CN220716568U - Multilayer matching gas medium ultrasonic transducer - Google Patents
Multilayer matching gas medium ultrasonic transducer Download PDFInfo
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- CN220716568U CN220716568U CN202322320701.0U CN202322320701U CN220716568U CN 220716568 U CN220716568 U CN 220716568U CN 202322320701 U CN202322320701 U CN 202322320701U CN 220716568 U CN220716568 U CN 220716568U
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- 239000000919 ceramic Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims description 16
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- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 3
- 239000006261 foam material Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 87
- 230000005540 biological transmission Effects 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Transducers For Ultrasonic Waves (AREA)
Abstract
The utility model provides a multilayer matching gas medium ultrasonic transducer, which is characterized by comprising the following components: piezoelectric ceramics; a conductive layer; a first matching layer; a second matching layer; the piezoelectric ceramic, the conductive layer, the first matching layer and the second matching layer are sequentially laminated, the piezoelectric ceramic has a first acoustic impedance value Z1, the first matching layer has a second acoustic impedance value Z2, and the second matching layer has a second acoustic impedance value Z3, which satisfies the following relation: z1 > Z2 > Z3, wherein the second acoustic impedance value Z3 is greater than the acoustic impedance Z4 of the air medium; z2 2 : the ratio of Z1 to Z3 ranges from 1 to 10; z3 2 : the ratio of Z2 x Z4 ranges from 1 to 10.
Description
Technical Field
The utility model relates to a multilayer matching gas medium ultrasonic transducer.
Background
Piezoelectric ultrasonic transducers utilize the piezoelectric and inverse piezoelectric properties of piezoelectric ceramics to detect certain physical properties of a medium by transmitting and receiving acoustic waves into and from the medium.
The inherent characteristic of acoustic wave propagation is that when the acoustic impedance difference between two different media is larger, the reflection coefficient is larger and the transmission coefficient is smaller. In the application of air medium, the acoustic impedance value of piezoelectric ceramics is far greater than that of air, and there is a gap of 5-6 orders of magnitude between them, so that it is generally required to use a transition layer with acoustic impedance value between them to improve the transmission efficiency of sound waves.
At present, the selection density is more than 500kg/m 3 About, the sound velocity is about 1600m/s, and the material is used as a matching layer to realize the function of gas medium sound wave propagation. However, due to the fact that the acoustic impedance of the material in the mode is 2-3 orders of magnitude different from that of the piezoelectric ceramic and the air medium, the propagation efficiency of the acoustic wave still cannot meet the use requirements under many working conditions.
The Chinese patent with the authority bulletin number of CN219038089U and the authority bulletin date of 2023.5.16 discloses an ultrasonic transducer and a gas ultrasonic flowmeter, wherein the ultrasonic transducer comprises a shell, a piezoelectric body, a backing block and a protective layer; the shell is internally provided with a containing cavity, the piezoelectric body and the backing block are both positioned in the containing cavity, the piezoelectric body comprises a piezoelectric body, a first conductive layer and a second conductive layer, the piezoelectric body is provided with a first surface and a second surface which are opposite along a first direction, the first conductive layer is positioned between the first surface and the inner bottom wall of the shell, the second conductive layer is positioned on the second surface, the protective layer is coated on the second conductive layer, and the backing block is positioned on the protective layer. The ultrasonic transducer further comprises a matching layer, wherein the matching layer is positioned on the outer bottom wall of the shell, and the matching layer is arranged opposite to the first conductive layer. That is, in the ultrasonic transducer, a single-layer matching layer is used to match acoustic impedance between the gas medium and the piezoelectric body, and the problems described above are also present.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide the multi-layer matching gas medium ultrasonic transducer with reasonable structural design.
The technical scheme adopted by the embodiment of the utility model for solving the problems is as follows: a multilayer matching gaseous medium ultrasonic transducer, comprising:
piezoelectric ceramics;
a conductive layer;
a first matching layer; and
a second matching layer;
the piezoelectric ceramic, the conductive layer, the first matching layer and the second matching layer are sequentially laminated, the piezoelectric ceramic has a first acoustic impedance value Z1, the first matching layer has a second acoustic impedance value Z2, and the second matching layer has a second acoustic impedance value Z3, which satisfies the following relation: z1 > Z2 > Z3, wherein the second acoustic impedance value Z3 is greater than the acoustic impedance Z4 of the air medium; z2 2 : the ratio of Z1 to Z3 ranges from 1 to 10; z3 2 : the ratio of Z2 x Z4 ranges from 1 to 10.
The value of example Z1 according to the utility model is 3.5 x 10 7 ～4.5*10 7 The method comprises the steps of carrying out a first treatment on the surface of the Z2 has a value of 2.5 x 10 6～ 3.5*10 6 The method comprises the steps of carrying out a first treatment on the surface of the Z3 has a value of 8 x 10 4 ～1.5*10 5 。
The material density of the first matching layer in the embodiment of the utility model is 1200kg/m 3 To 1500kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The sound velocity is 2200.+ -.200 m/s.
The material density of the second matching layer in the embodiment of the utility model is 60kg/m 3 To 80kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The sound velocity is 1600.+ -.200 m/s.
The first matching layer is made of plastic materials.
The second matching layer is made of foam materials, and the closed porosity of the second matching layer is more than 95%.
The conducting layer is made of stainless steel, and the outer edge of the conducting layer exceeds the piezoelectric ceramic.
In the embodiment of the utility model, the piezoelectric ceramic, the conductive layer, the first matching layer and the second matching layer are mutually bonded through epoxy resin.
The thickness of the first matching layer in the embodiment of the utility model is 1/4 of the wavelength.
The thickness of the second matching layer in the embodiment of the utility model is 1/4 of the wavelength.
The embodiment of the utility model further comprises a shell, wherein the piezoelectric ceramic, the conducting layer and the first matching layer are arranged in the shell, and at least a part of the second matching layer is exposed outside the shell.
Compared with the prior art, the utility model has one or more of the following advantages or effects: the structure is simple, and the design is reasonable; through the arrangement of the first matching layer and the second matching layer, the acoustic impedance of the medium from the piezoelectric ceramic to the air medium is gradually reduced, namely, the acoustic impedance of the piezoelectric ceramic, the acoustic impedance of the first matching layer and the acoustic impedance of the second matching layer are gradually reduced, so that the acoustic impedance difference value between two adjacent mediums are reduced, the transmission efficiency of sound waves can be effectively improved, and more air mediums and working conditions can be adapted.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic perspective view of a multilayer matching air medium ultrasonic transducer according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a three-dimensional structure of a multi-layer matching gas medium ultrasonic transducer in an embodiment of the utility model.
FIG. 3 is a schematic cross-sectional structural view of a multilayer matching gaseous medium ultrasonic transducer in an embodiment.
FIG. 4 is a schematic cross-sectional structural view of a multilayer matching gaseous medium ultrasonic transducer in an embodiment.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. The directions such as "axial direction", "above", "below", etc. are hereinafter for the sake of clarity of the structural positional relationship, and are not limiting of the present utility model. In the present utility model, the terms "vertical", "horizontal", "parallel" are defined as: including + -10% cases based on standard definition. For example, vertical generally refers to an included angle of 90 degrees with respect to the reference line, but in the present utility model, vertical refers to a case including 80 degrees to 100 degrees or less.
Referring to fig. 1 to 4, the multilayer matching dielectric ultrasonic transducer of the present embodiment includes a piezoelectric ceramic 5, a conductive layer 3, a first matching layer 1, a second matching layer 2, and a housing 4.
In this embodiment, the piezoelectric ceramic 5, the conductive layer 3, the first matching layer 1, and the second matching layer 2 are sequentially stacked, where the piezoelectric ceramic 5 is in the prior art, and will not be described herein again. The piezoelectric ceramic 5 has a first acoustic impedance value Z1 (in Rayl), the first matching layer 1 has a second acoustic impedance value Z2, and the second matching layer 2 has a second acoustic impedance value Z3, which satisfies the following relationship: z1 > Z2 > Z3, wherein the second acoustic impedance value Z3 is greater than the acoustic impedance Z4 of the air medium;
Z2 2 : the ratio of Z1 to Z3 ranges from 1 to 10; z3 2 : the ratio of Z2 x Z4 ranges from 1 to 10. Through the arrangement of the first matching layer 1 and the second matching layer 2, the acoustic impedance of the medium from the piezoelectric ceramic 5 to the air medium is gradually reduced, namely, the acoustic impedance of the piezoelectric ceramic 5, the acoustic impedance of the first matching layer 1 and the acoustic impedance of the second matching layer 2 are gradually reduced, so that the acoustic impedance difference between two adjacent mediums are reduced, the transmission efficiency of sound waves can be effectively improved, and more air mediums and working conditions can be adapted.
The material density of the first matching layer 1 according to this embodiment is 1200kg/m 3 To 1500kg/m 3 . Preferably, the density is 1300kg/m 3 To 1400kg/m 3 . More preferably, the density is 1350kg/m 3 . The sound velocity is 2200 + -200 m/s (the propagation velocity of sound in the first matching layer 1).
The material density of the second matching layer 2 according to this embodiment is 60kg/m 3 To 80kg/m 3 . Preferably, the material density of the second matching layer 2 is 71+ -2 kg/m 3 . The sound velocity is 1600 + -200 m/s (propagation velocity of sound in the second matching layer 2).
In this embodiment, the first matching layer 1 is made of plastic. Specifically, the PEEK is pure material, and has better isotropy property due to the adoption of the pure material, so that the performance difference caused by the difference of the internal directivity of the material can be avoided during assembly.
In this embodiment, the second matching layer 2 is made of foam, and the closed porosity is 95% or more. Specifically, the second matching layer 2 adopts PMI functional foam, which is a hard solid, isotropic, and is machinable, and the acoustic impedance value of the second matching layer is closer to that of gas.
The materials of the first matching layer 1 and the second matching layer 2 in the embodiment have good isotropic properties, the directionality of the materials is not required to be considered, and the difficulty in process implementation is reduced.
In this embodiment, the conductive layer 3 is made of stainless steel, and the outer edge of the conductive layer exceeds the piezoelectric ceramic 5, so that the electrode of the piezoelectric ceramic 5 is led out of the range of the piezoelectric ceramic 5, so as to facilitate welding. In addition, the conductive layer 3 is a stainless steel sheet, the acoustic impedance of which is close to that of the piezoelectric ceramic 5, and the ultrasonic wave can be smoothly conducted between the two.
In the embodiment of the utility model, the piezoelectric ceramic 5, the conductive layer 3, the first matching layer 1 and the second matching layer 2 are bonded by epoxy resin. The epoxy resin completely covers each contact surface and has a thickness of the order of micrometers.
The thickness of each dielectric layer is based on lambda=c/f according to the design frequency point, wherein lambda is wavelength, c is sound velocity, f is frequency, and the thickness of the dielectric layer is about lambda/4, so that the dielectric layer can be suitable for various frequency products of gas application. Specifically, the thickness of the first matching layer is about 1/4 of the wavelength; the thickness of the second matching layer is about 1/4 of the wavelength.
Referring to fig. 3, in an embodiment, when the 500kHz product is applied, the thickness of the first matching layer 1 is 1-1.2 mm, and the thickness of the second matching layer 2 is 0.7-0.9 mm. Preferably, the thickness of the first matching layer 1 is 1.1mm, and the thickness of the second matching layer 2 is 0.8mm. The thickness of the conductive layer 3 was 0.17mm.
Referring to fig. 4, in an embodiment of the 200kHz product application, the thickness of the first matching layer 1 is 2.5-3 mm and the thickness of the second matching layer 2 is 1.8-2.2 mm. Preferably, the thickness of the first matching layer 1 is 2.8mm, and the thickness of the second matching layer 2 is 2mm.
The embodiment of the utility model further comprises a housing 4, wherein the piezoelectric ceramic 5, the conductive layer 3 and the first matching layer 1 are arranged in the housing 4, and at least a part of the second matching layer 2 is exposed outside the housing 4.
The foregoing description of the utility model is merely exemplary of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the scope of the utility model as defined in the accompanying claims.
Claims (10)
1. A multilayer matching gaseous medium ultrasonic transducer, comprising:
piezoelectric ceramics;
a conductive layer;
a first matching layer; and
a second matching layer;
the piezoelectric ceramic, the conductive layer, the first matching layer and the second matching layer are sequentially laminated, the piezoelectric ceramic has a first acoustic impedance value Z1, the first matching layer has a second acoustic impedance value Z2, and the second matching layer has a second acoustic impedance value Z3, which satisfies the following relation: z1 > Z2 > Z3, wherein the second acoustic impedance value Z3 is greater than the acoustic impedance Z4 of the air medium;
Z2 2 : the ratio of Z1 to Z3 ranges from 1 to 10; z3 2 ：ZThe ratio of 2 x z4 ranges from 1 to 10.
2. The multilayer matching gaseous medium ultrasonic transducer of claim 1, wherein: the value of Z1 is 10 7 The method comprises the steps of carrying out a first treatment on the surface of the The value of Z2 is of the order of 10 5 ～10 6 The method comprises the steps of carrying out a first treatment on the surface of the The value of Z3 is 10 4 ～10 5 。
3. The multilayer matching gaseous medium ultrasonic transducer of claim 2, wherein: the material density of the first matching layer is 1200kg/m 3 To 1500kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The sound velocity is 2200.+ -.200 m/s.
4. The multilayer matching gaseous medium ultrasonic transducer of claim 2, wherein: the material density of the second matching layer is 60kg/m 3 To 100kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The sound velocity is 1600.+ -.200 m/s.
5. A multilayer matching gaseous medium ultrasonic transducer according to claim 3, characterized in that: the first matching layer is made of plastic materials.
6. The multilayer matching gaseous medium ultrasonic transducer of claim 4, wherein: the second matching layer is made of foam materials, and the closed porosity of the second matching layer is more than 95%.
7. The multilayer matching gaseous medium ultrasonic transducer of claim 1, wherein: the conducting layer is made of stainless steel, and the outer edge of the conducting layer exceeds the piezoelectric ceramic.
8. The multilayer matching gaseous medium ultrasonic transducer of claim 1, wherein: the piezoelectric ceramic, the conductive layer, the first matching layer and the second matching layer are bonded with each other through epoxy resin.
9. The multilayer matching gaseous medium ultrasonic transducer of claim 1, wherein: the thickness of the first matching layer is 1/4 of the wavelength.
10. The multilayer matching gaseous medium ultrasonic transducer of claim 1, wherein: the thickness of the second matching layer is 1/4 of the wavelength.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322320701.0U CN220716568U (en) | 2023-08-29 | 2023-08-29 | Multilayer matching gas medium ultrasonic transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322320701.0U CN220716568U (en) | 2023-08-29 | 2023-08-29 | Multilayer matching gas medium ultrasonic transducer |
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| Publication Number | Publication Date |
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| CN220716568U true CN220716568U (en) | 2024-04-05 |
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| CN202322320701.0U Active CN220716568U (en) | 2023-08-29 | 2023-08-29 | Multilayer matching gas medium ultrasonic transducer |
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- 2023-08-29 CN CN202322320701.0U patent/CN220716568U/en active Active
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