CN214864994U - Ultrasonic transducer - Google Patents
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- CN214864994U CN214864994U CN202120780162.7U CN202120780162U CN214864994U CN 214864994 U CN214864994 U CN 214864994U CN 202120780162 U CN202120780162 U CN 202120780162U CN 214864994 U CN214864994 U CN 214864994U
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- 230000005855 radiation Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 210000000080 chela (arthropods) Anatomy 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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Abstract
The utility model provides an ultrasonic transducer, include: the piezoelectric layer comprises two radiation surfaces, and the piezoelectric layer can simultaneously emit ultrasonic waves in the directions of the two radiation surfaces when receiving an electric signal; a matching layer connected to one of the radiating surfaces; backing the platform, backing a side of platform with another of piezoelectric layer the radiating surface is connected, backing the platform along keeping away from the direction of piezoelectric layer is the throat form, the utility model discloses a transducer is compared in traditional transducer bandwidth higher, and sensitivity is stronger, when having original function, has reduced product thickness.
Description
Technical Field
The utility model relates to an ultrasonic detection field, in particular to ultrasonic transducer.
Background
The ultrasonic transducer is a device for realizing the interconversion between the acoustic energy and the electric energy. The transducer used to generate the sound wave is called a generator. When the transducer is in a transmitting state, the electric energy is converted into mechanical energy and then into sound energy. The transducer used to receive the sound wave is called a receiver. When the transducer is in a receiving state, acoustic energy is converted into mechanical energy and then into electrical energy. Typically, the transducer can be used for both transmission and reception. The utility model relates to an ultrasonic transducer closes the replacement energy ware for receiving and dispatching. The transducer with high sensitivity, high efficiency, small size, high power and wide frequency band is the current development direction.
In the field of acoustic logging, the frequency of a commonly used ultrasonic transducer is 200-1MHz, the conventional thickness direction vibration ultrasonic transducer is formed by sequentially laminating a backing, a piezoelectric plate and a matching layer, the vibration mode of the ultrasonic transducer is half wavelength vibration, but in a lower frequency band, the conventional transducer has the problems of low sensitivity and low bandwidth, and cannot meet the requirement of high resolution of nondestructive testing.
The problem of low bandwidth is solved in the field of industrial ultrasound, and a matching layer technology is often adopted. The matching layer technology is to paste one or more layers of matching layer materials with certain characteristic impedance on the radiation surface of the transducer, and the bandwidth is widened mainly by generating double resonance or multi-resonance. In addition, the impedance of the radiation surface of the transducer can be matched with the acoustic impedance of an external medium, transmission of acoustic energy is facilitated, and therefore the effect of widening the bandwidth is achieved, but the problem of low sensitivity cannot be solved, the bandwidth widening effect is limited, on the other hand, the traditional backing needs to be increased in thickness to guarantee the sound absorption effect, the size of the ultrasonic transducer is increased, and the use convenience of the ultrasonic transducer is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ultrasonic transducer to solve the technical problem among the prior art.
In order to achieve the above object, the present invention provides the following technical solutions: an ultrasonic transducer comprising: the piezoelectric layer comprises two radiation surfaces, and the piezoelectric layer can simultaneously emit ultrasonic waves in the directions of the two radiation surfaces when receiving an electric signal; a matching layer connected to one of the radiating surfaces; a backing table connected on one side to the other of the radiating surfaces of the piezoelectric layer, the backing table being necked away from the piezoelectric layer.
Further, a clamping backing layer is arranged between the backing table and the piezoelectric layer, and the clamping backing layer can prevent the piezoelectric layer from emitting ultrasonic waves towards the clamping backing layer.
Further, the backing table is a circular table, and the shape of the longitudinal section of the circular table is an isosceles trapezoid.
Further, a vibration mode of the piezoelectric layer in the thickness direction is a quarter of the wavelength of the ultrasonic wave.
Furthermore, the composition material of the piezoelectric layer is a piezoelectric ceramic material, a piezoelectric single crystal material or a piezoelectric ceramic composite material.
Furthermore, the number of the matching layers is multiple, the multiple matching layers are sequentially connected in an overlapping mode and then connected with one radiation surface of the piezoelectric layer, and the acoustic impedance of the matching layers is gradually reduced along the direction far away from the piezoelectric layer.
Further, the cross-section of the piezoelectric layer, the cross-section of the clamping backing layer, and the cross-section of the matching layer are all the same shape.
Further, the clamping backing layer is made of tungsten or tungsten carbide.
Further, the acoustic impedance of the clamping backing layer is greater than the acoustic impedance of the piezoelectric layer.
Furthermore, the included angle of the extension lines of the two sides of the isosceles trapezoid is 50-70 degrees.
The analysis can know, the utility model discloses an ultrasonic transducer, this transducer compare in traditional transducer bandwidth higher, and sensitivity is stronger, when having original function, has reduced product thickness.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic cross-sectional view of an ultrasonic transducer according to an embodiment of the present invention.
Description of reference numerals: 1-a backing table; 2-clamping a back lining layer; 3-a piezoelectric layer; 4-matching layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; can be directly connected or indirectly connected through intermediate components; the specific meaning of the above terms can be understood by those of ordinary skill in the art as appropriate.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," "third," and "fourth" may be used interchangeably to distinguish one component from another and are not intended to denote the position or importance of the individual components.
As shown in fig. 1, according to an embodiment of the present invention, there is provided an ultrasonic transducer including: the ultrasonic wave generator comprises a piezoelectric layer 3, a matching layer 4 and a backing table 1, wherein the piezoelectric layer 3 comprises two radiation surfaces, in the figure 1, the upper surface and the lower surface of the piezoelectric layer, and the piezoelectric layer 3 can simultaneously emit ultrasonic waves in the directions of the two radiation surfaces when receiving an electric signal; the matching layer 4 is connected with a radiation surface; one side surface of the backing table 1 is connected to the other radiation surface of the piezoelectric layer 3, and the backing table 1 is in a shape of a throat in a direction away from the piezoelectric layer 3, that is, the cross-sectional area of the backing table gradually decreases in a direction away from the piezoelectric layer, in other words, the width of the backing table in the left-right direction gradually decreases in a direction away from the piezoelectric layer in fig. 1.
Preferably, still including pincers backing layer 2, pincers backing layer 2 is located between backing platform 1 and piezoelectric layer 3, pincers backing layer 2 can prevent that piezoelectric layer 3 from sending the ultrasonic wave to pincers backing layer 2 direction, pincers backing layer 2 links together with piezoelectric layer 3, pincers backing layer 2's existence makes the back of piezoelectric layer 3 establish pincers limit condition, because pincers backing layer comprises materials such as tungsten carbide, make this one side unable vibrations of piezoelectric layer 3 and pincers backing layer 2 contact, therefore, pincers backing layer 2 can prevent that piezoelectric layer 3 from sending the ultrasonic wave to pincers backing layer 2 direction, make the ultrasonic wave only propagate to one direction, concentrate the energy that original piezoelectric layer 3 released to two directions to one direction. The acoustic impedance of the clamping backing layer 2 is greater than the acoustic impedance of the piezoelectric layer 3, e.g., the acoustic impedance of the clamping backing layer 2 is greater than twice the acoustic impedance of the piezoelectric layer 3.
Preferably, the backing table 1 is a circular table, the circular table comprises a first bottom surface and a second bottom surface, the first bottom surface is connected with the clamped backing layer 2, the area of the first bottom surface is larger than that of the second bottom surface, because the backing table 1 is a circular table, and the bottom surface with larger volume of the backing table is connected with the clamped backing layer 2, the cross-sectional area of the backing table 1 is gradually reduced from the clamped backing layer 2, so that the backing table 1 forms an inclined surface, the backing table 1 mainly plays a role of sound absorption, when sound waves meet the inclined interface of the backing table 1, the sound waves are scattered, so that the sound waves are reflected multiple times in the backing table 1, the propagation direction of the sound waves after being reflected is disordered, the propagation path of the sound waves is lengthened, sound energy can be better consumed, a good sound absorption effect is obtained, the traditional backing is cylindrical, when the sound is transmitted to the bottom surface of the backing table, the sound can be directly reflected back into the piezoelectric layer, the sound absorption effect is not added, so the traditional backing table needs to be added with extra length to meet the sound absorption performance, and the thickness of the backing table 1 is obviously reduced while the sound absorption effect is ensured by the backing table 1.
Preferably, the axial section of the backing stage is an isosceles trapezoid, and the angle α between the extensions of the two legs of the isosceles trapezoid is 50 degrees to 70 degrees, such as 50 degrees, 55 degrees, 60 degrees, 65 degrees, and 70 degrees, preferably 60 degrees, and in practical use, if the cross-sectional shape of the piezoelectric layer 3 is not circular, the shape of the backing stage 1 can be changed according to the cross-sectional shape of the piezoelectric layer 3 during manufacturing, so as to ensure that the shape of the connecting surface of the backing stage 1 and the clamped backing layer 2 is the same as the cross-sectional shape of the piezoelectric layer 3.
Preferably, the vibration mode of the piezoelectric layer in the thickness direction in the conventional ultrasonic transducer is a half wavelength of the ultrasonic wave, and the vibration mode of the piezoelectric layer 3 in the thickness direction in the present ultrasonic transducer is a quarter wavelength of the ultrasonic wave, so that the piezoelectric layer 3 of the present ultrasonic transducer can significantly improve the bandwidth of the ultrasonic transducer, and under the same operating frequency of the ultrasonic transducer and the maximum frequency of the energy conversion of the ultrasonic transducer, the thickness of the piezoelectric layer 3 of the present ultrasonic transducer is only half of that of the conventional piezoelectric layer, so that the impedance is smaller, and the sensitivity is higher.
Preferably, the composition material of the piezoelectric layer 3 is one of a piezoelectric ceramic material, a piezoelectric single crystal material, and a piezoelectric ceramic composite material.
Preferably, in some working cases, the number of the matching layers 4 is multiple, the multiple matching layers 4 are sequentially stacked and connected and then connected with one radiation surface of the piezoelectric layer 3, the acoustic impedance of the matching layers 4 decreases step by step along the direction away from the piezoelectric layer 3, the number of the matching layers 4 is preferably 2 or 3, the matching layers 4 affect the bandwidth and the sound transmission efficiency of the transducer, and the more the matching layers 4, the larger the bandwidth, the higher the sound transmission efficiency; the acoustic impedance of the piezoelectric layer 3 is 33Mrayl, a common load such as water, the acoustic impedance is 1.5Mrayl, the acoustic impedance is severely mismatched, sound is difficult to transmit into water, and the matching layer 4 is required to be transitioned, for example, if the matching layer 4 has only 1 layer, the acoustic impedance of the matching layer 4 is 3Mrayl, if the matching layer 4 has two layers, the acoustic impedance of the first layer is 7Mrayl, the acoustic impedance of the second layer is 3Mrayl, if the matching layer 4 has three layers, the acoustic impedance of the first layer is 9Mrayl, the acoustic impedance of the second layer is 4.5Mrayl, the acoustic impedance of the third layer is 1.8Mrayl, and the acoustic impedance of the piezoelectric layer 4 is between 3 and the load.
Preferably, the cross-section of the piezoelectric layer 3, the cross-section of the clamping backing layer 2 and the cross-section of the matching layer 4 are all the same shape.
Preferably, the clamping backing layer 2 is made of a high acoustic impedance material, the acoustic impedance of the clamping backing layer 2 can reach 100 megarayls, and the material of the clamping backing layer 2 is preferably one of tungsten or tungsten carbide, and can be other high acoustic impedance materials.
Preferably, the backing table 1 is made of epoxy resin and tungsten powder, but may be other materials capable of playing a sound absorption role.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ultrasonic transducer, comprising:
the piezoelectric layer comprises two radiation surfaces, and the piezoelectric layer can simultaneously emit ultrasonic waves in the directions of the two radiation surfaces when receiving an electric signal;
a matching layer connected to one of the radiating surfaces;
a backing table connected on one side to the other of the radiating surfaces of the piezoelectric layer, the backing table being necked away from the piezoelectric layer.
2. The ultrasonic transducer of claim 1, further comprising: the clamping backing layer is arranged between the backing table and the piezoelectric layer and can prevent the piezoelectric layer from emitting ultrasonic waves in the direction of the clamping backing layer.
3. The ultrasonic transducer of claim 1, wherein the backing table is a circular table, and a longitudinal cross-section of the circular table has an isosceles trapezoid shape.
4. An ultrasonic transducer according to claim 1, wherein the mode of vibration of the piezoelectric layer in the thickness direction is a quarter of the wavelength of the ultrasonic wave.
5. The ultrasonic transducer of claim 1, wherein the piezoelectric layer is made of a piezoelectric ceramic material, a piezoelectric single crystal material or a piezoelectric ceramic composite material.
6. The ultrasonic transducer according to claim 1, wherein the number of said matching layers is plural, a plurality of said matching layers are sequentially stacked and connected to one said radiation surface of said piezoelectric layer, and the acoustic impedance of said matching layers decreases stepwise in a direction away from said piezoelectric layer.
7. The ultrasonic transducer of claim 2, wherein the piezoelectric layer cross-section, the clamping backing layer cross-section, and the matching layer cross-section are all the same shape.
8. The ultrasonic transducer of claim 2, wherein the clamping backing layer is tungsten or tungsten carbide.
9. The ultrasonic transducer of claim 2, wherein the acoustic impedance of the clamping backing layer is greater than the acoustic impedance of the piezoelectric layer.
10. An ultrasonic transducer according to claim 3, wherein the angle between the extensions of the two legs of the isosceles trapezoid is 50 degrees to 70 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120780162.7U CN214864994U (en) | 2021-04-15 | 2021-04-15 | Ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120780162.7U CN214864994U (en) | 2021-04-15 | 2021-04-15 | Ultrasonic transducer |
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| Publication Number | Publication Date |
|---|---|
| CN214864994U true CN214864994U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120780162.7U Active CN214864994U (en) | 2021-04-15 | 2021-04-15 | Ultrasonic transducer |
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| CN (1) | CN214864994U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112974202A (en) * | 2021-04-15 | 2021-06-18 | 上海思陶电子科技有限公司 | Ultrasonic transducer |
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- 2021-04-15 CN CN202120780162.7U patent/CN214864994U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112974202A (en) * | 2021-04-15 | 2021-06-18 | 上海思陶电子科技有限公司 | Ultrasonic transducer |
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Effective date of registration: 20220629 Address after: 222047 No. 425-43, comprehensive bonded zone, Lianyungang Economic and Technological Development Zone, China (Jiangsu) pilot Free Trade Zone, Lianyungang City, Jiangsu Province Patentee after: Lianyungang Haiwei Photoelectric Technology Co.,Ltd. Address before: No. 10, Lane 255, Xiaotang Road, Fengxian District, Shanghai, 2010 Patentee before: Shanghai Sitao Electronic Technology Co.,Ltd. |