CN201261009Y - Supersonic transducer with continuously changed acoustic impedance - Google Patents
Supersonic transducer with continuously changed acoustic impedance Download PDFInfo
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- CN201261009Y CN201261009Y CNU2008201517087U CN200820151708U CN201261009Y CN 201261009 Y CN201261009 Y CN 201261009Y CN U2008201517087 U CNU2008201517087 U CN U2008201517087U CN 200820151708 U CN200820151708 U CN 200820151708U CN 201261009 Y CN201261009 Y CN 201261009Y
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- ultrasonic transducer
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Abstract
The utility model relates to an ultrasonic transducer with acoustic impedance continuous change, which comprises a back lining and a piezoelectric layer that are sequentially overlapped, wherein an acoustic impedance continuous change layer is arranged between the piezoelectric layer and working medium. The ultrasonic transducer can realize the acoustic matching among acoustic impedances by only needing one acoustic impedance continuous change layer, causes the structure of the ultrasonic transducer to be greatly simplified, does not have multiple reflection among structural layers, and improves the emission efficiency of acoustic energy.
Description
Technical field
The utility model relates to a kind of ultrasonic transducer, particularly relates to a kind of acoustic impedance continually varying ultrasonic transducer.
Background technology
Ultrasonic transducer is a kind of the signal of telecommunication to be converted to acoustical signal, sends it in the working media and goes, and will convert passive, the passive bilateral device of the signal of telecommunication through working media propagation, scattering or the acoustical signal that reflects to again then.The performance of ultrasonic transducer is the Primary Component of decision corresponding system performance.
As shown in Figure 1, the prior art ultrasonic transducer comprises piezoelectric layer 1, matching layer 2, backing 3 and acoustic lens 4, in order to make ultrasonic transducer that higher machine-electrical efficiency be arranged, ultrasonic transducer adopts the matching layer of two-layer or multilayer usually, makes the piezoelectric layer 1 of high acoustic impedance and the working media of low acoustic impedance that coupling preferably be arranged.Matching Problems in Ultrasonic Transducer layer shown in Figure 1 is two-layer, and this is very generally to adopt at present.
Even adopt the multilayer matching layer, also can have the acoustic impedance mismatch between the piezoelectric layer 1 of high acoustic impedance and the working media of low acoustic impedance.The acoustic impedance of supposing piezoelectric is Z
c, the acoustic impedance of working media is Z
m, the acoustic impedance Z of i layer matching layer
iCan be expressed as:
When i=1
When i=N
Wherein, N is total number of plies of matching layer, and γ is the reasonable numeral greater than 2, depends on the result of different theoretical experimental studies.Ultrasonic transducer with two-layer matching layer is an example, the acoustic impedance of piezoelectric ceramic piece is 32MRay1, the acoustic impedance of first matching layer (adjacent with piezoelectric layer 1) and the acoustic impedance of second matching layer by formula (1) are done calculating, be respectively 9.03 MRay1 and 2.55 MRay1 (acoustic impedance of supposition working media is 1.5 MRay1, and the γ of calculating is taken as 2).Hence one can see that, and there is the acoustic impedance mismatch in the ultrasonic transducer of two-layer matching layer between the working media of the piezoelectric layer of high acoustic impedance and low acoustic impedance.
Between second layer matching layer and acoustic lens 4, also can there be the problem of acoustic impedance mismatch, to make as acoustic lens 4 RTV silastic materials commonly used, the acoustic impedance of RTV is about 1.3 MRay1, will have Z
2=2.55 MRay1 and Z
LThe acoustic impedance mismatch of=1.3 MRay1.The sound energy reflection coefficient that causes thus is:
Corresponding sound pressure reflection coefficient is 32.5%; Corresponding sound intensity acoustical transimittivity is T=1-R=89%.That is to say that the ultrasonic transducer for two-layer matching layer commonly used can not send to the acoustic energy that has 10.5% in the working media.
The shortcoming of this ultrasonic transducer is:
If 1 adopts a spot of matching layer, adopt one to two layer of matching layer (this is the method that present most ultrasonic transducer adopts), the effect of acoustics coupling is " step " formula so, can not be fully and the acoustic impedance of working media mate.
2, the multilayer coupling can be improved the effect of acoustics coupling, but every increase one deck matching layer also increases one deck tack coat simultaneously.This has not only increased the structural complexity of ultrasonic transducer, has also caused the repeatedly reflection of sound wave in tack coat simultaneously, thereby reduces the otherwise performance of ultrasonic transducer.
3, owing to have impedance mismatching between second layer matching layer and the acoustic lens, some energy can not send in the working media, this part energy will produce repeatedly reflection between the interface of the interface of acoustic lens and working media and the acoustic lens and second matching layer, this repeatedly result of reflection causes to occur the bright dark fringe in tangible near field in the ultrasonic image-forming system.
The utility model content
The purpose of this utility model provides a kind of acoustic impedance continually varying ultrasonic transducer, and is simple in structure, makes the piezoelectric layer of high acoustic impedance and the working media of low acoustic impedance mate coupling well.
In order to achieve the above object, the technical solution of the utility model is: a kind of acoustic impedance continually varying ultrasonic transducer, the backing, the piezoelectric layer that comprise overlapping setting successively, characteristics are, are provided with the continuous change layer of acoustic impedance between described piezoelectric layer and working media.
Above-mentioned acoustic impedance continually varying ultrasonic transducer, wherein, the acoustical material particle that the continuous change layer of described acoustic impedance is identical by particle diameter, proportion is different and polymer-coupled dose are mixing cured to be constituted.
Above-mentioned acoustic impedance continually varying ultrasonic transducer, wherein, the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance is adjacent with piezoelectric layer
HEquate the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance is adjacent with working media with the acoustic impedance value of piezoelectric layer
lEquate with the acoustic impedance value of working media.
Above-mentioned acoustic impedance continually varying ultrasonic transducer wherein, adds lens jacket between continuous change layer of described acoustic impedance and working media, the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance is adjacent with piezoelectric layer
HEquate the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance is adjacent with lens jacket with the acoustic impedance value of piezoelectric layer
lEquate with the acoustic impedance value of lens jacket.
Above-mentioned acoustic impedance continually varying ultrasonic transducer wherein, also is provided with the continuous change layer of acoustic impedance between described backing and piezoelectric layer.
Above-mentioned acoustic impedance continually varying ultrasonic transducer, wherein, the acoustic impedance value on the surface that the continuous change layer of described acoustic impedance is adjacent with backing equates that with the acoustic impedance value of backing the acoustic impedance value on the surface that the continuous change layer of described acoustic impedance is adjacent with piezoelectric layer equates with the acoustic impedance value of piezoelectric layer.
Above-mentioned acoustic impedance continually varying ultrasonic transducer, wherein, the acoustic impedance of the continuous change layer of described acoustic impedance is longitudinally by acoustic impedance value Z
HTo low acoustic impedance value Z
lContinuous distributed.
The utility model makes it compared with prior art owing to adopt technique scheme, has following advantage and good effect:
1, the utility model acoustic impedance continually varying ultrasonic transducer only needs the continuous change layer of a layer impedance just can make the piezoelectric layer of high acoustic impedance and the working media of low acoustic impedance mate coupling well, therefore between piezoelectric layer and working media, needn't adopt the matching layer of sandwich construction again, also needn't introduce the tack coat between layer and the layer, can reduce the repeatedly reflection of sound wave between structure sheaf, improve the emission effciency of acoustic energy, effectively improve in the ultrasonic image-forming system near field light and shade interference stripes the influence of image quality.
2, the utility model acoustic impedance continually varying ultrasonic transducer only needs the continuous change layer of a layer impedance just can reach good acoustics matching effect, and material sandwich construction the most complicated in the ultrasonic transducer structure is greatly simplified.
3, because the acoustic impedance of the continuous change layer of acoustic impedance vertically is being continuous distributed, with high acoustics impedance Z
HEnd and low acoustic impedance Z
lEnd directly is coupled together, and realizes the not repeatedly coupling fully of reflection coupling, makes ultrasonic transducer obtain best acoustical behavior.
4, between the backing and piezoelectric layer of the utility model acoustic impedance continually varying ultrasonic transducer, the continuous change layer of acoustic impedance also can be set, can realize the coupling of coupling fully of acoustic impedance between backing and the piezoelectric layer, make from the ultrasonic wave energy of piezoelectric layer backward radiation and all advance backing, no longer reflected back piezoelectric layer thoroughly.
Description of drawings
Fig. 1 is the structural representation of ultrasonic transducer in the prior art.
Fig. 2 is the structural representation (being provided with the continuous change layer of acoustic impedance between piezoelectric layer and the acoustic lens layer) of the utility model acoustic impedance continually varying ultrasonic transducer.
Fig. 3 is the structural representation (between piezoelectric layer and the acoustic lens layer, be provided with the continuous change layer of acoustic impedance between piezoelectric layer and the back of the body village) of the utility model acoustic impedance continually varying ultrasonic transducer.
Fig. 4 is the continuous change layer internal structure of an acoustic impedance sectional view.
The specific embodiment
Below specify better embodiment of the present utility model referring to accompanying drawing:
A kind of acoustic impedance continually varying ultrasonic transducer comprises backing, the piezoelectric layer of overlapping setting successively, and characteristics are, are provided with the continuous change layer of acoustic impedance between described piezoelectric layer and working media.
The acoustical material particle that the continuous change layer of described acoustic impedance is identical by particle diameter, proportion is different and polymer-coupled dose are mixing cured to be constituted.
The acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance is adjacent with piezoelectric layer
HEquate the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance is adjacent with working media with the acoustic impedance value of piezoelectric layer
lEquate with the acoustic impedance value of working media.
Embodiment one,
In the present embodiment, ultrasonic transducer does not directly contact with working media, adds a lens jacket.
Referring to Fig. 2, a kind of acoustic impedance continually varying ultrasonic transducer comprises the continuous change layer 5 of backing 3, piezoelectric layer 1, acoustic impedance and the lens jacket 4 of overlapping setting successively.
The acoustical material particle that the continuous change layer 5 of described acoustic impedance is identical by particle diameter, proportion is different and polymer-coupled dose are mixing cured to be constituted.
The acoustical material particle that particle diameter is identical, proportion is different with after polymer-coupled dose is mixed under the effect of gravity, particle is pressed the proportion size, vertically arranges successively from large to small.Referring to Fig. 4, in the continuous change layer 5 of the acoustic impedance that forms after curing, the high acoustic impedance materials particle is positioned at the lower end of the continuous change layer 5 of acoustic impedance, and the low acoustic impedance material particle is positioned at the upper end of the continuous change layer 5 of acoustic impedance.The acoustic impedance value is Z
HMaterial granule be positioned at the lowermost end of the continuous change layer 5 of acoustic impedance (the acoustic impedance value be Z
HThe proportion maximum of material granule), the acoustic impedance value is Z
lMaterial granule be positioned at the top of the continuous change layer 5 of acoustic impedance (the acoustic impedance value be Z
lThe proportion minimum of material granule).
The acoustic impedance of the continuous change layer of described acoustic impedance is longitudinally by acoustic impedance value Z
HTo low acoustic impedance value Z
lContinuous distributed.
Described piezoelectric layer 1 can be selected piezo-electric crystal for use, as quartzy, Rochelle salt crystal, perhaps lead magnesio-niobate-the lead titanates of various different components (PMN-PT), the lead zinc niobate-lead titanates (monocrystalline piezoelectric material of PZN-PT), also can select piezoelectric ceramics for use, as barium titanate, lead titanates or various different component lead zirconate titanate (PZT) piezoceramics layer.
The continuous change layer 5 of acoustic impedance is set between described piezoelectric layer 1 and lens jacket 4, only need one deck, just can realize the acoustic matching between the different acoustic impedances, material sandwich construction the most complicated in the ultrasonic transducer structure is greatly simplified, reduced the repeatedly reflection of sound wave between structure sheaf, improved the emission effciency of acoustic energy, effectively improved in the ultrasonic image-forming system near field light and shade interference stripes the influence of image quality.
Embodiment two:
Referring to Fig. 3, embodiment two is with the difference of embodiment one, the continuous change layer of acoustic impedance also is set between described backing 3 and piezoelectric layer 1, the acoustic impedance value on the surface that the continuous change layer of this acoustic impedance and backing 3 are adjacent equates with the acoustic impedance value of backing 3, and the acoustic impedance value on the adjacent surface of the continuous change layer of acoustic impedance and piezoelectric layer 1 equates with the acoustic impedance value of piezoelectric layer 1.Similarly, the acoustic impedance of the continuous change layer of this acoustic impedance is continuous distributed longitudinally, and the preparation method of the continuous change layer 5 of acoustic impedance between the preparation method of the continuous change layer of this acoustic impedance and piezoelectric layer 1 and the lens jacket 4 is identical.
Between the backing of ultrasonic transducer and piezoelectric layer, the continuous change layer of acoustic impedance is set, can realizes the coupling of coupling fully of acoustic impedance between backing and the piezoelectric layer, make from the ultrasonic wave energy of piezoelectric layer backward radiation and all advance backing, no longer reflected back piezoelectric layer thoroughly.
Claims (6)
1, a kind of acoustic impedance continually varying ultrasonic transducer comprises it is characterized in that backing (3), the piezoelectric layer (1) of overlapping setting successively, is provided with the continuous change layer of acoustic impedance (5) between described piezoelectric layer (1) and working media.
2, acoustic impedance continually varying ultrasonic transducer as claimed in claim 1 is characterized in that, the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance (5) is adjacent with piezoelectric layer (1)
HEquate the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance (5) is adjacent with working media with the acoustic impedance value of piezoelectric layer (1)
lEquate with the acoustic impedance value of working media.
3, acoustic impedance continually varying ultrasonic transducer as claimed in claim 1, it is characterized in that, between continuous change layer of described acoustic impedance (5) and working media, add lens jacket (4), the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance (5) is adjacent with piezoelectric layer (1)
HEquate the acoustic impedance value Z on the surface that the continuous change layer of described acoustic impedance (5) is adjacent with lens jacket (4) with the acoustic impedance value of piezoelectric layer (1)
lEquate with the acoustic impedance value of lens jacket (4).
4, as claim 1 or 3 described acoustic impedance continually varying ultrasonic transducers, it is characterized in that, between described backing (3) and piezoelectric layer (1), the continuous change layer of acoustic impedance is set also.
5, acoustic impedance continually varying ultrasonic transducer as claimed in claim 4, it is characterized in that, the acoustic impedance value on the surface that the continuous change layer of described acoustic impedance is adjacent with backing (3) equates that with the acoustic impedance value of backing (3) the acoustic impedance value on the surface that the continuous change layer of described acoustic impedance is adjacent with piezoelectric layer (1) equates with the acoustic impedance value of piezoelectric layer (1).
6, as claim 1 or 5 described acoustic impedance continually varying ultrasonic transducers, it is characterized in that the acoustic impedance of the continuous change layer of described acoustic impedance is longitudinally by acoustic impedance value Z
HTo low acoustic impedance value Z
lContinuous distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201517087U CN201261009Y (en) | 2008-08-07 | 2008-08-07 | Supersonic transducer with continuously changed acoustic impedance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201517087U CN201261009Y (en) | 2008-08-07 | 2008-08-07 | Supersonic transducer with continuously changed acoustic impedance |
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| CN201261009Y true CN201261009Y (en) | 2009-06-24 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102770078A (en) * | 2010-02-26 | 2012-11-07 | 株式会社日立医疗器械 | Ultrasonic probe and ultrasonic image pickup device using same |
| CN101605288B (en) * | 2008-06-13 | 2013-06-12 | 上海爱培克电子科技有限公司 | Ultrasonic energy transducer with continuously changed acoustic impedances |
| CN104226576A (en) * | 2013-06-18 | 2014-12-24 | 柯宜京 | Back lining structural system for thickness mode vibration ultrasonic transducer |
| CN105769239A (en) * | 2015-01-12 | 2016-07-20 | 三星麦迪森株式会社 | Matching Member And Ultrasound Probe Including The Same |
| CN106124618A (en) * | 2016-06-21 | 2016-11-16 | 济南大学 | A kind of sonac for cement concrete hydration reaction monitoring the process |
| CN109246575A (en) * | 2018-08-09 | 2019-01-18 | 广州联声电子科技有限公司 | A kind of preparation method of the progressive acoustic impedance matching layer of high frequency |
| CN110680390A (en) * | 2019-10-25 | 2020-01-14 | 飞依诺科技(苏州)有限公司 | Ultrasonic transducer and preparation method thereof |
| CN112657817A (en) * | 2020-11-20 | 2021-04-16 | 深圳先进技术研究院 | Array type ultrasonic transducer and manufacturing method thereof |
-
2008
- 2008-08-07 CN CNU2008201517087U patent/CN201261009Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605288B (en) * | 2008-06-13 | 2013-06-12 | 上海爱培克电子科技有限公司 | Ultrasonic energy transducer with continuously changed acoustic impedances |
| CN102770078A (en) * | 2010-02-26 | 2012-11-07 | 株式会社日立医疗器械 | Ultrasonic probe and ultrasonic image pickup device using same |
| US9138203B2 (en) | 2010-02-26 | 2015-09-22 | Hitachi Medical Corporation | Ultrasonic probe and ultrasonic imaging apparatus using the same |
| CN104226576A (en) * | 2013-06-18 | 2014-12-24 | 柯宜京 | Back lining structural system for thickness mode vibration ultrasonic transducer |
| CN105769239A (en) * | 2015-01-12 | 2016-07-20 | 三星麦迪森株式会社 | Matching Member And Ultrasound Probe Including The Same |
| CN106124618A (en) * | 2016-06-21 | 2016-11-16 | 济南大学 | A kind of sonac for cement concrete hydration reaction monitoring the process |
| CN106124618B (en) * | 2016-06-21 | 2018-10-02 | 济南大学 | A kind of sonac for cement concrete hydration reaction monitoring the process |
| CN109246575A (en) * | 2018-08-09 | 2019-01-18 | 广州联声电子科技有限公司 | A kind of preparation method of the progressive acoustic impedance matching layer of high frequency |
| CN109246575B (en) * | 2018-08-09 | 2020-10-16 | 广州联声电子科技有限公司 | Preparation method of high-frequency progressive acoustic impedance matching layer |
| CN110680390A (en) * | 2019-10-25 | 2020-01-14 | 飞依诺科技(苏州)有限公司 | Ultrasonic transducer and preparation method thereof |
| CN112657817A (en) * | 2020-11-20 | 2021-04-16 | 深圳先进技术研究院 | Array type ultrasonic transducer and manufacturing method thereof |
| CN112657817B (en) * | 2020-11-20 | 2022-03-04 | 深圳皓影医疗科技有限公司 | Array type ultrasonic transducer and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 5, building No. 3000, East long avenue, Shanghai, 201203, China Patentee after: PHILPS ultrasonic (Shanghai) Co., Ltd. Address before: Room 5, building No. 3000, East long avenue, Shanghai, 201203, China Patentee before: Shanghai Apex Electronics Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090624 |
|
| CX01 | Expiry of patent term |