CN117310669B - Manufacturing method of matching layer of underwater acoustic transducer - Google Patents
Manufacturing method of matching layer of underwater acoustic transducer Download PDFInfo
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- CN117310669B CN117310669B CN202311468635.XA CN202311468635A CN117310669B CN 117310669 B CN117310669 B CN 117310669B CN 202311468635 A CN202311468635 A CN 202311468635A CN 117310669 B CN117310669 B CN 117310669B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 140
- 239000010410 layer Substances 0.000 claims description 233
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000002356 single layer Substances 0.000 claims description 10
- 238000002788 crimping Methods 0.000 claims description 9
- 239000002985 plastic film Substances 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 4
- 239000007799 cork Substances 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 description 10
- 238000003475 lamination Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- -1 veneer Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention belongs to the technical field of underwater acoustic transducers for sonar, and relates to a manufacturing method of a matching layer of an underwater acoustic transducer, which comprises the following steps: 1) Alternately stacking low acoustic impedance material layers (1) and high acoustic impedance material layers (2); 2) The alternately overlapped low acoustic impedance material layers (1) and high acoustic impedance material layers (2) are pressed together to form a matching layer; wherein, according to the ideal acoustic impedance of the matching layerA duty ratio of the low acoustic impedance material layer (1) and a duty ratio of the high acoustic impedance material layer (2) in the matching layer are determined. The matching layer manufactured by the manufacturing method still belongs to a single matching layer, the matching theory is still a single matching layer theory, and the material selection range of the matching layer is widened, so that some materials which cannot be applied to the matching layer conventionally can be used for manufacturing the matching layer.
Description
Technical Field
The invention belongs to the technical field of underwater acoustic transducers for sonar, and relates to a manufacturing method of a matching layer of an underwater acoustic transducer.
Background
The structure of an underwater acoustic transducer is generally shown in fig. 1 and includes a backing 1, a piezoelectric ceramic 2, a matching layer 3 and an acoustic transmitting layer 4. Wherein, the matching layer 3 is positioned between the piezoelectric ceramic 2 and the sound transmission layer 4 and is used for playing the roles of acoustic impedance conversion and sound transmission.
The matching layer of the transducer has great influence on the performance of the transducer, the matching layer is generally made of the same material at the present stage, or glue (epoxy resin, polyurethane and the like) is adopted to mix other powder (tungsten powder, alumina powder, glass microsphere powder and the like) according to a specific ratio, and then the specific acoustic impedance is obtained.
However, the matching layer is made of a single material, so that the acoustic impedance is single and cannot be close to the required ideal acoustic impedance. In order to realize more ideal acoustic impedance, a multi-layer matching theory is introduced, which can certainly increase the difficulty of the manufacturing process, and the insertion loss is introduced every time one more matching layer is added.
The matching layer manufactured by the glue mixed powder has the problems that the material mixing of the matching layer is uneven, the internal bubbles cannot be removed cleanly, the manufactured matching layer has uneven acoustic impedance distribution, and the like.
Therefore, in order to overcome the above-mentioned drawbacks of the prior art, a new method for manufacturing a matching layer of an underwater acoustic transducer needs to be developed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a manufacturing method of a matching layer of an underwater acoustic transducer, which uses two materials to manufacture the matching layer, wherein the acoustic impedance of one material is lower than the ideal acoustic impedance of the matching layer, and the acoustic impedance of the other material is higher than the ideal acoustic impedance of the matching layer, and the acoustic impedance of the manufactured matching layer is close to the ideal acoustic impedance of the matching layer by adjusting the duty ratio coefficient and uniformly dividing the lamination of the two materials.
In order to achieve the above object, the present invention provides the following technical solutions:
The manufacturing method of the matching layer of the underwater acoustic transducer is characterized by comprising the following steps of:
1) Alternately stacking layers of low acoustic impedance material and layers of high acoustic impedance material;
2) Crimping the alternately stacked low acoustic impedance material layers and high acoustic impedance material layers together to form a matching layer;
wherein, according to the ideal acoustic impedance of the matching layer And determining the duty ratio coefficient of the low acoustic impedance material layer and the duty ratio coefficient of the high acoustic impedance material layer in the matching layer.
Preferably, according to the desired acoustic impedance of the matching layerThe duty ratio of the low acoustic impedance material layer and the duty ratio of the high acoustic impedance material layer in the matching layer are determined by:
in the method, in the process of the invention, Is the density of the low acoustic impedance material layer,Is the duty cycle of the low acoustic impedance material layer in the matching layer,Is the Young's modulus of the low acoustic impedance material layer; is the density of the layer of high acoustic impedance material, Is the duty cycle of the high acoustic impedance material layer in the matching layer,Is the Young's modulus of the high acoustic impedance material layer; Is the density of the matching layer and, Is the speed of sound of the matching layer,Is the ideal acoustic impedance of the matching layer; And The sum of (2) is 1.
Preferably, the alternately stacked layers of low acoustic impedance material and high acoustic impedance material are uniformly and symmetrically distributed with respect to the center of the thickness of the matching layer.
Preferably, the thickness of a single layer of the low acoustic impedance material layer is greater than the thickness of a single layer of the high acoustic impedance material layer.
Preferably, the thickness of the single layer of the low acoustic impedance material layer is less than or equal to 1mm, and the thickness of the single layer of the high acoustic impedance material layer is less than or equal to 0.5mm.
Preferably, glue is provided between adjacent layers of low acoustic impedance material and high acoustic impedance material.
Preferably, a large tonnage press is used for crimping and/or high Wen Yajie when alternating layers of low acoustic impedance material and high acoustic impedance material are crimped together.
Preferably, the low acoustic impedance material layer is a plastic film, a plastic sheet, a veneer, a cork or a tissue; the high acoustic impedance material layer is a metal film, a metal sheet, an electroplated metal film or an electroplated metal sheet.
Preferably, the matching layer is made of a flexible matching layer.
Preferably, the matching layer is made to have a planar shape, an arc shape, a wave shape or an irregular shape.
Compared with the prior art, the manufacturing method of the matching layer of the underwater acoustic transducer has one or more of the following beneficial technical effects:
1. the acoustic impedance of the matching layer manufactured by the invention is close to ideal acoustic impedance, and the performance of the transducer can be fully improved; meanwhile, the manufacturing method of the invention can dynamically adjust the acoustic attenuation coefficient of the matching layer according to the frequency of the transducer.
2. The manufacturing process is mature and reliable, the selection range of materials for manufacturing the matching layer is enlarged, and the problem that some conventional materials cannot be used for manufacturing the matching layer is solved.
3. The acoustic impedance consistency of each point of the matching layer manufactured by the invention is high.
4. The matching layer manufactured by the invention can realize the functions of electric connection, metal shielding and the like, and can manufacture a flexible matching layer, thereby meeting the manufacturing requirements of transducers with special shapes and special functions.
Drawings
Fig. 1 is a schematic structural view of a conventional underwater acoustic transducer.
Fig. 2 is a schematic structural diagram of a matching layer of an underwater acoustic transducer made in accordance with the present invention.
Fig. 3 is a schematic diagram of the theoretical acoustic impedance of the matching layer of an underwater acoustic transducer made in accordance with the present invention.
Fig. 4 is a schematic representation of the actual acoustic impedance of the matching layer of an underwater acoustic transducer made in accordance with the present invention.
Fig. 5 is a schematic representation of the actual acoustic impedance of a matching layer of another underwater acoustic transducer made in accordance with the present invention.
Fig. 6 is a schematic representation of the propagation of sound waves in a matching layer of an underwater acoustic transducer made in accordance with the present invention.
Fig. 7 is a schematic structural diagram of a matching layer of another underwater acoustic transducer made in accordance with the present invention.
Detailed Description
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including" or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms "mounted," "connected," "supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Furthermore, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.
Also, in the present disclosure, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus the above terms should not be construed as limiting the present disclosure; in a second aspect, the terms "a" and "an" should be understood as "at least one" or "one or more", i.e. in one embodiment the number of one element may be one, while in another embodiment the number of the element may be plural, the term "a" should not be construed as limiting the number.
The method for manufacturing the matching layer of the underwater acoustic transducer uses two different material layers to manufacture the matching layer. The desired acoustic impedance required for the matching layer of the transducer to be fabricated is known, and one of the two material layers used to fabricate the matching layer is a high acoustic impedance material layer and the other is a low acoustic impedance material layer can be determined as compared to the desired acoustic impedance.
Wherein the low acoustic impedance material layer may include: various plastic films, plastic sheets, veneer, cork, tissue, etc. The high acoustic impedance material layer may include: metal films, metal sheets, plated metal films, plated metal sheets, etc., and other films, sheets, etc., of high density.
In the present invention, when the matching layer of the underwater acoustic transducer is manufactured, as shown in fig. 2, first, the low acoustic impedance material layer 1 and the high acoustic impedance material layer 2 are alternately stacked. That is, a plurality of the low acoustic impedance material layers 1 and a plurality of the high acoustic impedance layers 2 may be alternately stacked together. In fig. 2, there are three layers of the low acoustic impedance material layer 1 and four layers of the high acoustic impedance material layer 2. Of course, the number of layers of the low acoustic impedance material layer 1 and the high acoustic impedance material layer 2 is not limited to the number shown in fig. 2.
Then, the alternately stacked low acoustic impedance material layers 1 and high acoustic impedance material layers 2 are crimped together to form a matching layer.
To enable the fabricated matching layer to have a desired acoustic impedance, one of the cores of the fabrication method of the present invention should be to adjust the duty ratio of the low acoustic impedance material layer 1 and the high acoustic impedance material layer 2 so that the acoustic impedance of the fabricated matching layer approaches the desired acoustic impedance.
In the present invention, the acoustic impedance of the matching layer can be determined according to the desired acoustic impedanceThe duty ratio of the low acoustic impedance material layer 1 and the duty ratio of the high acoustic impedance material layer 2 in the matching layer are determined as follows:
in the method, in the process of the invention, Is the density of the low acoustic impedance material layer,Is the duty cycle of the low acoustic impedance material layer in the matching layer,Is the Young's modulus of the low acoustic impedance material layer; is the density of the layer of high acoustic impedance material, Is the duty cycle of the high acoustic impedance material layer in the matching layer,Is the Young's modulus of the high acoustic impedance material layer; Is the density of the matching layer and, Is the speed of sound of the matching layer,Is the ideal acoustic impedance of the matching layer; And The sum of (2) is 1.
Wherein the ideal acoustic impedance of the matching layer can be determined according to design parameters of the underwater acoustic transducer. Also, in the case where the low acoustic impedance material layer and the high acoustic impedance material layer are selected,、、、Are also known parameters. At the same time due toAndThe sum of (2) is 1. Thus, in the above formula, there is only one unknownOr (b)Thus, the above formula can be used to calculateAnd。
In the process of obtainingAndThe total thickness of the low acoustic impedance material layer 1 and the total thickness of the high acoustic impedance material layer 2 may be determined based on the thickness of the matching layer.
Wherein the thickness of the matching layer can be determined according to the quarter-wavelength matching theory.
Specifically, when an acoustic wave propagates in a certain material (e.g., matching layer), the acoustic velocity c, the frequency f (period) Wavelength ofThe relation of (2) is:
According to the above equation, when the sound velocity and the frequency of the sound wave are known, the wavelength of the sound wave of a specific frequency when the sound wave propagates through a certain material (matching layer) can be determined.
After determining the wavelength of the acoustic wave as it propagates in the matching layer, then, according to the quarter-wavelength matching theory, it can be determined that the thickness of the matching layer is a quarter wavelength, that is,。
With thickness of matching layer and duty ratio of low acoustic impedance material layer 1And the duty ratio of the high acoustic impedance material layer 2The total thickness of the low acoustic impedance material layer 1 and the total thickness of the high acoustic impedance material layer 2 can be found.
In the stacking, it is ensured that the sum of the thicknesses of the layers of low acoustic impedance material 1 is equal to the total thickness of the layers of low acoustic impedance material, and the sum of the thicknesses of the layers of high acoustic impedance material 2 is equal to the total thickness of the layers of high acoustic impedance material.
Meanwhile, as shown in fig. 2, another core point of the present invention is that, in manufacturing the matching layer, the alternately stacked low acoustic impedance material layers 1 and high acoustic impedance material layers 2 are uniformly and symmetrically distributed as much as possible with respect to the center of the thickness of the matching layer. This has the following advantages:
1. As shown in fig. 3, the symmetrical distribution makes the low acoustic impedance 3 and the high acoustic impedance 4 of the theoretical acoustic impedance of the matching layer of the underwater acoustic transducer manufactured by the invention staggered. Further, as shown in fig. 4, the actual acoustic impedance 5 of the matching layer of the underwater acoustic transducer manufactured by the present invention is more uniformly distributed. That is, the symmetrical distribution ensures that the density distribution of the matching layer is as uniform as possible compared with the asymmetrical distribution, and further ensures that the acoustic impedance distribution is as uniform as possible.
Meanwhile, as shown in fig. 5, if the low acoustic impedance material layer and the high acoustic impedance material layer are thin enough, the actual acoustic impedance 6 distribution of the matching layer of the underwater acoustic transducer manufactured by the invention is smoother and more approximate to the ideal impedance value required by design after lamination.
Therefore, in the present invention, it is preferable that the thickness of each of the low acoustic impedance material layers is not more than 1mm and the thickness of each of the high acoustic impedance material layers is not more than 0.5mm. In this way, the layers 1 and 2 of each low and high acoustic impedance material are made sufficiently thin so that after lamination the actual acoustic impedance distribution will be smoother, closer to the ideal impedance value required by the design.
2. As shown in fig. 6, the symmetrical distribution ensures that the sound waves do not change direction as much as possible while traveling through the layers of the matching layer, according to the wave transmission theory.
Therefore, by the symmetrical distribution, the stack of the low acoustic impedance material layer 1 and the high acoustic impedance material layer 2 can have a smooth impedance change.
In the present invention, each layer of the low acoustic impedance layer 1 does not necessarily need to have the same thickness in the actual manufacturing process, and the lamination sequence shown in fig. 7 is also normal.
But preferably such that the thickness of the single layer of low acoustic impedance material 1 is greater than the thickness of the single layer of high acoustic impedance material 2.
Furthermore, in the present invention, it is preferable that some glue be provided between the adjacent low acoustic impedance material layers 1 and high acoustic impedance material layers 2. Thereby, it is facilitated to better crimp the low acoustic impedance material layer 1 and the high acoustic impedance material layer 2 together.
Also, preferably, when the alternately stacked low acoustic impedance material layers 1 and high acoustic impedance material layers 2 are crimped together, a large tonnage press may be used for crimping. The pressure of the press crimp can be chosen to be greater than 1 ton. Through the crimping of high pressure, can guarantee the thickness uniformity of matching layer, it is even to distribute to can effectively get rid of inside bubble, realize the uniformity of acoustic impedance, the thickness of matching layer.
Alternatively, the alternately stacked low acoustic impedance material layers 1 and high acoustic impedance material layers 2 may be crimped together by high temperature crimping. It should be noted that, when the high Wen Yajie is selected, the compression bonding temperature needs to be less than the melting deformation temperature of the low acoustic impedance material layer 1 and the high acoustic impedance material layer 2, so that the overall performance of the manufactured matching layer is prevented from being affected due to melting of the material layers caused by high-temperature compression bonding.
Alternatively, the high pressure crimping may also be performed in combination with the high temperature crimping. It will be appreciated by those skilled in the art that the particular manner in which the alternating layers of low acoustic impedance material 1 and high acoustic impedance material 2 are crimped together is not limited, and the above crimping is merely exemplary and is not intended to limit the scope or content of the method of making the matching layer of the underwater acoustic transducer of the present invention.
Because the matching layer manufactured by the manufacturing method of the invention is formed by stacking thin layers of materials, it is anticipated that the matching layer manufactured by the manufacturing method of the invention can be a flexible matching layer and can be manufactured into any shape, for example, the manufactured matching layer is in a plane shape, an arc shape, a wave shape or an irregular shape, and the like, so that the manufacturing requirement of a transducer with a special shape can be met.
In addition, by adopting the manufacturing method of the invention, the existing general materials such as a multi-layer circuit board, an FPC (flexible circuit board) and the like, and various plastic films, metal films and the like in the actual process can be used for manufacturing the matching layer of the transducer, so that the selection range of the matching layer of the transducer is greatly expanded. Thus, some matching layers meeting special requirements, such as ceramic electrodes and matching layers, and matching layers with shielding function, can be manufactured.
In addition, the material used for manufacturing the matching layer is a factor which must be considered for the attenuation coefficient of the material, and the manufacturing method of the invention can dynamically adjust the material of the low acoustic impedance material layer according to the frequency range of the transducer used by the matching layer (the low frequency uses a slightly softer material and the high frequency uses a slightly harder material), thereby realizing the adjustment of the attenuation coefficient of the matching layer.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and are not intended to limit the scope of the present invention. Modifications and equivalent substitutions can be made by those skilled in the art based on the present teachings without departing from the spirit and scope of the present teachings.
Claims (8)
1. The manufacturing method of the matching layer of the underwater acoustic transducer is characterized by comprising the following steps of:
1) Alternately stacking low acoustic impedance material layers (1) and high acoustic impedance material layers (2);
2) The alternately overlapped low acoustic impedance material layers (1) and high acoustic impedance material layers (2) are pressed together to form a matching layer;
wherein, according to the ideal acoustic impedance of the matching layer Determining the duty ratio coefficient of the low acoustic impedance material layer (1) and the duty ratio coefficient of the high acoustic impedance material layer (2) in the matching layer;
based on the ideal acoustic impedance of the matching layer The ratio of the low acoustic impedance material layer (1) and the ratio of the high acoustic impedance material layer (2) in the matching layer are determined by:
；
in the method, in the process of the invention, Is the density of the low acoustic impedance material layer,Is the duty cycle of the low acoustic impedance material layer in the matching layer,Is the Young's modulus of the low acoustic impedance material layer; is the density of the layer of high acoustic impedance material, Is the duty cycle of the high acoustic impedance material layer in the matching layer,Is the Young's modulus of the high acoustic impedance material layer; Is the density of the matching layer and, Is the speed of sound of the matching layer,Is the ideal acoustic impedance of the matching layer; And The sum of (2) is 1;
the alternately stacked low acoustic impedance material layers (1) and high acoustic impedance material layers (2) are uniformly and symmetrically distributed relative to the center of the thickness of the matching layer.
2. Method for producing a matching layer of an underwater acoustic transducer according to claim 1, characterized in that the thickness of a single layer of the low acoustic impedance material layer (1) is greater than the thickness of a single layer of the high acoustic impedance material layer (2).
3. The method of manufacturing a matching layer of an underwater acoustic transducer according to claim 2, characterized in that the thickness of a single layer of the low acoustic impedance material layer (1) is less than or equal to 1mm and the thickness of a single layer of the high acoustic impedance material layer (2) is less than or equal to 0.5mm.
4. A method of manufacturing a matching layer for an underwater acoustic transducer according to claim 3, characterized in that glue is provided between adjacent layers of low acoustic impedance material (1) and high acoustic impedance material (2).
5. Method for producing a matching layer for an underwater acoustic transducer according to claim 4, characterized in that a large tonnage press is used for the crimping and/or the high Wen Yajie when the alternately superimposed layers of low acoustic impedance material (1) and high acoustic impedance material (2) are crimped together.
6. The method of manufacturing a matching layer of an underwater acoustic transducer according to claim 5, characterized in that the low acoustic impedance material layer (1) is a plastic film, a plastic sheet, a veneer, a cork or a tissue; the high acoustic impedance material layer (2) is a metal film, a metal sheet, a plated metal film or a plated metal sheet.
7. The method of manufacturing a matching layer for an underwater acoustic transducer according to any of claims 1 to 6, wherein the matching layer manufactured is a flexible matching layer.
8. The method of manufacturing a matching layer for an underwater acoustic transducer according to claim 7, wherein the matching layer is manufactured in a planar shape, an arc shape, a wave shape or an irregular shape.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102598330A (en) * | 2009-09-01 | 2012-07-18 | 精量电子股份有限公司 | Multilayer acoustic impedance converter for ultrasonic transducers |
| CN113328719A (en) * | 2021-06-19 | 2021-08-31 | 深圳市封神微电子有限公司 | Solid assembled bulk acoustic wave resonator with temperature compensation function |
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