CN110191405A - Double frequency large scale piezo-electricity composite material spherical transducer and preparation method thereof - Google Patents
Double frequency large scale piezo-electricity composite material spherical transducer and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 67
- 239000000919 ceramic Substances 0.000 claims abstract description 30
- 229920000642 polymer Polymers 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 229920005570 flexible polymer Polymers 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims abstract description 6
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- 238000000034 method Methods 0.000 claims description 16
- 239000004020 conductor Substances 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
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- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
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- 229910052573 porcelain Inorganic materials 0.000 description 2
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
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- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
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Abstract
The present invention relates to a kind of double frequency large scale piezo-electricity composite material spherical transducers and preparation method thereof.The double frequency large scale piezo-electricity composite material spherical transducer includes piezo-electricity composite material spherical shell；The piezo-electricity composite material spherical shell includes multiple piezoresistive material stock columns, and the polymer being filled between each piezoresistive material stock column；The outer surface of the piezo-electricity composite material spherical shell pastes matching layer.The preparation method includes: positive pole-face cutting piezoelectric ceramic piece, filling flexible polymer, reverse side opposite joint ceramic cutting substrate, pressing mold bending, perfusion hard polymer, demoulds, is fixed on positioning tool, grinding or cutting, covering electrodes, splicing spherical shell.The present invention can prepare the spherical transducer of large scale (diameter is greater than 200mm), the energy converter can work at low frequency (10kHz or less), it can work again at high frequency (100kHz or more), can effectively make up existing spherical transducer can not work in the deficiency of low frequency and high frequency.
Description
Technical field
The invention belongs to underwater acoustic transducer technical fields, and in particular to a kind of double frequency large scale piezo-electricity composite material spherical shape is changed
Energy device and preparation method thereof.
Background technique
Energy converter is the device for carrying out energy conversion, is that a form of energy is converted to another form of device.
By sound wave be so far the mankind grasped uniquely can immense sea medium and long distance transmit information and energy carrier, mesh
Preceding undersea detection, communication, navigation, mapping etc. are dependent on greatly underwater acoustic transducer.Currently used underwater acoustic transducer is mainly piezoelectricity
Energy converter, piezoelectric element (i.e. inverting element) are its core components, directly determine the performance of energy converter.
Piezoelectric ceramic ball shell is usually used as its piezoelectric element in Spherical Piezoelectric Transducer, and what is utilized is piezoelectric ceramics
The radial vibration of spherical shell.But existing piezoelectric ceramic ball shell be difficult to accomplish larger size (for current technology, piezoelectric ceramics
The diameter of spherical shell is typically not greater than 200mm), and the resonance frequency of radial vibration and diameter are in inverse relation, this makes by ceramics
The working frequency of the energy converter of spherical shell preparation is confined to 10kHz or more, is not able to satisfy the demand for working in low-frequency range.And piezoelectricity
Ceramic spherical shell can not obtain pure thickness vibration, and directive property rises and falls very big when causing its high frequency (100kHz or more), so that
Existing spherical transducer can not meet the needs of high-frequency work.
Summary of the invention
The present invention is in view of the above-mentioned problems, propose a kind of double frequency large scale piezo-electricity composite material spherical transducer and its preparation side
Method can prepare large-sized spherical transducer, which can work and in high frequency at low frequency (10kHz or less)
Work, can effectively make up existing spherical transducer can not work in the deficiency of low frequency and high frequency.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of double frequency large scale piezo-electricity composite material spherical transducer, including piezo-electricity composite material spherical shell；The piezoelectricity is multiple
Condensation material spherical shell includes multiple piezoresistive material stock columns, and the polymer being filled between each piezoresistive material stock column；The Piezoelectric anisotropy
The outer surface of material spherical shell pastes matching layer.
Wherein, the directive property when addition of matching layer can inhibit energy converter high-frequency work rises and falls, and can further expand and change
It can device bandwidth.
Preferably, the piezo-electricity composite material spherical shell is large scale piezo-electricity composite material spherical shell, and large scale refers to that diameter is big
In 200mm.
Preferably, furthermore the piezoelectric material that the piezoresistive material stock column uses can also be piezoelectric monocrystal, have for piezoelectric ceramics
Machine piezoelectric material and lead-free piezoelectric material etc.；The polymer is epoxy resin and silicon rubber, furthermore can also be polyurethane, fourth
Nitrile rubber etc..
Preferably, in the piezo-electricity composite material spherical shell percent by volume of piezoelectric ceramics 0.20~0.80.
Preferably, the matching layer with a thickness of 1/4 of the wave length of sound in matching layer, or 1/4 wavelength or so carry out
Fine tuning；The material of matching layer can be the epoxy resin etc. added with aluminium powder or tungsten powder.
Further, the energy converter further includes backing, contact conductor, output cable and water-proof sound-transmitting layer, Piezoelectric anisotropy
Material spherical shell is fixed by backing, and contact conductor is connected with output cable, and the overall peripheral glue of energy converter seals water-proof sound-transmitting layer.
A method of above-mentioned double frequency large scale piezo-electricity composite material spherical transducer being prepared, step includes:
1. designing the structural parameters of large scale piezo-electricity composite material spherical shell, and prepare composite material spherical shell；
2. design prepares the structural parameters of the conformal matching layer of spherical surface, and is poured matching layer；
3. making spherical transducer using the composite material spherical shell prepared.
Further, step 1 includes:
1) patch of piezoelectric material is cut, forms the piezoresistive material stock column array with piezoelectric material substrate；
2) the filling flexible polymer in the piezoresistive material stock column array with piezoelectric material substrate；
3) according to stepping identical with step 1) and joint-cutting, opposite joint cuts piezoelectric material substrate from the negative, to form dependence
The flexible piezoelectric column of material array of flexible polymer connection；
4) it is bent flexible piezoelectric column of material array using spherical mould pressing mold, to form the piezoresistive material stock column battle array of curve form
Column；
5) hard polymer is perfused into curved piezoresistive material stock column array, and pressing mold solidifies；
6) hard polymer curing and demolding to be perfused, piezoresistive material stock column array are shaped into curved-surface structure；
7) curved-surface structure is fixed in positioning tool；
8) according to the shape of positioning tool, curved-surface structure is processed into the structure with positioning tool identical appearance；
9) the curved-surface structure surfaces externally and internally covering electrodes material after step 8) processing；
10) the extraction electrode lead on the curved-surface structure for be coated electrode material；
11) curved-surface structure for carrying out contact conductor is arranged on the conformal backing of spherical surface, and connecing with bonding curved-surface structure
The contact surface of the outer surface of seam and curved-surface structure inner surface and backing forms piezo-electricity composite material spherical shell.
Beneficial effects of the present invention are as follows:
The present invention can prepare the spherical transducer of large scale (diameter is greater than 200mm), which can be in low frequency
(10kHz or less) work, and can work at high frequency (100kHz or more), can effectively make up existing spherical transducer can not work
In the deficiency of low frequency and high frequency.
Detailed description of the invention
Fig. 1 is piezo-electricity composite material spherical shell radial vibration resonance frequency with diameter change curve.
Fig. 2 is piezo-electricity composite material shell thickness vibration resonance frequency with thickness profiles.
Fig. 3 is spherical shell piezo-electricity composite material preparation process flow.
Fig. 4 is spherical shell piezo-electricity composite material connecting method schematic diagram.
Fig. 5 is matching layer molding process flow chart.
Fig. 6 is double frequency large scale piezo-electricity composite material spherical transducer structural schematic diagram.
Fig. 7 is the limit element artificial module of spherical transducer.
Fig. 8 is conductance plots when spherical shell piezo-electricity composite material works in low frequency.
Fig. 9 is conductance plots when spherical shell piezo-electricity composite material works in high frequency.
Specific embodiment
Below by specific embodiments and the drawings, the present invention will be further described.
To keep the present invention apparent understandable, it is divided into three parts below and is described in detail: 1. design preparation large scale piezoelectricity
Composite material spherical shell；2. design prepares the conformal matching layer of spherical surface；3. design prepares spherical transducer.
1. design preparation large scale piezo-electricity composite material spherical shell
Large scale piezo-electricity composite material spherical shell is the key that energy converter realizes two-frequency operation and existing curved composite structures
The difficult point of preparation.The piezo-electricity composite material that the present embodiment uses illustrates piezo-electricity composite material spherical shell for 1-3 type composite material first
Structure design content, then illustrate the specific preparation step of the composite material spherical shell.
The structure of 1.1 piezo-electricity composite material spherical shells designs
The vibration of large scale piezo-electricity composite material spherical shell includes radial, thickness both modalities which, the resonance frequency of radial vibration
It can be in 10kHz hereinafter, resonance frequency when being energy converter low frequency operation；The resonance frequency of thickness vibration generally 100kHz with
On, resonance frequency when being energy converter high-frequency work.When designing the structure of piezo-electricity composite material spherical shell, the two frequencies all must
It must be designed accordingly, they are related with the diameter d of spherical shell and thickness t respectively.
1.1.1 the design of low-frequency resonant frequency --- the design of spherical shell diameter d
The radial vibration resonance frequency (working frequency when low frequency) of piezo-electricity composite material spherical shell can be by the diameter of piezoelectric element
It is obtained to Vibration Frequency Equations ((1) formula).
F in formulalFor the resonance frequency of radial vibration, d is the overall diameter of composite material spherical shell, flexible constantWith it is close
DegreeIt is the equivalent performance parameter of 1-3 type piezo-electricity composite material, equivalent performance parameter and piezoelectric ceramics volume percentage vcIt is related,
vcUsually take 0.2~0.8.
The curve changed by the resonance frequency that equation (1) can obtain radial vibration with diameter d, as shown in Figure 1.It can be with by Fig. 1
Find out, the resonance frequency of radial vibration is gradually decreased with the increase of diameter d.Frequency when according to energy converter low frequency operation
Calculate the diameter d of spherical shell.
1.1.2 the design of high-frequency resonant frequency --- the design of shell thickness t
The thickness vibration resonance frequency (working frequency when high frequency) of piezo-electricity composite material spherical shell can be by the thickness of piezoelectric element
Vibration Frequency Equations ((2) formula) is spent to obtain.
F in formulahFor the resonance frequency of thickness vibration, t is the thickness of composite material spherical shell, elastic constantAnd density?
It is the equivalent performance parameter of 1-3 type piezo-electricity composite material.
The curve changed by the resonance frequency that equation (2) can obtain thickness vibration with thickness t, as shown in Figure 2.It can be with by Fig. 2
Find out, the resonance frequency of thickness vibration is gradually decreased with the increase of thickness t.Frequency when according to energy converter high-frequency work
Calculate the thickness t of spherical shell.
1.2 piezo-electricity composite material spherical shell preparation processes
The present invention passes through cutting/filling/perfusion technological forming curved composite structures by Plane Piezoelectric Materials potsherd using first
Structure, then the preparation process by curved composite structures Structural assignments molding large scale piezo-electricity composite material spherical shell.Process flow chart
As shown in Figure 3, the specific steps are as follows:
1) positive pole-face cuts piezoelectric ceramic piece: using precision gas cutting machine to piezoelectric ceramic piece, (shape can be rectangle or circle
Shape) carry out laterally (x to) and longitudinal (y to) cutting, the ceramics pole column width being cut into for a (in the present embodiment, the end face of ceramics pole
It is square, a refers to the side length of square), width of slit b, cutting-in t1(t1It is that piezoelectric ceramic piece is whole thick less than t, t
Degree), the piezoelectric ceramics column array with ceramic bases is formed, as shown in Fig. 3 " 1) "；
2) filling flexible polymer: the piezoelectric ceramics column array in cleaning step 1, and filling flexible polymer (such as silicon rubber
Glue), as shown in Fig. 3 " 2) "；
3) reverse side opposite joint ceramic cutting substrate: according to ceramics pole column identical with the first step wide a and width of slit b, from anti-
Ceramic bases, cutting-in t are cut in face of seaming and cutting2(t2=t-t1), that is, guarantee ceramic bases to cut thoroughly, is formed and rely on flexible polymer
The flexible piezoelectric ceramic column array of connection, as shown in Fig. 3 " 3) "；
4) pressing mold is bent: utilizing spherical mould (inner surface diameter of mold is identical as the diameter d of spherical shell) pressing mold bending step
Flexible piezoelectric ceramic column array in rapid 3, to form the piezoelectric ceramics column array of curve form, as shown in Fig. 3 " 4) "；
5) polymer is perfused: being filled to being cut in the joint-cutting to be formed by step 3) reverse side opposite joint for curved porcelain knob array
It infuses hard polymer (such as epoxy resin), and pressing mold solidifies, as shown in Fig. 3 " 5) "；
6) demould: hard polymer curing and demolding to be perfused, it is multiple that flexible porcelain knob array has just been shaped into curved surface piezoelectric
Condensation material structure, as shown in Fig. 3 " 6) "；
7) it is fixed on positioning tool: curved surface piezoelectric composite structure is fixed in positioning tool, the shape of positioning tool
Used connecting method determines that as shown in Fig. 3 " 7) ", the connecting method of spherical shell is as shown in Figure 4 when shape splices according to spherical shell；
8) it grinds or cuts: being processed into curved-surface structure by the way of cutting or grinding according to the shape of positioning tool
With the structure of positioning tool identical appearance, as shown in Fig. 3 " 8) "；
9) covering electrodes: the curved-surface structure surfaces externally and internally covering electrodes material after previous step processing, electrode use magnetic control
Prepared by the modes such as sputtering, silk-screen printing or chemical plating, as shown in Fig. 3 " 9) "；
10) splice spherical shell: on the curved-surface structure for being coated electrode, using welding lead or by the way of sticking line film
Extraction electrode.The curved-surface structure of contact conductor will be carried out, by certain combination be arranged in the conformal backing of spherical surface (backing it is straight
Diameter be spherical shell interior diameter, as d-2t) on, and with bonding agent (such as epoxy resin) be bonded curved-surface structure seam and curved surface
The contact surface of the outer surface of structure interior surface and backing, as shown in Fig. 3 " 10) ".Ultimately form large scale piezo-electricity composite material
Spherical shell, as shown in Fig. 3 " 11) ".
2. design prepares the conformal matching layer of spherical surface
The parameter and structure of 2.1 matching layers design
The matching layer of spherical transducer uses the structure conformal with piezo-electricity composite material spherical shell, i.e. matching layer is also to have one
Determine the spherical shell of thickness.The material parameter of matching layer has density and the velocity of sound, and structural parameters are its thickness tm.These parameters on shift energy devices
Sound transparency, resonance frequency and conductance plots have a significant impact.It is reflected in different media according to sound wave and transmission case can obtain
Know, whenWhen, transmission coefficient t of the sound wave in matching layer material are as follows:
Wherein: Z1、Z2、Z3Acoustic impedance, matching layer acoustic impedance, acoustic impedance in water respectively in ceramics；L is matching layer
The thickness of material, k2The wave vector size for being sound wave in matching layer.When λ/4 l=, i.e., matching layer is with a thickness of 1/4 wave length of sound
When, sound wave is maximum by the transmission coefficient of matching layer.So general matching layer thickness chooses 1/4 wavelength and immobilizes or 1/4
Wavelength or so is finely adjusted.
In addition, when one timing of the velocity of sound and thickness for matching layer material in high frequency matching layer energy converter, due to matching layer material
Density becomes larger, and the quality for matching layer material increases with it, and is equivalent to energy converter and increases the load quality of itself.So energy converter
Conductance plots in water can be reduced with the increase of matching layer density, and nearby conductance also gradually drops resonance point energy converter in water
It is low.
When the matching density of layer material, one timing of thickness, according to the conductance plots of high frequency matching layer energy converter in water with
The velocity of sound variation (study [J] acoustic technique referring to: Tong Hui, Zhou Yiming, Wang Jialin, Weng Rulian high frequency wide-band transducer,
2013,32 (6): 525-527) it is found that crest frequency f there are two matching layer energy converter toolsH、fL, fHFor higher frequency, fLFor
Lower frequency, with the increase of the velocity of sound, fLElectric conductivity value increases, fHConductance reduces, and when the velocity of sound is certain value, matches layer material
Thickness is equal to velocity of sound when 1/4 wavelength, and energy converter has optimal bandwidth.With continuing growing for the velocity of sound, fLElectric conductivity value after
It is continuous to increase, fHConductance continues to reduce, however the resonance point f of energy converterH、fLIt is held essentially constant.This is mainly due to matching layer materials
The variation of the material velocity of sound has been directly changed the wavelength of sound wave in matching layer material, while influencing energy converter matching layer material in different frequencies
Acoustical transimittivity under rate.And matching layer acoustic velocity of material depends on the Young's modulus and density of material, relational expression between them are as follows:
Wherein v is the matching layer velocity of sound, Y0For matching layer Young's modulus, ρ is matching layer density.So by adjusting matching layer
Its velocity of sound is adjusted in Young's modulus and density, and then adjusts transducer performance.
When the matching density of layer material, one timing of the velocity of sound, according to the conductance plots of high frequency matching layer energy converter in water with
Thickness change (referring to: Tong Hui, Zhou Yiming, Wang Jialin, Weng Rulian high frequency wide-band transducer research [J] acoustic technique, 2013,
32 (6): 525-527) as can be seen that with matching layer material thickness increase, resonance frequency f in energy converter waterHThe conductance at place
It is gradually increased, fLThe conductance at place is gradually reduced, and when matching layer is with a thickness of 1/4 wavelength, total transmissivity occurs, energy converter, which has, relatively to be managed
The conductance plots thought.Continue to increase with thickness, the f in energy converter water in conductance plotsHThe conductance at place continues to increase, fLPlace
Conductance continue to reduce.
In conclusion according to transducer performance with the changing rule of matching layer thickness, the velocity of sound and density, in order to guarantee to match
Layer has good sound translative performance, and matching layer thickness generally chooses 1/4 wavelength and immobilizes or be finely adjusted in 1/4 wavelength or so；
Transducer performance can be adjusted by adjusting density of material and Young's modulus, it is final to determine Optimum Matching layer material parameter.
The preparation of 2.2 matching layers
Layer parameter is matched according to obtained in 2.1, chooses appropriate material as the raw material for preparing matching layer, here
Metal (such as aluminium powder) or oxide (tungsten oxide) particle preparation is added with polymer (such as epoxy resin) with layer choosing.Pass through regulation gold
The ratio of category or oxide particle in the polymer is the density and Young's modulus of controllable material, matching layer thickness tmIt is chosen at
Near 1/4 wavelength.Matching layer is prepared using molding process, and preparation process flow such as Fig. 5 shows, comprising the following steps:
1) composite material spherical shell is put into perfusion mold, as shown in " 1 " in Fig. 5, wherein the effect of " positioning screw " is
Fixing composite material spherical shell makes spherical shell surface every bit being equidistant to die inside, so that the matching layer thickness of perfusion is equal
It is even equal；
2) mixing (i.e. the material of matching layer, such as epoxy resin added with aluminium powder or tungsten powder) is perfused in fill orifice, such as
In Fig. 5 shown in " 2 ", and solidify matching layer；
3) it demoulds, the sensing element with matching layer, that is, composite material spherical shell is formed, as shown in " 3 " in Fig. 5.
3. designing and producing spherical transducer
The structure of 3.1 energy converters
Fig. 6 is double frequency large scale piezo-electricity composite material spherical transducer structure, it includes large scale piezo-electricity composite material ball
Shell, matching layer, backing, contact conductor, water-proof sound-transmitting layer and output cable, wherein backing is inside spherical shell, as shown in Figure 5.
The simulating, verifying of 3.2 energy converters
In order to verify feasibility of the invention, we are established using finite element analysis software ANSYS and are not added with matching layer
Large scale piezo-electricity composite material spherical transducer limit element artificial module (Fig. 7), according to the symmetry of spherical transducer, this
In take corresponding 16 flat units on spherical transducer to be modeled.The diameter d=200mm of spherical shell, thickness t are in model
7.2mm, piezoelectric ceramics PZT5-H, polymer are epoxy resin and silicon rubber, silicon rubber thickness t1=3mm.Piezoelectric ceramics is adopted
With three-dimensional coupled field cell S olid5, polymer phase uses Solid185 three-dimensional structural analysis unit, and in piezo-electricity composite material
Spherical shell inner surface loads 0V voltage, and outer surface loads 1V voltage, carries out harmonic responding analysis, obtains the conductance plots of low frequency and high frequency
(Fig. 8 and Fig. 9).There is a resonance peak, resonance in low-frequency range and high band respectively in energy converter it can be seen from conductance plots
Frequency is respectively 3.961kHz and 188kHz, they respectively correspond radial vibration resonance frequency flWith thickness vibration resonance frequency fh。
The production of 3.3 energy converters
Composite material is prepared using the preparation process of piezo-electricity composite material spherical shell in Section 1 according to the calculated results
Spherical shell；Using the preparation process of Section 2 matching layer, the conformal matching layer of spherical surface is coated in composite material spherical shell outer surface；It processes
Mold is perfused in positioning screw and water-proof sound-transmitting layer；Cable uses the water-proof cable with shielding line.First by contact conductor when assembly
It is connect with output cable, then positioning screw is Nian Jie with backing, the structure that the whole series assemble finally is placed in water-proof sound-transmitting layer
In casting mold, polyurethane adhesive envelope is prepared, the conformal water-proof sound-transmitting layer of spherical surface is formed by curing, completes energy converter production.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, the ordinary skill of this field
Personnel can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the spirit and scope of the present invention, this
The protection scope of invention should be subject to described in claims.
Claims (10)
1. a kind of double frequency large scale piezo-electricity composite material spherical transducer, which is characterized in that including piezo-electricity composite material spherical shell；Institute
Stating piezo-electricity composite material spherical shell includes multiple piezoresistive material stock columns, and the polymer being filled between each piezoresistive material stock column；It is described
The outer surface of piezo-electricity composite material spherical shell pastes matching layer.
2. double frequency large scale piezo-electricity composite material spherical transducer according to claim 1, which is characterized in that the piezoelectricity
The piezoelectric material that column of material uses is one of the following: piezoelectric ceramics, piezoelectric monocrystal, organic piezoelectric materials；The polymer
For one of the following: epoxy resin, silicon rubber, polyurethane, nitrile rubber.
3. double frequency large scale piezo-electricity composite material spherical transducer according to claim 1, which is characterized in that the piezoelectricity
The diameter of composite material spherical shell is greater than 200mm；The percent by volume of piezoelectric material is 0.20 in the piezo-electricity composite material spherical shell
~0.80.
4. double frequency large scale piezo-electricity composite material spherical transducer according to claim 1, which is characterized in that the matching
Layer with a thickness of 1/4 of the wave length of sound in matching layer, or be finely adjusted in 1/4 wavelength or so.
5. double frequency large scale piezo-electricity composite material spherical transducer according to claim 1, which is characterized in that the matching
The material of layer is the epoxy resin added with aluminium powder or tungsten powder.
6. double frequency large scale piezo-electricity composite material spherical transducer according to claim 1, which is characterized in that energy converter packet
Backing, contact conductor, output cable and water-proof sound-transmitting layer are included, the piezo-electricity composite material spherical shell is fixed by backing, and electrode draws
Line is connected with output cable, and the overall peripheral glue of spherical transducer seals water-proof sound-transmitting layer.
7. a kind of method for preparing double frequency large scale piezo-electricity composite material spherical transducer described in claim 1, which is characterized in that
The following steps are included:
1) patch of piezoelectric material is cut, forms the piezoresistive material stock column array with piezoelectric material substrate；
2) the filling flexible polymer in the piezoresistive material stock column array with piezoelectric material substrate；
3) according to stepping identical with step 1) and joint-cutting, opposite joint cuts piezoelectric material substrate from the negative, to be formed by flexible
The flexible piezoelectric column of material array of polymer connection；
4) it is bent flexible piezoelectric column of material array using spherical mould pressing mold, to form the piezoresistive material stock column array of curve form；
5) hard polymer is perfused into curved piezoresistive material stock column array, and pressing mold solidifies；
6) hard polymer curing and demolding to be perfused, piezoresistive material stock column array are shaped into curved-surface structure；
7) curved-surface structure is fixed in positioning tool；
8) according to the shape of positioning tool, curved-surface structure is processed into the structure with positioning tool identical appearance；
9) the curved-surface structure surfaces externally and internally covering electrodes material after step 8) processing；
10) the extraction electrode lead on the curved-surface structure for be coated electrode material；
11) curved-surface structure for carrying out contact conductor is arranged on the conformal backing of spherical surface, and with bonding curved-surface structure seam with
And the contact surface of the outer surface of curved-surface structure inner surface and backing, form piezo-electricity composite material spherical shell；
12) matching layer is prepared in the outer surface of piezo-electricity composite material spherical shell.
8. the method according to the description of claim 7 is characterized in that step 8) using cutting or grinding by the way of, by curved surface knot
Structure is processed into the structure with positioning tool identical appearance.
9. the method according to the description of claim 7 is characterized in that step 10) is using welding lead or sticks line film
Mode prepares contact conductor.
10. the method according to the description of claim 7 is characterized in that the piezoelectricity of matching layer will be prepared after step 12)
Composite material spherical shell is fixed by backing, and contact conductor is connected with output cable, then in the overall peripheral glue of energy converter
Seal water-proof sound-transmitting layer.
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