CN112221917A - High-power high-frequency directional emission underwater acoustic transducer and preparation method thereof - Google Patents
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- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- B06B1/0662—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface
- B06B1/067—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface which is used as, or combined with, an impedance matching layer
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- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
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- B06B1/0685—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface and a damping structure on the back only of piezoelectric elements
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Abstract
The invention relates to a high-power high-frequency directional emission underwater acoustic transducer and a preparation method thereof. The transmitting underwater acoustic transducer comprises a piezoelectric composite material, an electrode, a matching layer, a heat dissipation structure and a sound absorption backing; the piezoelectric composite material is a 1-1-3 type piezoelectric composite material and consists of a piezoelectric phase, a passive phase and a structural phase, wherein the piezoelectric phase is a piezoelectric material column array, the structural phase is a rigid material frame positioned between piezoelectric material columns, and the passive phase is a flexible polymer positioned between the piezoelectric phase and the structural phase; the heat dissipation structure is a rigid material frame with the same structure as that of the piezoelectric composite material; an acoustic backing is distributed in the heat dissipating structure. The invention designs the transmitting type transducer with the characteristics of high frequency, high directivity, high power, low loss, quick heat dissipation and the like by applying the piezoelectric material with low loss and high pressure resistance and combining the 1-1-3 type piezoelectric composite structure, and can realize the directional energy continuous transmission through sound waves within the distance range of 10m in the marine environment.
Description
Technical Field
The invention belongs to the technical field of piezoelectric transducers, and particularly relates to a high-frequency underwater acoustic transducer with high-power directional sound wave emission characteristics based on a piezoelectric composite material and a preparation method thereof.
Background
With the development of Unmanned Underwater Vehicles (UUV) and underwater sensor networks, the point energy supply mode of these devices needs higher and higher automation degree and remote transmission. The traditional salvage charging and electromagnetic underwater wireless charging have the characteristics of high charging efficiency, but the operation difficulty is high, and most applications are limited by the defects that the charging distance is only several millimeters and the like.
In recent years, underwater wireless transmission technology of electric energy has received wide attention all over the world. The charging mode gets rid of the constraint of a redundant wire, can realize independent packaging, and improves the reliability, the mobility and the concealment. At present, the underwater wireless power transmission technology mainly comprises two modes, namely an electromagnetic mode and an ultrasonic mode, and energy is transmitted by taking an electromagnetic field and sound waves as media respectively. It is known that seawater has good conductivity and large conductivity, so that a high-frequency alternating magnetic field can generate eddy current loss in seawater, and transmission efficiency is influenced. In addition, the mode of transmitting energy through an electromagnetic field has a great limit to the acting distance, and charging is usually kept within millimeter range, so that accurate butt joint of the charger and the current collector is ensured in the underwater charging process, and time and cost are high. For small-sized underwater sensor network nodes, the operability is poor, and the method is only suitable for large underwater fixed charging stations to charge large UUV and other devices with high power of hundreds of watts to kilowatts. And under the condition of ensuring the charging efficiency, the sound energy power supply mode has no underwater interface, can realize remote charging, does not need complex operations such as accurate positioning and the like, and is a potential optimal solution for wirelessly supplying power for network nodes of small UUV and underwater sensors.
The biggest advantage of underwater sound wave wireless charging is that the underwater transmission distance is long. Compared with the electromagnetic induction type, the mode does not generate electromagnetic interference to the outside and is not influenced by the electromagnetic interference, the wavelength of the mode is far smaller than that of electromagnetic waves, the transmission directivity is good, and the energy is more easily concentrated. The current research situation shows that underwater sound wave wireless charging can be realized at a distance of 6cm, which reveals that the sound wave wireless charging has feasibility, but the transmission power is small, the action distance is short, and more technical difficulties need to be overcome. This is because researchers have generally ignored the influence of the hydroacoustic transmitting and receiving transducer as the acoustic wave conversion device on the charging effect. First, researchers have commonly used the same transducer as the transmitting and receiving ends, and have not performed the characteristics of the transmitting transducer and the receiving transducer, resulting in energy loss. Secondly, researchers generally ignore the scattering loss of the sound wave during transmission, thereby making the charging inefficient. Also, relatively little research has been done on transducer energy conversion efficiency, transmit transducer heat dissipation issues, acoustic matching of the transducer to water, acoustic energy focusing, etc.
Therefore, how to realize the design of the high-frequency high-power directional underwater acoustic transducer and solve the problem of heat dissipation when the transducer works continuously at high power in the future research of underwater acoustic wave wireless charging are important problems. It is known that the purpose of the conventional underwater acoustic transducer design is to increase the detection distance and the detection spatial range as much as possible, and the underwater acoustic transducer is mainly focused on the characteristics of low frequency, large beam opening angle and the like. This transducer design causes the acoustic energy to be spread out into a larger space. Therefore, the underwater acoustic wave wireless charging device designed by relying on the traditional transducer has the advantage that the achievable energy transfer efficiency is necessarily smaller as the acoustic wave transfer distance is increased. On the other hand, in the application background of sonar and underwater acoustic communication, the underwater acoustic transducer usually works under the pulse excitation condition (for example, the pulse duty ratio is 2%), and the heat generated by the internal part due to loss can be dissipated in time, and a special heat dissipation design is usually not needed. In the field of underwater charging, the transmitting transducer is required to work continuously with high power, and the heat dissipation design becomes an inevitable core key problem.
Disclosure of Invention
The underwater sound energy continuous directional transmission device is used for realizing the high-power continuous directional transmission of underwater sound energy and meeting the requirements of wireless remote power supply of an underwater unmanned vehicle and an underwater sensor network. The invention adopts piezoelectric materials such as piezoelectric ceramics with low loss and high pressure resistance, and designs the transmitting transducer with the characteristics of high frequency, high directivity, high power, low loss, quick heat dissipation and the like by combining a 1-1-3 type piezoelectric composite structure.
The technical scheme adopted by the invention is as follows:
a high-power high-frequency directional emission underwater acoustic transducer comprises a piezoelectric composite material, electrodes, a matching layer, a heat dissipation structure and a sound absorption backing; the piezoelectric composite material is a 1-1-3 type piezoelectric composite material and consists of a piezoelectric phase, a passive phase and a structural phase, wherein the piezoelectric phase is a piezoelectric material column array, the structural phase is a rigid material frame positioned between piezoelectric material columns, and the passive phase is a flexible polymer positioned between the piezoelectric phase and the structural phase; the two surfaces of the piezoelectric composite material in the thickness direction cover the electrodes; the matching layer is positioned on one side of the piezoelectric composite material, and the heat dissipation structure and the sound absorption backing are positioned on the other side of the piezoelectric composite material; the heat dissipation structure is a rigid material frame which has the same structure as that of the piezoelectric composite material; the acoustic backing is distributed in the heat dissipating structure.
Furthermore, the heat dissipation structure and the heat dissipation structure (i.e. the structure phase) contained in the piezoelectric composite material have the same material and structure size; the heat dissipation structure and the heat dissipation structure (i.e., the structure) included in the piezoelectric composite material are closely matched with each other to achieve good heat transfer.
Further, still include shell and cable. The shell is a metal shell, and the heat dissipation structure is tightly connected with the metal shell so as to realize good heat transfer. The cable is connected to the lead on the electrode.
Furthermore, the piezoelectric phase material in the piezoelectric composite material is made of low-loss piezoelectric ceramics or piezoelectric crystals, and can be piezoelectric ceramics, piezoelectric crystals and the like.
Furthermore, the passive phase material in the piezoelectric composite material is made of high temperature resistant flexible polymer, and can be polyphenylene, parylene, polyarylether, polyarylate, aromatic polyamide, polyimide, silicon rubber and the like.
Furthermore, the structural phase material in the piezoelectric composite material is prepared into a grid structure by a machining mode by using a material with a good heat dissipation characteristic, and can be a carbon fiber composite material or a low-density metal material such as aluminum alloy and titanium alloy.
Further, the matching layer is a trapezoid matching layer, and the lower bottom surface of each trapezoid of the trapezoid matching layer is opposite to the upper surface of the piezoelectric material column in the piezoelectric composite material.
A method for preparing the high-power high-frequency directional transmitting underwater acoustic transducer comprises the following steps:
1) cutting a whole block of piezoelectric material into a piezoelectric material column array which is arranged periodically;
2) placing the processed rigid material frame between the piezoelectric material column arrays, pouring passive phase materials into gaps between the rigid material frame and the piezoelectric material columns, and curing;
3) polishing the upper surface and the lower surface to a required thickness, and preparing metal electrodes on the upper surface and the lower surface to form a 1-1-3 type piezoelectric composite material;
4) welding a lead on the upper electrode surface and the lower electrode surface of the 1-1-3 type piezoelectric composite material;
5) bonding the lower electrode surface of the 1-1-3 type piezoelectric composite material with a heat dissipation structure formed by a rigid material frame, and keeping the rigid material frame matched with the rigid material frame in the 1-1-3 type piezoelectric composite material;
6) pouring or bonding a sound absorption backing material in a heat dissipation structure formed by a rigid material frame, and curing;
7) bonding the processed trapezoid matching layers on the electrode surfaces of the 1-1-3 type piezoelectric composite materials, and keeping the lower bottom surface of each trapezoid opposite to the upper surfaces of the piezoelectric material columns;
8) assembling the structure obtained in the step 7) and a structural member, and welding a lead and a watertight cable;
9) and (3) placing the structure obtained in the step 8) in a mould, filling a waterproof sound-transmitting layer, and curing to finish the manufacture of the transducer.
A transmitting hydroacoustic transducer array comprising at least two high power high frequency directional transmitting hydroacoustic transducers as described above.
The invention has the following beneficial effects:
aiming at the requirement of wireless power supply of network nodes of an underwater unmanned vehicle and a sensor, the invention applies piezoelectric ceramics with low loss and high pressure resistance, and designs an emitting type transducer with the characteristics of high frequency, high directivity, high power, low loss, quick heat dissipation and the like by combining a 1-1-3 type piezoelectric composite structure. Finally, the continuous transmission of the directional energy through the sound wave in the distance range of 10m under the marine environment is realized.
The invention expands the research on loss and heat dissipation to the research field of piezoelectric composite materials and transducers for the first time. From the research of low-loss piezoelectric materials, a heat dissipation structure is introduced into a piezoelectric composite material and is expanded to a transducer structure, and a design scheme of a high-power continuous-working underwater acoustic emission transducer is explored. The research and development of the novel underwater acoustic transmitting transducer can also change the application mode of the traditional high-frequency sonar, and develop new application fields such as underwater directional communication, underwater acoustic fuze and the like.
Drawings
Fig. 1 is a schematic diagram of a high power, directional hydroacoustic emitting transducer configuration.
FIG. 2 is a schematic structural view of a 1-1-3 type composite material. Wherein (a) is a perspective view and (b) is a top view.
Fig. 3 is a graph of underwater acoustic performance of a directional hydroacoustic emitting transducer where (a) is the sample a emission voltage response curve, (B) is the sample B emission voltage response curve, (c) is the sample A, B sound source level curve, and (d) is the sample A, B directivity curve.
FIG. 4 is a schematic diagram of near field acoustic radiation characteristics of a transmitting transducer.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention shall be described in further detail with reference to the following detailed description and accompanying drawings.
The structure of the high-power directional underwater sound emission transducer of the embodiment is shown in fig. 1 and comprises a piezoelectric composite material, a matching layer, a heat dissipation structure, a sound absorption backing, a waterproof sound transmission layer and a shell. The piezoelectric composite material adopts a large-size 1-1-3 type piezoelectric composite material prepared by a cutting-filling process so as to realize the advantages of high power and directional sound wave emission of the transducer. The electrode (not shown in figure 1) of the piezoelectric composite material adopts low-temperature solidified silver paste, and simultaneously meets high weldability and high firmness. A trapezoidal matching layer as shown in fig. 1 is employed to achieve both acoustic impedance matching and displacement amplification effects.
Conventional transducers take the form of pulsed excitation and operate in an underwater environment, so conventional transducers do not incorporate heat dissipating structures. However, in the present invention, since the transmitting transducer operates under high power and adopts a continuous sine wave excitation form, a heat dissipation structure needs to be introduced into the structural member as an extension of a heat dissipation mechanism in the composite material (i.e., a frame type heat dissipation structure formed by the third phase in the piezoelectric composite material), so as to achieve further heat dissipation. The heat dissipation structure and a third phase material in the 1-1-3 type piezoelectric composite material have the same material and structure, and a high-sound-impedance epoxy resin tungsten powder mixture is added into the pores of the heat dissipation structure to serve as a backing sound absorption material to form a sound absorption backing.
In the structure of the 1-1-3 type composite material of this embodiment, as shown in fig. 2, the piezoelectric columns (first phase material, also called piezoelectric phase) are connected in one dimension in the z direction, and a layer of flexible polymer (second phase material, also called passive phase) which is also connected only in the z direction is surrounded, while the rigid material (third phase material, also called structural phase) is connected in the x, y and z directions and plays a role of lateral support. The conversion between vibration energy and electric energy is realized by utilizing the longitudinal stretching mode of a first phase material in the 1-1-3 type piezoelectric composite material; the piezoelectric column works in an approximate free vibration state by utilizing the low Young modulus of a second phase material in the piezoelectric composite material, so that the energy conversion efficiency is further improved, and meanwhile, rubber with high heat conductivity coefficient is selected to realize timely dissipation of heat generated by the piezoelectric column and an interface; the mechanical stability of the piezoelectric composite material is realized by utilizing the high Young modulus of a third phase material in the piezoelectric composite material, and meanwhile, carbon fiber or low-density metal material with high heat conductivity coefficient is selected as the third phase material to realize further heat dissipation. By regulating and controlling the proportion of the piezoelectric phase in the piezoelectric composite material, the density of the composite material can be reduced, the aim of reducing acoustic impedance is fulfilled, and the optimal matching between the piezoelectric composite material and water is realized through the matching layer.
The high-power high-frequency directional transmitting underwater acoustic transducer shown in figure 1 is prepared by the following steps:
1) cutting a whole piece of piezoelectric ceramic into piezoelectric ceramic column arrays which are arranged periodically;
2) placing the processed rigid material frame between the piezoelectric ceramic column arrays, pouring a passive phase material (rubber with high thermal conductivity coefficient) into a gap between the frame and the piezoelectric ceramic columns, and curing;
3) polishing the upper surface and the lower surface to a required thickness, and preparing metal electrodes on the upper surface and the lower surface to form a 1-1-3 type piezoelectric composite material;
4) welding a lead on the upper electrode surface and the lower electrode surface of the 1-1-3 type piezoelectric composite material;
5) bonding the lower electrode surface of the 1-1-3 type piezoelectric composite material with a heat dissipation structure formed by a rigid material frame, and keeping the rigid material frame matched with the rigid material frame in the 1-1-3 type piezoelectric composite material;
6) pouring or bonding a sound absorption backing material in a heat dissipation structure formed by a rigid material frame, and curing;
7) bonding the processed trapezoid matching layer on the electrode surface of the 1-1-3 type piezoelectric composite material, and keeping the lower bottom surface of each trapezoid opposite to the upper surface of the piezoelectric ceramic column;
8) assembling the structure and the structural member, and welding the conducting wire and the watertight cable;
9) and (3) placing the structure in a mould, filling the waterproof sound-transmitting layer, and curing to finish the manufacture of the transducer.
The key technology of the invention comprises the following steps:
1) piezoelectric composite material and high-power underwater sound emission transducer heat dissipation technology.
A frame type heat dissipation structure with excellent heat dissipation effect (namely, a frame type heat dissipation structure formed by a third phase in the piezoelectric composite material) is led out through the piezoelectric composite material and the high-power underwater sound emission transducer and between the piezoelectric ceramic materials through the structural form of the composite material. On one hand, the frame structure in the 1-1-3 type composite material is skillfully utilized, so that the original structural support effect is ensured, and the heat dissipation function is endowed. On the other hand, the heat dissipation structure is closer to the source of heat generation and wraps the heat generation source, so that the heat transfer distance is reduced to the maximum extent, the heat transfer area is increased, and a better heat dissipation effect is achieved.
2) The beam opening angle and side lobe suppression technology of the high-power underwater acoustic emission transducer.
For the 1-1-3 type piezoelectric composite material, the surface vibration distribution is not completely consistent, the vibration displacement of the position of the piezoelectric phase is large, and the vibration displacement of the position of the polymer phase is approximately zero. Therefore, according to the principle of superposition of acoustic wave point source radiation, the beam opening angle of the transducer can be controlled by adjusting the arrangement mode among the piezoelectric elements in the transducer, and the fluctuation of the side lobe is adjusted, so that the side lobe suppression effect is achieved, acoustic wave energy is more concentrated in the main lobe, and the energy transfer loss is reduced.
To increase transmit transducer power and control the beam opening angle, this may be accomplished in the form of a transmit transducer array, as shown on the left side of fig. 4. Compared with a single transmitting transducer, the radiating surface of the transducer array is increased, the beam opening angle is smaller, the area required by the corresponding hydrophone is smaller, and the acting distance is longer. In consideration of the practical working condition of underwater wireless charging, the receiving hydrophone can appear in a far field or a near field of the transmitting transducer, so that the size of the hydrophone is not too small for improving the charging action range, and the receiving hydrophone array can be adopted. Once the hydrophone is in the near-field region of the transmitting transducer, the hydrophone can be decomposed into a plurality of sub-hydrophones, and the sub-hydrophones satisfying the far-field conditions of the sub-transmitting transducers are used for receiving acoustic energy. Therefore, in actual operation, the hydrophone array also needs to be designed with a plurality of independent charging circuits.
By using the underwater acoustic transducer, wireless remote power supply of an underwater unmanned vehicle and an underwater sensor network can be realized. The conversion from electric energy to sound energy is realized through the inverse piezoelectric effect of the underwater acoustic transducer, then the sound wave is radiated through the water medium, when the sound wave reaches the underwater unmanned vehicle and the hydrophones of the underwater sensor network, the sound energy is converted into the electric energy through the piezoelectric effect, and then the load charging is realized through the matching circuit.
The invention uses large-size piezoelectric composite material to prepare the directional underwater sound emission transducer, the side length of the piezoelectric composite material is 200mm, and the performance index of the transducer is shown in figure 3. The resonance frequency of the transducer is about 150kHz, the maximum transmission voltage response reaches 183.6dB, and the working frequency range of-3 dB is as follows: 126 kHz-174 kHz and the bandwidth reaches 48 kHz. The maximum sound source level of the transducer reaches 233.2dB, the directivity opening angle of-3 dB is 3 degrees, namely, when the charging distance is 1m, the covering arc length of-3 dB is 5 cm; when the charging distance is 10m, the-3 dB covering arc length is 50 cm. The maximum sidelobe level of the transducer is-23.65 dB, indicating that the energy is mainly concentrated in the main lobe.
The foregoing disclosure of the specific embodiments of the present invention and the accompanying drawings is directed to an understanding of the present invention and its implementation, and it will be appreciated by those skilled in the art that various alternatives, modifications, and variations may be made without departing from the spirit and scope of the invention. The present invention should not be limited to the disclosure of the embodiments and drawings in the specification, and the scope of the present invention is defined by the scope of the claims.
Claims (10)
1. A high-power high-frequency directional emission underwater acoustic transducer is characterized by comprising a piezoelectric composite material, an electrode, a matching layer, a heat dissipation structure and a sound absorption backing; the piezoelectric composite material is a 1-1-3 type piezoelectric composite material and consists of a piezoelectric phase, a passive phase and a structural phase, wherein the piezoelectric phase is a piezoelectric material column array, the structural phase is a rigid material frame positioned between piezoelectric material columns, and the passive phase is a flexible polymer positioned between the piezoelectric phase and the structural phase; the two surfaces of the piezoelectric composite material in the thickness direction cover the electrodes; the matching layer is positioned on one side of the piezoelectric composite material, and the heat dissipation structure and the sound absorption backing are positioned on the other side of the piezoelectric composite material; the heat dissipation structure is a rigid material frame which has the same structure as that of the piezoelectric composite material; the acoustic backing is distributed in the heat dissipating structure.
2. The high power, high frequency directional transmitting underwater acoustic transducer according to claim 1, characterized in that said heat dissipating structure and said structure in said piezoelectric composite material are closely matched to each other to achieve good heat transfer.
3. The high power high frequency directional transmitting underwater acoustic transducer according to claim 1, further comprising a housing and a cable; the shell is a metal shell, and the heat dissipation structure is tightly connected with the metal shell to realize good heat transfer; the cable is connected to the lead on the electrode.
4. The high power, high frequency directional transmitting underwater acoustic transducer according to claim 1, characterized in that said piezoelectric phase is a low loss piezoelectric ceramic or crystal.
5. The high power high frequency directional transmitting underwater acoustic transducer according to claim 1, characterized in that said passive phase is a high temperature resistant flexible polymer.
6. The high power high frequency directionally emitting underwater acoustic transducer of claim 5 wherein said passive phase is one of polyphenylene, parylene, polyarylether, polyarylate, aromatic polyamide, polyimide, silicone rubber.
7. The high-power high-frequency directional-emission underwater acoustic transducer according to claim 1, wherein the structural phase is a grid structure prepared by machining a material with good heat dissipation performance; the material of the structural phase is a carbon fiber composite material or a low-density metal material.
8. The method of claim 1, wherein the matching layer is a trapezoidal matching layer, and a lower bottom surface of each trapezoid of the trapezoidal matching layer is opposite to an upper surface of a pillar of piezoelectric material in the piezoelectric composite.
9. A method for preparing the high-power high-frequency directional transmitting underwater acoustic transducer of claim 1, which comprises the following steps:
1) cutting a whole block of piezoelectric material into a piezoelectric material column array which is arranged periodically;
2) placing the processed rigid material frame between the piezoelectric material column arrays, pouring passive phase materials into gaps between the rigid material frame and the piezoelectric material columns, and curing;
3) polishing the upper surface and the lower surface to a required thickness, and preparing metal electrodes on the upper surface and the lower surface to form a 1-1-3 type piezoelectric composite material;
4) welding a lead on the upper electrode surface and the lower electrode surface of the 1-1-3 type piezoelectric composite material;
5) bonding the lower electrode surface of the 1-1-3 type piezoelectric composite material with a heat dissipation structure formed by a rigid material frame, and keeping the rigid material frame matched with the rigid material frame in the 1-1-3 type piezoelectric composite material;
6) pouring or bonding a sound absorption backing material in a heat dissipation structure formed by a rigid material frame, and curing;
7) bonding the processed trapezoid matching layers on the electrode surfaces of the 1-1-3 type piezoelectric composite materials, and keeping the lower bottom surface of each trapezoid opposite to the upper surfaces of the piezoelectric material columns;
8) assembling the structure obtained in the step 7) and a structural member, and welding a lead and a watertight cable;
9) and (3) placing the structure obtained in the step 8) in a mould, filling a waterproof sound-transmitting layer, and curing to finish the manufacture of the transducer.
10. A transmitting underwater acoustic transducer array, characterized by comprising at least two high-power high-frequency directional transmitting underwater acoustic transducers as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010921907.7A CN112221917B (en) | 2020-09-04 | 2020-09-04 | High-power high-frequency directional emission underwater acoustic transducer and preparation method thereof |
| EP20952299.4A EP4173728A4 (en) | 2020-09-04 | 2020-12-04 | High-power high-frequency directional transmission underwater acoustic transducer and manufacturing method therefor |
| PCT/CN2020/133855 WO2022048058A1 (en) | 2020-09-04 | 2020-12-04 | High-power high-frequency directional transmission underwater acoustic transducer and manufacturing method therefor |
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| CN202010921907.7A CN112221917B (en) | 2020-09-04 | 2020-09-04 | High-power high-frequency directional emission underwater acoustic transducer and preparation method thereof |
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| Country | Link |
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| EP (1) | EP4173728A4 (en) |
| CN (1) | CN112221917B (en) |
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| CN113394336A (en) * | 2021-05-17 | 2021-09-14 | 中国科学院上海硅酸盐研究所 | Gradient piezoelectric composite material, method for producing same, and piezoelectric transducer |
| CN115166706A (en) * | 2022-06-14 | 2022-10-11 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | Multi-beam trapezoidal high-frequency receiving transducer array and multi-beam depth sounder |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112221917B (en) | 2022-02-18 |
| WO2022048058A1 (en) | 2022-03-10 |
| EP4173728A1 (en) | 2023-05-03 |
| EP4173728A4 (en) | 2024-01-03 |
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