model is also adopted the following technical scheme that：A kind of work of the transceiver electromagnet ultrasonic changer of low noise
Make, comprise the following steps：
Step one：The signal generator being connected by being connected with power amplifier produces burst pumping signal, pumping signal
After-applied on transmitting coil through power amplification, transmitting coil induces current vortex on test specimen to be measured, and current vortex is in permanent magnet
Lorentz force is produced under the quiescent biasing magnetic fields of generation in test specimen to be measured, dynamic Lorentz forces are acted in test specimen to be measured
Produce ultrasonic wave；
Step 2：Ultrasonic wave is propagated in test specimen to be measured, runs into defect or border back reflection echo-signal, when echo warp
When crossing below receiving coil, the Particles Moving cutting permanent magnet inside test specimen to be measured produces the magnetic line of force and produces electric current and form dynamic
Electric field, dynamic electric field produces dynamic magnetic field again, and receiving coil produces dynamic current signal, dynamic electric under dynamic magnetic field effect
Flow through and be used for detecting the ultrasonic vibration in test specimen to be measured after signal conditioning circuit conditioning.
The utility model has the advantages that：The transceiver electromagnet ultrasonic changer of the utility model low noise,
By changing the structure type of transducer winding, following effect can be reached：Increase excitation variable winding conductor length so that coil sides
Current vortex produced by the reverse in face reduces the quiescent biasing magnetic field influence of permanent magnet, so as to reduce due to the production of side coil
Raw ultrasound clutter interference, improves signal to noise ratio；By transmitting coil and receiving coil design on same PCB, transmitting coil and
The wire of receiving coil is overlapping and alternately arranges on different layers, and transmitting can be achieved and receives to share same permanent magnet to provide
Bias magnetic field, during transmitting coil transmission signal, receiving coil just can sense pumping signal, record ultrasonic wave transmitting when
Between, it is to avoid in the case of sharing a coil transmissions and receiving ultrasonic wave, transmitting coil is first connected to excitation power supply transmitting letter
Number, launch and be again switched to coil in receiving circuit by switching switch after signal, regard original transmitting coil as reception
Coil, launch time point of the reception signal brought in time domain in time scale without reference to point, and circuit switching band
The problem of carrying out delay time error；Transmitting coil and receiving coil use circular arc knot at the inflection between the wire of interval half wavelength
Structure so that transmitting coil and receiving coil conductor cross-section area are consistent, impedance is continuous, and what reduction electromagnetic interference was brought makes an uproar
Sound.
Brief description of the drawings：
Fig. 1 is the profile of the utility model electromagnet ultrasonic changer.
Fig. 2 (a), Fig. 2 (b) are that transmitting coil and the length of receiving coil and permanent magnet length vs scheme.
Fig. 3 (a), Fig. 3 (b) are that conventional coil is compared figure with the utility model loop construction.
Embodiment：
The utility model is described further below in conjunction with the accompanying drawings.
The transceiver electromagnet ultrasonic changer of the utility model low noise is by test specimen 1 to be measured, printed circuit board (PCB) 2,
Transmitting coil 3, permanent magnet 4 and receiving coil 5 are constituted, and transmitting coil 3 is arranged on same multilayer printed circuit with receiving coil 5
On the different layers of plate 2 and different layers are disposed alternately at, permanent magnet 4 is placed on above transmitting coil 3 and receiving coil 5, transmitting
Coil 3 and receiving coil 5 share a block permanent magnet 4 to provide bias magnetic field, and transmitting coil 3 and receiving coil 5 are placed on to be checked
On test block 1, transmitting coil 3 is connected with external power amplifier, for producing ultrasonic wave inside test specimen 1 to be measured, receives line
Circle 5 is connected with external signal modulate circuit, for detecting the ultrasonic vibration in test specimen 1 to be measured.
Transmitting coil 3 is arranged on the different layers of same multilayer printed circuit board 2 and is disposed alternately at receiving coil 5
Different layers, transmitting coil 3 works independently with receiving coil 5, and same transducer can both launch ultrasonic wave, can also receive
Ultrasonic wave, it is to avoid one-coil transducer not only as transmitting coil but also as receiving coil used time complicated control switching circuit,
Reduce circuit and switch the brought time difference.The length L2 of transmitting coil 3 and receiving coil 5 is more than the length L1 of permanent magnet 4, and hair
The length L2 of ray circle 3 and receiving coil 5 is more than 1.2 times of the length L1 of permanent magnet 4, i.e., wire inflection side is in permanent magnet 4
Outside, permanent magnet 4 is placed on to the middle part of wire, when exciting current is by transmitting coil 3 and receiving coil 5, emission lines
The current vortex of circle 3 and receiving coil 5 between the wire of half-wavelength of interval produced by reverse wire not by permanent magnet produce it is quiet
The effect of state bias magnetic field and produce ultrasonic hash.
The spacing distance that transmitting coil 3 is used to produce between the wire of ultrasonic wave is the half-wavelength of ultrasonic wave, and wire it
Between use at inflection with the prismatic circular sliding slopes of conductor width, the area of each cross section of wire is the same, sectional area of wire
Uniformity, it is to avoid the connection between wire of half-wavelength causes sectional area of wire to change and causes wire to hinder using right angle turns
It is anti-to change, while eliminating electromagnetic interference caused by the charge concentration of inflection sharp corner, reduce noise.
During detection, pumping signal of bursting is produced by signal generator, pumping signal arrives emission lines through power amplification is after-applied
On circle 3, transmitting coil 3 induces current vortex on test specimen 1 to be measured, and current vortex is made in the quiescent biasing magnetic field that permanent magnet 4 is produced
Lorentz force is produced in test specimen 1 to be measured under, dynamic Lorentz forces act in test specimen 1 to be measured and produce ultrasonic wave；Ultrasonic wave
Propagated in test specimen 1 to be measured, run into defect or border back reflection echo-signal, it is to be measured when echo is by below transducer
Particles Moving inside test specimen 1 cuts the magnetic line of force of the generation of permanent magnet 4 and produces electric current formation dynamic electric field, and dynamic electric field is again
Dynamic magnetic field is produced, receiving coil 5 produces dynamic current signal under dynamic magnetic field effect, and dynamic current is through signal conditioning circuit
The foundation of detection is used as after conditioning.Shown in Fig. 2, the transmitting coil 3 of electromagnet ultrasonic changer and the length L2 of receiving coil 5 are forever
More than 1.2 times of the length L1 of magnet 4, wire inflection side is outside permanent magnet 4, so as to avoid wire inflection side in quiescent biasing magnetic field
Effect is lower to produce useless interference noise.Fig. 3 (a) is traditional coil, is to use straight line at its inflection, point can be produced at inflection
Angle, interfacial area of the wire at inflection becomes big, conductor impedance change, and sharp corner produces charge buildup；3 (b) is that this practicality is new
Traverse design at coil designed by type, inflection is into semicircle arcuation, and sectional area of the wire at inflection is constant, and wire is each transversal
The impedance in face is consistent, so as to reduce the reflection of signal.Due to without the wedge angle at inflection, therefore avoid because electric charge collection skin is imitated
Electric charge should be caused in electromagnetic interference caused by sharp corner accumulation, so as to improve the signal to noise ratio of electromagnet ultrasonic changer.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, some improvement can also be made on the premise of the utility model principle is not departed from, these improvement also should be regarded as
Protection domain of the present utility model.
Claims (7)
1. a kind of transceiver electromagnet ultrasonic changer of low noise, it is characterised in that：By test specimen to be measured (1), printed circuit board
(2), transmitting coil (3), permanent magnet (4) and receiving coil (5) composition, the transmitting coil (3) are arranged on receiving coil (5)
On the different layers of same printed circuit board (2) and different layers are disposed alternately at, permanent magnet (4) is placed on transmitting coil (3)
With receiving coil (5) above, the transmitting coil (3) and receiving coil (5) share a block permanent magnet (4) to provide biasing magnetic
, transmitting coil (3) and receiving coil (5) are placed on test block to be checked (1), transmitting coil (3) and external power amplifier
Connection, for producing ultrasonic wave inside test specimen to be measured (1), receiving coil (5) is connected with external signal modulate circuit, for examining
The ultrasonic vibration surveyed in test specimen to be measured (1).
2. the transceiver electromagnet ultrasonic changer of low noise as claimed in claim 1, it is characterised in that：The transmitting coil
(3) the length L2 with receiving coil (5) is more than the length L1 of permanent magnet (4).
3. the transceiver electromagnet ultrasonic changer of low noise as claimed in claim 2, it is characterised in that：The transmitting coil
(3) with the length L2 of receiving coil (5) it is more than 1.2 times of length L1 of permanent magnet (4).
4. the transceiver electromagnet ultrasonic changer of low noise as claimed in claim 3, it is characterised in that：The transmitting coil
(3) spacing distance between wire for the ultrasonic wave to be excited half-wavelength.
5. the transceiver electromagnet ultrasonic changer of low noise as claimed in claim 4, it is characterised in that：The transmitting coil
(3) area of each cross section of wire is the same in.
6. the transceiver electromagnet ultrasonic changer of low noise as claimed in claim 5, it is characterised in that：The receiving coil
(5) area of each cross section of wire is the same in.
7. the transceiver electromagnet ultrasonic changer of the low noise as described in claim 5 or 6, it is characterised in that：The hair
Ray circle (3) and receiving coil (5) reverse between adjacent wire of half-wavelength are circular arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621456689.XU CN206373042U (en) | 2016-12-28 | 2016-12-28 | A kind of transceiver electromagnet ultrasonic changer of low noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621456689.XU CN206373042U (en) | 2016-12-28 | 2016-12-28 | A kind of transceiver electromagnet ultrasonic changer of low noise |
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| CN206373042U true CN206373042U (en) | 2017-08-04 |
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| CN201621456689.XU Active CN206373042U (en) | 2016-12-28 | 2016-12-28 | A kind of transceiver electromagnet ultrasonic changer of low noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106694346A (en) * | 2016-12-28 | 2017-05-24 | 南京航空航天大学 | Low-noise transmitting and receiving integrated electromagnetic acoustic transducer and working method thereof |
| CN108802185A (en) * | 2018-06-26 | 2018-11-13 | 哈尔滨工业大学 | Metal material defects detection sensor based on impulse eddy current and electromagnetic acoustic |
| CN111399067A (en) * | 2019-01-03 | 2020-07-10 | 比亚迪股份有限公司 | Conductive foreign object detection system and method for vehicle wireless charging device |
-
2016
- 2016-12-28 CN CN201621456689.XU patent/CN206373042U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106694346A (en) * | 2016-12-28 | 2017-05-24 | 南京航空航天大学 | Low-noise transmitting and receiving integrated electromagnetic acoustic transducer and working method thereof |
| CN106694346B (en) * | 2016-12-28 | 2022-08-05 | 南京航空航天大学 | Low-noise transmitting-receiving integrated electromagnetic ultrasonic transducer and working method thereof |
| CN108802185A (en) * | 2018-06-26 | 2018-11-13 | 哈尔滨工业大学 | Metal material defects detection sensor based on impulse eddy current and electromagnetic acoustic |
| CN108802185B (en) * | 2018-06-26 | 2020-12-29 | 哈尔滨工业大学 | Metal material defect detection sensor based on pulse eddy current and electromagnetic ultrasound |
| CN111399067A (en) * | 2019-01-03 | 2020-07-10 | 比亚迪股份有限公司 | Conductive foreign object detection system and method for vehicle wireless charging device |
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