CN106706753A - Differential electromagnetic ultrasonic sensor and detection system - Google Patents
Differential electromagnetic ultrasonic sensor and detection system Download PDFInfo
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- CN106706753A CN106706753A CN201611089857.0A CN201611089857A CN106706753A CN 106706753 A CN106706753 A CN 106706753A CN 201611089857 A CN201611089857 A CN 201611089857A CN 106706753 A CN106706753 A CN 106706753A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a differential electromagnetic ultrasonic sensor and a detection system. The differential electromagnetic ultrasonic sensor includes a magnet, at least one layer of differential coil and a packaging outer shell, wherein each differential coil comprises two signal lines, and the two signal lines are wound round for multiple circles in one plane in parallel, so that the two signal lines are alternatively arranged from inside to outside and the directions of excitation signals transmitted in the two signal lines are the same; a first end of each signal line is used for receiving one excitation signal; second ends of the two signal lines are connected to the ground. The technical problem of low energy change efficiency of an electromagnetic ultrasonic sensor of a coil wound by a single line is solved.
Description
Technical field
The present invention relates to field of ultrasonic nondestructive detection, in particular to a kind of differential type electromagnetic ultrasonic transducer and inspection
Examining system.
Background technology
Electromagnetic acoustic detection technique realizes transducing by using electromagnetic ultrasonic transducer (EMAT), with traditional ultrasound detection
Technology is compared, and electromagnetic acoustic detection technique has high precision, do not need couplant, noncontact, is suitable to on-line quick detection and height
The advantages of temperature detector is surveyed, is industrially widely used in high-temperature thickness measuring, on-line checking, fast flaw detection etc..
Electromagnetic ultrasonic transducer using electromagnetic coupled mode, it is possible to achieve the excitation and reception of ultrasound, its is main to lack
Point is that conversion efficiency is relatively low, is easily influenceed by factors such as lift-off (gap of electromagnetic ultrasonic transducer and examined workpiece).Cause
This, the electromagnetic ultrasonic transducer for designing conversion efficiency high is the key point of electromagnetic acoustic detection technique.
Electromagnetic ultrasonic transducer general at present is mainly made up of magnet, high frequency coil, shell, and wherein high frequency coil is electricity
Magnetic sonac realizes the critical component of transducing.High frequency coil can produce vortex and move during electromagnetic acoustic excitation
State magnetic field, during reception, can be with the change of induction field so as to induced current.In the prior art, in-service electromagnetism surpasses
Formed using the single line winding mode coiling based on single-ended signal more than high frequency coil in sonic transducer, such as institute in Fig. 1 a, Fig. 1 b
Show, wherein, Fig. 1 a are the top view of high frequency coil, and Fig. 1 b are the stereogram of high frequency coil shown in Fig. 1 a.To single line coiling
The energisation mode of coil is single-ended signal energisation mode, as shown in Fig. 2 the peak-to-peak threshold voltage Upp=2V of single end driver signal0,
The periodicity of signal is N.Transmission direction of the pumping signal in holding wire and ground wire in excitation as shown in Figure 1a, is being received
When receive transmission direction of the signal in holding wire and ground wire as shown in Figure 1 b.There is coiling by the way of single line coiling
Simply, the features such as transducing is effectively and tool interface system is simple.But the transducing effect of the electromagnetic ultrasonic transducer using this kind of coil design
Rate is limited, and detection signal signal to noise ratio is low, while antijamming capability is poor, the sensitiveness to small-signal is not high.
For the conversion efficiency technical problem not high of the electromagnetic ultrasonic transducer of the coil using single line coiling, at present still
Effective solution is not proposed.
The content of the invention
A kind of differential type electromagnetic ultrasonic transducer and detecting system are the embodiment of the invention provides, at least to solve using single
The conversion efficiency of the electromagnetic ultrasonic transducer of the coil of line coiling technical problem not high.
One side according to embodiments of the present invention, there is provided a kind of differential type electromagnetic ultrasonic transducer, differential type electromagnetism
Sonac includes magnet, at least one of which differential type coil and package casing, wherein：Differential type coil includes two signals
Line, two holding wires parallel coiling multi-turn in a plane, to cause two holding wires to be alternately arranged from inside to outside and cause
The pumping signal direction transmitted in two holding wires is identical, wherein, the every first end of holding wire is used to receive an excitation letter
Number；Two second end ground connection of holding wire.
Further, differential type electromagnetic ultrasonic transducer includes multilayer differential type coil, residing for every layer of differential type coil
Plane is parallel to each other, and the pumping signal direction transmitted in every layer of differential type coil is identical.
Further, multilayer differential type coil includes adjacent ground floor differential type coil and second layer differential type coil,
Two the second ends of ground floor differential type coil connect one to one with two first ends of second layer differential type coil.
Further, every layer of differential type coil is in a plane of PCB, and the two of ground floor differential type coil
Individual second end is connected one to one with two first ends of second layer differential type coil by the via in PCB.
Further, two holding wires in differential type coil are coiled into one of following shape parallel：Ring-like, cheese, race
Channel type, inflection type and butterfly-type.
Other side according to embodiments of the present invention, additionally provides a kind of electromagnetic acoustic detecting system, including：Excitation
Source, for producing pumping signal；Signal conditioner, is connected with driving source, for being frequency and amplitude by pumping signal conditioning
Identical and opposite in phase the first pumping signal and the second pumping signal；Claim 1 to any one of claim 5 difference
Formula electromagnetic ultrasonic transducer, differential type electromagnetic ultrasonic transducer is connected with signal conditioner, for receiving the first pumping signal
With the second pumping signal vortex is produced to sense in destination object.
Further, differential type electromagnetic ultrasonic transducer includes at least one of which differential type coil, and differential type coil includes two
Root holding wire, signal conditioner is additionally operable to according to the differential signal exported in two holding wires to produce differential sense signal.
Further, also include：Signal processor, is connected with signal conditioner, for being carried out to differential sense signal
Signal transacting.
Further, signal processor includes：Preamplifier, is connected with signal conditioner, for amplifying difference inspection
Survey signal；Signal picker, is connected with preamplifier, and for gathering the differential sense signal after amplifying, driving source includes：
Signal generator, for producing pumping signal；Power amplifier, is connected, with signal generator and signal conditioner for putting
Big pumping signal.
Further, differential type electromagnetic ultrasonic transducer produce waveform for it is following any one：Shear wave, compressional wave, guided wave
And surface wave.
In embodiments of the present invention, two are received respectively by same by the coil of two interval predeterminable ranges and parallel coiling
The difference pumping signal of the opposite in phase that the conditioning of one pumping signal is obtained, and ultrasonic wave is produced according to two difference pumping signals,
Signal can also be respectively received by two coils, solve the transducing of the electromagnetic ultrasonic transducer using the coil of single line coiling
Inefficient technical problem, and then realize the technique effect of the conversion efficiency for improving electromagnetic ultrasonic transducer.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 a are the top views of a kind of optional high frequency coil of prior art；
Fig. 1 b are the stereograms of a kind of optional high frequency coil of prior art；
Fig. 2 is a kind of schematic diagram of pumping signal optionally with excitation electromagnetic ultrasonic transducer of prior art；
Fig. 3 is the schematic diagram of a kind of optional differential type coil according to embodiments of the present invention；
Fig. 4 a are the schematic diagrames of the optional differential type coil of another kind according to embodiments of the present invention；
Fig. 4 b are the schematic diagrames of the optional differential type coil of another kind according to embodiments of the present invention；
Fig. 5 is the exiting principle of a kind of optional excitation differential type electromagnetic ultrasonic transducer according to embodiments of the present invention
Schematic diagram；
Fig. 6 is that a kind of optional differential type electromagnetic ultrasonic transducer according to embodiments of the present invention receives connecing for differential signal
Receive the schematic diagram of principle；
Fig. 7 is the schematic diagram of the optional differential type coil of another kind according to embodiments of the present invention；
Fig. 8 is the schematic diagram of the optional differential type coil of another kind according to embodiments of the present invention；
Fig. 9 is the schematic diagram of the optional differential type coil of another kind according to embodiments of the present invention；
Figure 10 is the schematic diagram of the optional differential type coil of another kind according to embodiments of the present invention；
Figure 11 is the schematic diagram of a kind of optional electromagnetic acoustic detecting system according to embodiments of the present invention；
Figure 12 is the schematic diagram of the optional electromagnetic acoustic detecting system of another kind according to embodiments of the present invention；
Figure 13 is the flow chart of a kind of optional signal processing method according to embodiments of the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model of present invention protection
Enclose.
It should be noted that term " first ", " in description and claims of this specification and above-mentioned accompanying drawing
Two " it is etc. for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.Additionally, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or other intrinsic steps of equipment or unit.
Embodiment 1
According to the embodiment of the present application, there is provided a kind of embodiment of differential type electromagnetic ultrasonic transducer.The embodiment is provided
Differential type electromagnetic ultrasonic transducer can apply to differential type electromagnetic acoustic detecting system.
Fig. 3 is the schematic diagram of a kind of optional differential type coil according to embodiments of the present invention.The difference that the embodiment is provided
Fraction electromagnetic ultrasonic transducer includes magnet, at least one of which differential type coil and package casing as shown in Figure 3, wherein：Difference
Fraction coil includes two holding wires, is respectively the first holding wire 11 and secondary signal line 12, and the every first end of holding wire is used
In one pumping signal of reception.
It should be noted that two frequencies of pumping signal are identical with amplitude and opposite in phase.
First holding wire is coiled into first coil on the first plane, and first is received for the first end by the first holding wire
Pumping signal.The coil that first holding wire is coiled into can be ecto-entad coiling as shown in Figure 3, that is, the first holding wire
First end (being also pumping signal receiving terminal) be in the outside of differential type electromagnetic ultrasonic transducer.The line that first holding wire is coiled into
Circle can also coiling from inside to outside coil.
Secondary signal line be spaced with the first holding wire on the first plane the first predeterminable range it is parallel be coiled into the second coil with
(as shown in Figure 3) is mutually arranged with first coil, the second pumping signal is received for the first end by secondary signal line.
Two holding wires parallel coiling multi-turn in a plane, to cause that two holding wires are alternately arranged from inside to outside,
That is, when the direction from outside in coil to coil is seen, the first holding wire and secondary signal line wheel stream are alternately arranged, similarly, by
When direction in coil extroversion coil is seen, the first holding wire and secondary signal line are also one after the other arrangement.Meanwhile, two letters
Number drum into coil also cause that the pumping signal direction transmitted in two holding wires is identical.
Two second end ground connection of holding wire, are as shown in Figure 3 ground wire 13.
Ground wire is connected with the second end of the first holding wire and the second end of secondary signal line, for being grounded.First signal
Line and secondary signal line constitute two holding wires of difference, and loop is constituted with common ground wire.
Alternatively, ground wire can be set on the first plane：For example, by first the second end of holding wire and secondary signal line
Ground wire is drawn in the engagement of second end；Or, ground wire can also be divided into two, be extended and first by the second end of the first holding wire
Holding wire coil in opposite direction draws first ground wire, is extended and secondary signal line side by the second end of secondary signal line
Second ground wire is drawn to opposite coil, then the end of first ground wire and second ground wire is coupled together for connecing
Ground.
Alternatively, ground wire can also be arranged in the second plane, implementation method as shown in Figure 3, by PCB
On via draw the first holding wire the second end and secondary signal line the second end and be bonded together.
The differential type electromagnetic ultrasonic transducer that the embodiment is provided is by two interval predeterminable ranges and the line of parallel coiling
Circle receives two difference pumping signals of the opposite in phase obtained by the conditioning of same pumping signal respectively, and is swashed according to two difference
Encourage signal and produce ultrasonic wave, can also respectively receive signal by two coils, solve the electricity using the coil of single line coiling
The conversion efficiency of magnetic sonac technical problem not high, and then realize the conversion efficiency for improving electromagnetic ultrasonic transducer
Technique effect.
Used as a preferred scheme of such scheme, differential type electromagnetic ultrasonic transducer can include multilayer differential type line
Circle, the plane residing for every layer of differential type coil is parallel to each other, and the pumping signal direction transmitted in every layer of differential type coil is identical.
For example, differential type electromagnetic ultrasonic transducer can include two-layer differential type coil as shown in fig. 4a and fig. 4b
Scheme, wherein, the top view of the differential type coil that Fig. 4 a are provided for the embodiment, Fig. 4 b are the differential type coil shown in Fig. 4 a
Stereogram.Plane residing for every layer of differential type coil is parallel, and up and down in two-layer differential type coil, the transmission side of pumping signal
To identical, the transmission direction of detection signal is also identical.
Preferably, ground floor differential type coil adjacent in multilayer differential type coil and second layer differential type coil are connected to
Connect, specifically, a pair of two the second ends of ground floor differential type coil and two first ends one of second layer differential type coil
Should connect, as shown in fig. 4a and fig. 4b.When connecting in this way, if ground floor coil is ecto-entad coiling,
The coiling from inside to outside of second layer coil, vice versa.When pumping signal is produced, two the second ends of ground floor differential type coil
It is output end, to two first end output drive signals of second layer differential type coil, in detection signal, differential type coil connects
Echo-signal is received, two the second ends of ground floor differential type coil are input, and the sense of current in coil is second layer difference
Two first ends of formula coil are connected to two the second ends of ground floor differential type coil.
As shown in fig. 4 a, the shape that the first ground wire maps on the first plane can partially overlap with the first holding wire, the
The shape that two ground wires map in the second plane can partially overlap with secondary signal line.Also, the first ground wire is in the first plane
The shape of upper mapping is mutually symmetrical with the first holding wire, and the shape that the second ground wire maps in the second plane is mutual with secondary signal line
For symmetrical.As shown in Figure 4 b, the first via and the second via can be the vias for extending vertically through PCB.
Signal transmission direction shown in Fig. 4 a is the transmission direction of differential type coil pumping signal during excitation, first
Holding wire receive signal+, secondary signal line receive signal-, signal+and signal-be two pumping signals of opposite in phase.At this
The differential type electromagnetic ultrasonic transducer of embodiment receives pumping signal to produce during ultrasonic wave, the first holding wire and secondary signal line
In pumping signal transmission direction as is shown in fig. 4 a.Its exiting principle as shown in figure 5, the first holding wire receive signal+, peak
Crest voltage U ' pp=2V0, the periodicity of signal is N, secondary signal line receive signal-, peak-to-peak threshold voltage U " pp=2V0, signal
Periodicity be N, and signal-phase and signal+opposite.
Signal transmission direction shown in Fig. 4 b is signal transmission direction of the differential type coil when detection signal is received, difference
The direction of signal is received after formula is coil-induced as shown in fig 4b.Detect the principle of induced signal as shown in fig. 6, to differential type
Two induced signals that coil is received are performed and seek poor signal condition process, obtain peak-to-peak value for Upp=4V0Differential received letter
Number.
For single-ended signal excitation, in the case where driving voltage is not changed, provided using the embodiment of the present invention
Differential type electromagnetic ultrasonic transducer can obtain the stronger detection signal of intensity.Further, since interference signal is same in detection process
When in the presence of the induced signal received with two-way in, can eliminate common mode interference signal in induced signal by asking difference treatment, improve
The antijamming capability of electromagnetic ultrasonic transducer.
Preferably, the coil in the differential type electromagnetic ultrasonic transducer that the embodiment is provided can be load with PCB
Body, every layer of differential type coil is in a plane of PCB, two second ends and second of ground floor differential type coil
Two first ends of layer differential type coil are connected one to one by the via in PCB.
Alternatively, the coil in the differential type electromagnetic ultrasonic transducer that the present invention is provided is also designed to such as Fig. 7~figure
Pattern shown in 10.
Fig. 7 is a kind of racetrack differential type coil of differential type；Fig. 8 is a kind of cheese differential type coil of differential type, Fig. 4
It is a kind of annular differential type coil of differential type, pancake coil has one with the holding wire for being distinguished as pancake coil of loop coil
Fixed width degree, and annular holding wire is thinner thread；Fig. 9 is a kind of inflection coil of differential type；Figure 10 is a kind of differential type
Butterfly shaped coilses.
Wherein, pancake coil, loop coil, racetrack-type rotor coil, butterfly shaped coilses are generally used for producing straight incidence shear wave or vertical
Ripple, and inflection coil is generally used for producing oblique incidence sound wave.Additionally, above-mentioned differential type electromagnetic ultrasonic transducer can also be applied
In electromagnetic ultrasonic guide wave sensor, guided wave is received for encouraging.
The differential type electromagnetic ultrasonic transducer that above-described embodiment is provided also including magnet and package casing etc., use by package casing
In encapsulation magnet and differential type coil.
Embodiment 2
According to present invention also provides a kind of embodiment of electromagnetic acoustic detecting system.
Figure 11 is the schematic diagram of a kind of optional electromagnetic acoustic detecting system according to embodiments of the present invention.Such as Figure 11 institutes
Show, the system includes driving source 10, signal conditioner 20 and differential type electromagnetic ultrasonic transducer 30.
Driving source, for producing pumping signal；Signal conditioner, is connected with driving source, for pumping signal to be nursed one's health
For frequency is identical with amplitude and the first pumping signal of opposite in phase and the second pumping signal；Differential type electromagnetic acoustic of the invention
Sensor, is connected with signal conditioner, feels with destination object for receiving the first pumping signal and the second pumping signal
Vortex should be produced.
Wherein, destination object is close to differential type electromagnetic ultrasonic transducer to produce the object of induction, specifically,
It can be examined workpiece.
Preferably, two holding wires of differential type coil are additionally operable to receive the first reception signal and the second reception letter respectively
Number, signal conditioner is additionally operable to be received to first signal and the second reception differential signal to produce differential received signal.
Preferably, differential type electromagnetic ultrasonic transducer includes differential type coil, and differential type coil includes two holding wires, letter
Number conditioner is additionally operable to according to the differential signal exported in two holding wires to produce differential sense signal.
Preferably, also include：Signal processor, is connected with signal conditioner, for carrying out letter to differential sense signal
Number treatment.
Preferably, signal processor includes：Preamplifier, is connected with signal conditioner, for amplifying Differential Detection
Signal；Signal picker, is connected with preamplifier, for gathering the differential sense signal after amplifying.
Wherein, preamplifier, when being amplified to differential sense signal, can be that differentiated signal is put
First two signals were amplified greatly, or respectively before two detection signals carry out difference, then be input to signal conditioner
Carry out difference.
Preferably, driving source includes：Signal generator, for producing pumping signal；Power amplifier, with signal generator
It is connected with signal conditioner, for amplifying pumping signal.
Preferably, differential type electromagnetic ultrasonic transducer produce waveform for it is following any one：Shear wave, compressional wave, guided wave and
Surface wave.
Figure 12 is the schematic diagram of the optional electromagnetic acoustic detecting system of another kind according to embodiments of the present invention.Such as Figure 12 institutes
Show, the electromagnetic acoustic detecting system includes：
Driving source, driving source includes signal generator and power amplifier.Signal generator is used to produce pumping signal, work(
Rate amplifier is used to amplify pumping signal.Driving source is connected with signal conditioner, and pumping signal is divided into two by signal conditioner
The pumping signal of individual difference：First pumping signal and the second pumping signal, and respectively by signal+and-two holding wires of signal
It is transmitted, loop is constituted with ground wire, wherein, two exciting signal frequencies of difference are identical with amplitude but opposite in phase.
Differential type electromagnetic acoustic detecting system includes differential type electromagnetic ultrasonic transducer provided in an embodiment of the present invention, passes through
First holding wire and secondary signal line of the differential type coil in differential type electromagnetic ultrasonic transducer are received after the signal of sensing,
Two signals of difference are carried out by signal conditioner again to ask poor treatment, and is sent to preamplifier, be last transmitted to letter
Number collector carries out Signal acquiring and processing.
Embodiment 3
According to present invention also provides a kind of embodiment of signal processing method.The signal processing method that the embodiment is provided
Electromagnetic acoustic detecting system is applied to, electromagnetic acoustic detecting system includes：Driving source, the signal condition being connected with driving source
Device, and the differential type electromagnetic ultrasonic transducer being connected with signal conditioner.
As shown in figure 13, the signal processing method that the embodiment is provided includes：
Step S101, driving source generation pumping signal；Step S102, signal conditioner nurses one's health pumping signal to obtain frequency
First pumping signal identical with amplitude and opposite in phase and the second pumping signal；Step S103, differential type electromagnetic acoustic sensing
Device receives the first pumping signal and the second pumping signal to sense generation vortex in destination object.Wherein, destination object be with
Differential type electromagnetic ultrasonic transducer is close to produce the object of induction, for example, examined workpiece.
Preferably, the method can also include：Differential type electromagnetic ultrasonic transducer produces two detection signals；Signal condition
Device is performed to two detection signals asks difference treatment to obtain differential sense signal.
It should be noted that, although show the logical order of step in flow charts, but in some cases, can be with
Shown or described step is performed with different from order herein.
Above-mentioned the embodiment of the present application sequence number is for illustration only, and the quality of embodiment is not represented.
In above-described embodiment of the application, the description to each embodiment all emphasizes particularly on different fields, and does not have in certain embodiment
The part of detailed description, may refer to the associated description of other embodiment.
The above is only the preferred embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of the application principle is not departed from, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (10)
1. a kind of differential type electromagnetic ultrasonic transducer, it is characterised in that the differential type electromagnetic ultrasonic transducer includes magnet, extremely
Few one layer of differential type coil and package casing, wherein：
The differential type coil includes two holding wires, and two holding wires are parallel in a plane to coil multi-turn, so that
Two holding wires are obtained to be alternately arranged from inside to outside and cause that the pumping signal direction transmitted in two holding wires is identical,
Wherein, the every first end of holding wire is used to receive a pumping signal；
The second end ground connection of two holding wires.
2. differential type electromagnetic ultrasonic transducer according to claim 1, it is characterised in that the differential type electromagnetic acoustic is passed
Sensor includes differential type coil described in multilayer, and the plane residing for every layer of differential type coil is parallel to each other, every layer of difference
The pumping signal direction transmitted in formula coil is identical.
3. differential type electromagnetic ultrasonic transducer according to claim 2, it is characterised in that differential type coil bag described in multilayer
Include adjacent ground floor differential type coil and second layer differential type coil, two the second ends of the ground floor differential type coil with
Two first ends of the second layer differential type coil connect one to one.
4. differential type electromagnetic ultrasonic transducer according to claim 3, it is characterised in that at every layer of differential type coil
In in a plane of PCB, two the second ends and the second layer differential type line of the ground floor differential type coil
Two first ends of circle are connected one to one by the via in the PCB.
5. differential type electromagnetic ultrasonic transducer according to claim 1, it is characterised in that in the differential type coil two
Root holding wire is coiled into one of following shape parallel：Ring-like, cheese, racetrack, inflection type and butterfly-type.
6. a kind of electromagnetic acoustic detecting system, it is characterised in that including：
Driving source, for producing pumping signal；
Signal conditioner, is connected with the driving source, for the pumping signal to be nursed one's health as frequency is identical with amplitude and phase
Position opposite the first pumping signal and the second pumping signal；
Differential type electromagnetic ultrasonic transducer any one of claim 1 to claim 5, the differential type electromagnetic acoustic
Sensor is connected with the signal conditioner, for receiving first pumping signal and second pumping signal with mesh
Sense in mark object and produce vortex.
7. system according to claim 6, it is characterised in that the differential type electromagnetic ultrasonic transducer includes at least one of which
Differential type coil, the differential type coil includes two holding wires, and the signal conditioner is additionally operable to according to two signals
The differential signal exported in line is producing differential sense signal.
8. system according to claim 7, it is characterised in that also include：
Signal processor, is connected with the signal conditioner, for carrying out signal transacting to the differential sense signal.
9. system according to claim 8, it is characterised in that
The signal processor includes：Preamplifier, is connected with the signal conditioner, for amplifying the Differential Detection
Signal；Signal picker, is connected with the preamplifier, for gathering the differential sense signal after amplifying,
The driving source includes：Signal generator, for producing the pumping signal；Power amplifier, occurs with the signal
Device is connected with the signal conditioner, for amplifying the pumping signal.
10. system according to claim 6, it is characterised in that the waveform that the differential type electromagnetic ultrasonic transducer is produced
For it is following any one：
Shear wave, compressional wave, guided wave and surface wave.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109361379A (en) * | 2018-09-18 | 2019-02-19 | 天津大学 | A kind of electromagnetic chromatographic imaging system exciting signal source based on pulse-width modulation circuit |
| CN112763112A (en) * | 2021-01-04 | 2021-05-07 | 东北林业大学 | Rail stress measuring device and method |
| CN114216600A (en) * | 2021-12-15 | 2022-03-22 | 北京工业大学 | L based on double-folding coil electromagnetic acoustic sensorCRWave sound beam deflection regulating and controlling method |
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