CN219850568U - Focusing air coupling ultrasonic transducer - Google Patents
Focusing air coupling ultrasonic transducer Download PDFInfo
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- CN219850568U CN219850568U CN202320863912.6U CN202320863912U CN219850568U CN 219850568 U CN219850568 U CN 219850568U CN 202320863912 U CN202320863912 U CN 202320863912U CN 219850568 U CN219850568 U CN 219850568U
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- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 239000000919 ceramic Substances 0.000 claims abstract description 68
- 239000003822 epoxy resin Substances 0.000 claims abstract description 6
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 6
- 238000002604 ultrasonography Methods 0.000 claims 5
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000000523 sample Substances 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
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- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
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- 238000007747 plating Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
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- 238000004544 sputter deposition Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 238000000016 photochemical curing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012856 packing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The utility model discloses a focusing air coupling ultrasonic transducer which sequentially comprises an upper electrode, a piezoelectric ceramic layer and a lower electrode from top to bottom, wherein the piezoelectric ceramic layer consists of a piezoelectric ceramic column array and epoxy resin filled in the piezoelectric ceramic column array, the piezoelectric ceramic column array comprises a plurality of piezoelectric ceramic columns distributed in an array, and the output ends of the piezoelectric ceramic columns point to the same center point. The focusing air coupling ultrasonic transducer provided by the utility model realizes the focusing of sound wave energy by designing the focusing array structure, greatly improves the sound wave energy density, widens the frequency band of the probe without losing sensitivity, can realize the rapid and non-contact scanning detection of multiple materials, has a simple structure, and can further change the geometric design according to the actual performance requirement to prepare probes with different specifications so as to match the quality and damage rapid scanning required by different fields.
Description
Technical Field
The utility model relates to the technical field of air-coupled ultrasonic transducers, in particular to a focusing air-coupled ultrasonic transducer.
Background
The air-coupled ultrasonic detection technology takes air as a coupling medium, is not limited by material characteristics and detection environments, can completely realize non-contact detection, and has wide application prospect in the aspect of rapid scanning.
The existing air coupling ultrasonic transducer mainly adopts piezoelectric ceramics as sensitive elements, and in the actual use process, three factors influencing the detection effect are mainly included: (1) attenuation of ultrasonic waves in air; (2) a great deal of reflection of ultrasonic waves at the gas-solid interface; (3) energy transmission efficiency of an air-coupled ultrasonic sensor. The latter two points are difficult to break through greatly due to the restriction of physical factors, and focusing ultrasonic energy greatly improves the energy density of the ultrasonic wave aiming at the attenuation problem of the ultrasonic wave in the air.
The current acoustic wave energy focusing technology mainly comprises: line focus, multi-element focus, phased array focus. The biggest disadvantages of these techniques are their complex process, more sensitivity loss in achieving focus and narrower frequency bands. In actual use, probes of various specifications often need to be replaced, rapid scanning cannot be completed, and the application prospect of the air coupling ultrasonic detection technology is limited.
Disclosure of Invention
Aiming at the problem that sound waves are attenuated in the air in a large quantity during air coupling ultrasonic detection, the utility model provides the focusing air coupling ultrasonic transducer, the focusing array structure is designed to realize the focusing of sound wave energy, the frequency band of the probe is widened without losing sensitivity while the sound wave energy density is greatly improved, the rapid non-contact scanning detection of multiple materials can be realized, the structure is simple, the geometric design can be further changed according to the actual performance requirement, and the probes with different specifications can be prepared so as to match the quality and damage required by different fields.
The technical scheme of the utility model is as follows:
the utility model provides a focusing air coupling ultrasonic transducer, includes upper electrode, piezoceramics layer and bottom electrode from top to bottom in proper order, the piezoceramics layer comprises piezoceramics post array and the epoxy of packing in the piezoceramics post array, the piezoceramics post array includes a plurality of piezoceramics post that is the array and distributes, the output of a plurality of piezoceramics post points to same central point.
Optionally, the lower surface of the piezoelectric ceramic layer is an arc surface.
Optionally, the upper and lower surfaces of the piezoelectric ceramic layer are arc surfaces.
Optionally, the array of piezoelectric ceramic posts is a circular array.
Optionally, the array of piezoelectric ceramic columns is a hexagonal array.
Optionally, the piezoelectric ceramic column is a cylinder.
Compared with the prior art, the utility model has the beneficial effects that:
1. compared with line focusing, multi-element focusing and phased array focusing, the utility model has the advantages of simple structure, simple preparation process and high yield;
2. the focusing structure of the piezoelectric ceramic column array can greatly improve the sound wave energy density at the focus;
3. through arrangement and array patterns of the piezoelectric ceramic column array, the bandwidth of-6 dB of the probe can be improved under the condition of no sensitivity loss, and the maximum bandwidth can reach 140%;
4. the utility model has adjustable various geometric parameters (such as projection radius of the piezoelectric ceramic column array, diameter and height of each piezoelectric ceramic column), and can change parameters according to actual needs, thereby covering different frequency bands to meet the requirements of receiving probes of different tests;
5. compared with the traditional flat-plate transducer, the utility model has higher test resolution precision under the same working frequency, and can rapidly scan various materials.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a focusing air-coupled ultrasonic transducer according to a first embodiment of the present utility model;
fig. 2 is a plan view of a piezoelectric ceramic column array of a focusing air-coupled ultrasonic transducer according to a first embodiment of the present utility model;
fig. 3 is a perspective view of a focusing air-coupled ultrasonic transducer according to a second embodiment of the present utility model;
fig. 4 is a plan view of a piezoelectric ceramic column array of a focusing air-coupled ultrasonic transducer according to a second embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In order to illustrate the technical scheme of the utility model, the following description is made by specific examples.
Example 1
Referring to fig. 1 and 2, the present embodiment provides a focusing air-coupled ultrasonic transducer, which includes an upper electrode 1, a piezoelectric ceramic layer 2 and a lower electrode 3 from top to bottom. The electrode material of the upper electrode 1 can be gold, silver, copper or alloy thereof, and a certain thickness is formed on the upper surface of the piezoelectric ceramic layer 2 by adopting chemical plating or vacuum sputtering and the like to collect voltage signals of the piezoelectric ceramic layer 2; the piezoelectric ceramic layer 2 is used for receiving energy of ultrasonic longitudinal waves and converting the energy into voltage signals, the piezoelectric ceramic layer 2 is composed of a piezoelectric ceramic column circular array 21 and high-performance epoxy resin 22 filled in the piezoelectric ceramic column circular array 21, the piezoelectric ceramic column circular array 21 comprises a plurality of piezoelectric ceramic columns distributed in a circular array, the lower surface of the piezoelectric ceramic layer 2 is an arc surface or the upper surface and the lower surface of the piezoelectric ceramic layer 2 are arc surfaces, the output ends of the piezoelectric ceramic columns point to the same center point, so that ultrasonic longitudinal waves emitted by each piezoelectric ceramic column are simultaneously converged to the same focus, the energy density of the acoustic waves is enhanced, the filling of the high-performance epoxy resin 22 can improve the vibration mode of a sensitive element, the working frequency band of the sensitive element is improved while the sensitivity is not lost, the preparation method is that firstly, a focal array structure green compact is prepared by utilizing SLA photo-curing 3D printing ceramic slurry, and then the focal array structure green compact is prepared, the projection radius of the piezoelectric ceramic column circular array 21, the diameter and the height of each piezoelectric ceramic column are adjustable, and parameters of each piezoelectric ceramic column can be changed according to actual requirements, so that different receiving requirements can be met; the electrode material of the lower electrode 3 can be gold, silver, copper or alloy thereof, and a certain thickness is formed on the lower surface of the piezoelectric ceramic layer 2 by adopting chemical plating or vacuum sputtering, etc. to collect the voltage signal of the piezoelectric ceramic layer 2.
Example two
Referring to fig. 3 and 4, the present embodiment provides a focusing air-coupled ultrasonic transducer, which includes an upper electrode 1, a piezoelectric ceramic layer 2 and a lower electrode 3 sequentially from top to bottom. The electrode material of the upper electrode 1 can be gold, silver, copper or alloy thereof, and a certain thickness is formed on the upper surface of the piezoelectric ceramic layer 2 by adopting chemical plating or vacuum sputtering and the like to collect voltage signals of the piezoelectric ceramic layer 2; the piezoelectric ceramic layer 2 is used for receiving energy of ultrasonic longitudinal waves and converting the energy into voltage signals, the piezoelectric ceramic layer 2 is composed of a piezoelectric ceramic column hexagonal array 23 and high-performance epoxy resin 22 filled in the piezoelectric ceramic column hexagonal array 23, the piezoelectric ceramic column hexagonal array 23 comprises a plurality of piezoelectric ceramic columns distributed in a hexagonal array, the lower surface of the piezoelectric ceramic layer 2 is an arc surface or the upper surface and the lower surface of the piezoelectric ceramic layer 2 are arc surfaces, the output ends of the piezoelectric ceramic columns point to the same center point, so that ultrasonic longitudinal waves emitted by each piezoelectric ceramic column are simultaneously converged to the same focus, the energy density of the acoustic waves is enhanced, the filling of the high-performance epoxy resin 22 can improve the vibration mode of a sensitive element, the working frequency band of the sensitive element is improved while the sensitivity is not lost, the preparation method is that firstly, a focal array structure green compact is prepared by utilizing SLA photo-curing 3D printing ceramic slurry, and then the focal array structure green compact is prepared, the projection radius of the piezoelectric ceramic column hexagonal array 23, the diameter and the height of each piezoelectric ceramic column are adjustable, and parameters of each piezoelectric ceramic column can be changed according to actual requirements, so that different receiving requirements are met; the electrode material of the lower electrode 3 can be gold, silver, copper or alloy thereof, and a certain thickness is formed on the lower surface of the piezoelectric ceramic layer 2 by adopting chemical plating or vacuum sputtering, etc. to collect the voltage signal of the piezoelectric ceramic layer 2.
The foregoing description of the preferred embodiment of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (6)
1. The utility model provides a focusing air coupling ultrasonic transducer, from last down including upper electrode, piezoceramics layer and bottom electrode in proper order, its characterized in that: the piezoelectric ceramic layer consists of a piezoelectric ceramic column array and epoxy resin filled in the piezoelectric ceramic column array, the piezoelectric ceramic column array comprises a plurality of piezoelectric ceramic columns distributed in an array, and the output ends of the piezoelectric ceramic columns point to the same center point.
2. A focused air-coupled ultrasound transducer according to claim 1, wherein: the lower surface of the piezoelectric ceramic layer is an arc-shaped surface.
3. A focused air-coupled ultrasound transducer according to claim 1, wherein: the upper surface and the lower surface of the piezoelectric ceramic layer are arc-shaped surfaces.
4. A focused air-coupled ultrasound transducer according to claim 1, wherein: the piezoelectric ceramic column array is a circular array.
5. A focused air-coupled ultrasound transducer according to claim 1, wherein: the array of piezoelectric ceramic columns is a hexagonal array.
6. A focused air-coupled ultrasound transducer according to claim 1, wherein: the piezoelectric ceramic column is a cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320863912.6U CN219850568U (en) | 2023-04-17 | 2023-04-17 | Focusing air coupling ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320863912.6U CN219850568U (en) | 2023-04-17 | 2023-04-17 | Focusing air coupling ultrasonic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219850568U true CN219850568U (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320863912.6U Active CN219850568U (en) | 2023-04-17 | 2023-04-17 | Focusing air coupling ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219850568U (en) |
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2023
- 2023-04-17 CN CN202320863912.6U patent/CN219850568U/en active Active
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