CN116511014A - Single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume - Google Patents
Single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume Download PDFInfo
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- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- 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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Abstract
The invention discloses a single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume, which comprises a transducer shell, wherein one end of the transducer shell is provided with a prismatic baffle, the surface of the prismatic baffle is provided with a multi-array element piezoelectric layer, the multi-array element piezoelectric layer is provided with a changeable sound-transmitting rubber, a projection surface of the multi-array element piezoelectric layer is round, the projection surface is divided into three concentric rings, the projection surface is arranged in a single-frequency/double-frequency curved surface split array mode of m+n+k, the projection surfaces of m, n and k arrays are three concentric rings, different resonant frequencies are obtained through driving different arrays, and the invention provides a split array phase regulation and control mode for changing the focal domain volume of the sound field and a focusing vortex topology load regulation mode, a multiple vortex regulation mode for controlling the force field, and a double-frequency split array and vortex regulation mode for cavitation intensity and distribution efficiency.
Description
Technical Field
The invention relates to the technical field of ultrasonic transducers, in particular to a single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume.
Background
As a non-invasive treatment method, the focused ultrasound treatment has the advantages of no wound, effectiveness, safety, quick recovery after treatment, no radioactive injury and the like. The medium-low intensity focused ultrasonic treatment utilizes the mechanical vibration effect of ultrasonic waves to trigger the movement of substances in tissue cells, promotes blood circulation, accelerates metabolism, reduces the tension of muscles and connective tissues to reduce the excitability of nerves through the warm effect, combines cavitation to realize the change of cell functions, enhances vascular permeability, helps patients to recover, and achieves the aim of treatment. Therefore, the medium-low intensity focused ultrasound therapy is widely applied to the fields of pain relief, musculoskeletal therapy, tumor therapy, blood brain barrier opening, nerve regulation and control and the like.
The common focusing ultrasonic therapeutic transducer is single-frequency, and under the same acoustic power, the double-frequency focusing ultrasonic transducer has higher cavitation activity intensity than single-frequency, and inertial cavitation is easier to occur, so that the temperature rise can be obviously improved, the treatment duration can be shortened, and the treatment efficiency can be improved. The dual-frequency focusing ultrasonic transducer sold in the market at present is the simple combination of two single-frequency focusing ultrasonic therapeutic transducers with different frequencies, in experimental research, the dual-frequency is realized by obtaining new frequencies through superposition of excitation signals, the dual-frequency confocal concave spherical focusing ultrasonic transducer with two array elements is also designed, the dual-frequency focusing is realized through superposition of excitation signals or the combination of multiple confocal transducers, the driving of a multiple function generator and a power amplifier is required, the cost is greatly increased, and the dual-frequency focusing ultrasonic transducer cannot be applied to the structure of the multi-array element transducer. In order to realize the structural integration of the dual-frequency focusing therapeutic transducer, the thicknesses of an excitation layer and a matching layer are designed by mechanically combining two layers of piezoelectric ceramic materials, so that the fundamental frequencies of the two excitation layers are close.
Disclosure of Invention
The invention aims to provide a single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume, which is used for solving the problems of low cavitation activity intensity, difficult occurrence of inertial cavitation and slow temperature rise in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume comprises a transducer shell, wherein a prismatic baffle is arranged at one end of the transducer shell, a multi-array element piezoelectric layer is arranged on the surface of the prismatic baffle, and a variable sound-transmitting rubber is arranged on the multi-array element piezoelectric layer;
dividing the projection plane into three concentric rings by using a multi-array element piezoelectric layer projection plane, and arranging the three concentric rings in an m+n+k single-frequency/double-frequency curved surface split array mode, wherein the projection planes of m, n and k arrays are all integer numbers;
the single-frequency/double-frequency curved surface split array type arrangement comprises a structure of adopting a self-focusing concave piezoelectric material to cut and integrating into three circular rings of m, n and k, so as to ensure that the curvature radiuses of m, n and k arrays are consistent, or a plane piezoelectric material is selected, the projection line segments of all array elements in the m and n arrays are chords of a circle with radius=R, and the curvature radiuses of curved surfaces corresponding to the m, n and k arrays are consistent.
Preferably, the multi-array element piezoelectric layer adopts PZT-4 piezoelectric ceramics or PZT-8 piezoelectric ceramics.
Preferably, the PZT-4 or PZT-8 piezoelectric ceramic has a thickness less than 3mm.
Preferably, the end of the transducer housing remote from the prismatic baffle is capable of being held by hand or mated with a robotic arm.
Preferably, the m-array is a fundamental frequency, the n-array is a frequency multiplication, and the k-array is a double frequency.
Preferably, the single split arrays of the multi-array element piezoelectric layer are closely arranged in the form of 8+4+4 or 8+4+1.
Preferably, positive and negative leads are arranged on the lower surface of the multi-array element piezoelectric layer, each split array is matched with a power amplification plate, and different resonant frequencies are obtained by driving m and n arrays respectively or driving m and n arrays simultaneously.
Preferably, the sound-transmitting rubber material of the deformable sound-transmitting rubber layer is natural rubber.
Preferably, castor oil is filled between the multi-element piezoelectric layer and the deformable acoustically transparent rubber.
Preferably, the transducer housing is internally provided with an electro-mechanical connection.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a single/double frequency array transducer for multiple regulation of sound field and focal domain volume, comprising a transducer shell, wherein one end of the transducer shell is provided with a prismatic baffle, the surface of the prismatic baffle is provided with a multi-array element piezoelectric layer, the multi-array element piezoelectric layer is provided with a changeable sound-transmitting rubber, the projection surface of the multi-array element piezoelectric layer is round, the projection surface is divided into three concentric rings, the three concentric rings are arranged in a single-frequency/double-frequency curved surface splitting array mode of m+n+k, the projection surfaces of m, n and k arrays are three concentric rings, different resonant frequencies are obtained by driving different arrays, meanwhile, due to the single-frequency/double-frequency curved surface splitting array mode arrangement mode, a self-focusing concave piezoelectric material is adopted for cutting, the structure of m, n and k rings is integrated, the curvature radiuses of m, n and k arrays are guaranteed to be consistent, confocal is achieved, or plane piezoelectric materials are selected, projection line segments of all array elements in the m, n arrays are chords of circles with radius=R, the curvature radiuses of curved surfaces corresponding to the m, n and k arrays are consistent, confocal is achieved, a split array phase regulation and focusing vortex topological load regulation mode for changing the focal domain volume of a sound field, a multiple vortex sound field regulation mode for controlling a force field, a double-frequency split array and vortex regulation mode for enhancing cavitation intensity and distribution are provided, and the mode can enhance cavitation activity intensity, inertial cavitation is easier to occur and temperature is fast.
Further, the sound-transmitting rubber material of the deformable sound-transmitting rubber layer is natural rubber, the sound-transmitting effect is good, the natural rubber can effectively resist castor oil, and meanwhile, the deformable sound-transmitting rubber layer has good deformation capacity due to the adoption of the natural rubber, can be tightly attached to a body surface, and is suitable for use at different positions. .
Furthermore, the multi-array element piezoelectric layer adopts PZT-4 piezoelectric ceramic or PZT-8 piezoelectric ceramic as raw materials, and has the advantages of stronger and stable piezoelectric performance, high Curie temperature, large anisotropism, small dielectric constant and the like;
further, the end of the transducer shell far away from the prismatic baffle plate can be held by hand, and compared with the limitations of the prior focused ultrasonic therapeutic transducer, such as large volume and use scene, the operation is more flexible, the use field Jing Duobian can be combined with the mechanical arm for use, and the defect of manpower is overcome.
Drawings
FIG. 1 is a schematic diagram of a single/dual frequency array transducer structure for multiple modulation of sound field and focal domain volume in accordance with the present invention;
FIG. 2 is a schematic diagram of a single/dual frequency array transducer for multiple regulation of sound field and focal domain volume using a multi-array element piezoelectric layer m+n+k of self-focusing concave piezoelectric material and a rear prismatic baffle structure according to the present invention;
FIG. 3 is a schematic diagram of a structure of a multi-array element piezoelectric layer m+n+k and a rear prismatic baffle of a single/dual frequency array transducer for multiple regulation of sound field and focal domain volume using planar piezoelectric material according to the present invention;
FIG. 4 is a schematic cross-sectional view of a chord projected as radius=R for a multi-array element piezoelectric layer m, n, and k array of a single/dual frequency array transducer for acoustic field and focal domain volume multiplexed modulation of the present invention;
FIG. 5 is a schematic diagram of an arrangement of a piezoelectric layer of multiple array elements using planar piezoelectric material for a single/dual frequency array transducer for multiple regulation of sound field and focal volume according to the present invention, wherein a is 8+4+1, and b is 8+4+4;
FIG. 6 is a schematic diagram of a feedback control flow for a single/dual frequency array transducer for multiple modulation of sound field and focal zone volume in accordance with the present invention;
FIG. 7 is a schematic diagram of a focused transverse sound field simulation at 800kHz for single/dual frequency array transducer frequency for multiple modulation of sound field and focal zone volume in accordance with the present invention;
FIG. 8 is a schematic diagram of a focused transverse sound field simulation of the invention for single/dual frequency array transducer frequency 800kHz, topology charge 1, and phase difference pi/4 between adjacent array elements for multiple regulation of sound field and focal domain volume;
FIG. 9 is a schematic diagram of a focused transverse sound field simulation with a single/dual frequency array transducer frequency of 800kHz, a topological charge of 2, and a phase difference pi/2 between adjacent array elements for multiple regulation of sound field and focal domain volume;
wherein, 1-multi-array element piezoelectric layer, 2-deformable sound-transmitting rubber, 3-prismatic baffle plate and 4-transducer shell.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
As shown in fig. 1, the invention provides a single/double-frequency array transducer for multiple regulation of sound field and focal domain volume, which is designed by optimally designing the arrangement form of single array elements of a piezoelectric layer of the transducer. The change of sound pressure and cavitation intensity is realized by driving a single array or driving all arrays simultaneously to obtain different frequencies. The phase difference between adjacent array elements of the designed transducer array is adjustable, whether a vortex sound field is generated or not is controlled, and the size of topological charges is changed so as to change the size of sound radiation force and the size of focal domain volume. In addition, the designed transducer can be used in combination with a receiving transducer, and the real-time monitoring and adjustment of the amplitude and the phase of the sound field are realized through a feedback control network. The transducer designed by the invention can be manually held for treatment in use in consideration of the flexibility of operation, and can also be used in combination with a mechanical arm to make up for the shortage of manpower.
The transducer structure comprises a multi-array element piezoelectric layer, deformable sound-transmitting rubber and a coupling medium, wherein a prismatic baffle plate and a transducer shell are arranged in the transducer shell, the transducer shell is a handheld type, the limitations of a large volume and a use scene of the traditional focused ultrasonic therapeutic transducer are distinguished, the operation is more flexible, a field Jing Duobian is used, the transducer structure can be combined with a mechanical arm to be used, the defect of manpower is overcome, the multi-array element piezoelectric layer 1 is placed on the upper surface of the prismatic baffle plate 3, positive and negative leads of the multi-array element piezoelectric layer 1 are placed on the lower surface, the prismatic baffle plate is in a hollow design in the middle, and the leads are convenient to be connected.
The piezoelectric layer 1 with multiple array elements has stronger and stable piezoelectric performance, high Curie temperature, large anisotropism and small dielectric constant due to the PZT piezoelectric ceramic in material selection, the piezoelectric layer with multiple array elements can be PZT-4 piezoelectric ceramic or PZT-8 piezoelectric ceramic, and the PZT-4 and PZT-8 have strong reverse depolarization capability and low dielectric loss under high voltage drive, so that the piezoelectric layer is more suitable for deep immersion acoustic sensors, and the thickness is less than 3mm.
The projection plane of the multi-array element piezoelectric layer is a circle and is divided into three concentric circles, and the three concentric circles are arranged in a single-frequency/double-frequency curved surface splitting array mode of m+n+k (m, n, k E Z+), wherein the projection planes of m, n and k arrays are the three concentric circles.
The multi-array element piezoelectric layer can adopt self-focusing concave piezoelectric materials for cutting and then integrate the self-focusing concave piezoelectric materials into three circular structures of m, n and k, so that the curvature radiuses of m, n and k arrays are ensured to be consistent, and confocal is realized; the plane piezoelectric material can be selected, and the projection line segments of all array elements in the m and n arrays are chords of a circle with radius=R, so that the curvature radiuses of curved surfaces corresponding to the m and n arrays are consistent, and confocal is realized.
The single split arrays of the multi-array element piezoelectric layer are closely arranged, and the arrangement form can be 8+4+4,8+4+1.
The array frequency of the multi-array element piezoelectric layer has various selection modes, and the alternative scheme is that m arrays are fundamental frequencies, n arrays are frequency multiplication, and k arrays are double frequencies.
Positive and negative leads of the multi-array element piezoelectric layer are arranged on the lower surface, each split array is matched with a power amplification plate, different resonant frequencies are obtained by driving m and n arrays respectively or driving m and n arrays simultaneously, and when m and n arrays are driven simultaneously, sound pressure is enhanced and cavitation is enhanced.
The phase difference of adjacent array elements of a single array in the multi-array element piezoelectric layer is changed, the phase difference is adjustable, whether vortex is formed or not is controlled, the topological load is changed, and therefore the sound radiation force and focal domain are changed.
The k array of the multi-element piezoelectric layer can be either one of the arrays of therapeutic transducers or a broadband receiving transducer. In the case of a broadband receiving transducer, there is a backing. The device can receive subharmonic signals and high-frequency band broadband noise, and can characterize steady cavitation dosage and inertial cavitation dosage after data are processed, and real-time monitoring and adjusting of the amplitude and the phase of a sound field are realized through a feedback control network.
The sound-transmitting rubber material of the deformable sound-transmitting rubber layer is NR, the sound transmission coefficient T is more than 96% at 5-55 kHz, the NR can effectively resist castor oil, and castor oil is filled between the transducer piezoelectric layer and the sound-transmitting rubber. The deformable sound-transmitting rubber layer has good deformability, can be closely attached to the body surface, and is suitable for use in different positions.
As shown in fig. 2 and fig. 3, the projection plane of the multi-array element piezoelectric layer is a circle, and is divided into three concentric circles, and the three concentric circles are arranged in a single-frequency/double-frequency curved surface split array mode of m+n+k (m, n, k e z+), and the projection planes of m, n and k arrays. Further, in the aspect of structure selection, the multi-array element piezoelectric layer can be cut by adopting a self-focusing concave piezoelectric material and then is integrated into a structure of m, n and k rings, as shown in fig. 2, the curvature radiuses of m, n and k arrays are ensured to be consistent, and confocal is realized; alternatively, plane piezoelectric materials may be selected, as shown in fig. 3, where projection line segments of all array elements in the m and n arrays are chords of circles with radius=r, as shown in fig. 4, so that curvature radii of curved surfaces corresponding to the m and n arrays are consistent, and confocal is achieved.
The individual split arrays are closely arranged as shown in fig. 5 and may be, but are not limited to, 8+8+4,8+8+1. The array frequency of the multi-array element piezoelectric layer has various selection modes, and the alternative scheme comprises m arrays as fundamental frequency, n arrays as frequency multiplication and k arrays as double frequency.
Each split array is matched with one power amplifying plate, when the split array is driven, m or n arrays can be independently driven, and m and n arrays can be simultaneously driven, so that three resonant frequencies can be obtained by the same transducer. When the m and n arrays are driven simultaneously, sound pressure is enhanced and cavitation is enhanced. The phase difference of adjacent array elements of a single array in the multi-array element piezoelectric layer is changed, the phase difference is adjustable, whether vortex is formed or not is controlled, the topological load is changed, and therefore the sound radiation force and focal domain are changed. The transducer is suitable for different target treatments, and the application range is enlarged.
The k array of the multi-array element piezoelectric layer can be one of the arrays of therapeutic transducers or can be a broadband receiving transducer. In the case of a broadband receiving transducer, there is a backing. The device can receive subharmonic signals and high-frequency band broadband noise, and can characterize steady cavitation dosage and inertial cavitation dosage after data processing, and the device can realize real-time monitoring and adjustment of the amplitude and the phase of a sound field through a feedback control network as shown in fig. 6.
When the phase difference of m array adjacent array elements of the multi-array element piezoelectric layer is 0 and the topological charge is 0, the transducer is a non-vortex focusing ultrasonic transducer, the simulation result of the transverse sound field is shown in fig. 7, the sound pressure at the focus is strongest, and the sound pressure gradually decreases to the periphery of the focus area. When the m array topology charge of the multi-array element piezoelectric layer is 1, the transducer is a vortex focusing ultrasonic transducer, the simulation result of the transverse sound field is shown in fig. 8, and the sound pressure of the focus center area is 0. The topology load of fig. 9 is set to 2, the other simulation parameters are consistent with those of fig. 8, and comparing the two results shows that when the other parameters are kept the same, the sound pressure peak value is reduced along with the increase of the topology load, and the range of the sound potential well is increased along with the increase of the topology load, and the sound control range is larger. By changing the size of the topological charge, the dual regulation and control of the size of the sound field and the focal domain volume are realized.
The transducer housing is hand-held and may also be used in combination with a robotic arm.
The invention has the following advantages:
a, by optimizing the arrangement form of the split array of the piezoelectric layer of the transducer, the self-focusing concave piezoelectric material can be adopted for cutting in structural selection, and then the piezoelectric material is integrated into a structure of m, n and k rings, so that the curvature radiuses of the m, n and k arrays are ensured to be consistent, and confocal is realized; the plane piezoelectric material can be selected, and the projection line segments of all array elements in the m and n arrays are chords of a circle with radius=R, so that the curvature radiuses of curved surfaces corresponding to the m and n arrays are consistent, and confocal is realized.
And b, respectively driving m and n arrays or simultaneously driving m and n arrays to obtain different resonant frequencies, so that the transducer can work at a plurality of working frequencies, is suitable for different target processing, and expands the application range.
And c, controlling whether vortex is formed or not and changing the topological load size by changing the phase difference of adjacent array elements of a single array in the multi-array element piezoelectric layer and adjusting the phase difference, so that the sound radiation force size and the focal domain size are conveniently changed.
d, the receiving transducer is double-frequency, stable cavitation and inertial cavitation dosage can be obtained simultaneously after data are processed, and the real-time monitoring and adjustment of the amplitude and the phase of the sound field are realized by combining a feedback control network.
And e, the transmitting transducer and the receiving transducer are integrated, so that the operation is more flexible and convenient.
f, the transducer is mounted with deformable sound-transmitting rubber, and is tightly attached to the tested surface.
And g, the transducer shell is handheld, so that the limitations of the use scene of the traditional focused ultrasonic therapeutic transducer are distinguished, the operation is more flexible, the use field Jing Duobian can be combined with the mechanical arm, and the defect of manpower is overcome.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, which are merely illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may make many forms without departing from the scope of the invention as claimed.
Claims (10)
1. The single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume is characterized by comprising a transducer shell (4), wherein one end of the transducer shell (4) is provided with a prismatic baffle (3), the surface of the prismatic baffle (3) is provided with a multi-array element piezoelectric layer (1), and the multi-array element piezoelectric layer (1) is provided with a variable sound-transmitting rubber (2);
the projection surface of the multi-array element piezoelectric layer (1) is a circle, the projection surface is divided into three concentric circles, the three concentric circles are arranged in a single-frequency/double-frequency curved surface split array mode of m+n+k, the projection surfaces of m, n and k arrays are three concentric circles, and the m, n and k arrays are all integer numbers;
the single-frequency/double-frequency curved surface split array type arrangement comprises a structure of adopting a self-focusing concave piezoelectric material to cut and integrating into three circular rings of m, n and k, so as to ensure that the curvature radiuses of m, n and k arrays are consistent, or a plane piezoelectric material is selected, projection line segments of all array elements in the m, n arrays are chords of a circle with radius=R, and the curvature radiuses of curved surfaces corresponding to the m, n and k arrays are consistent.
2. A single/dual frequency array transducer for acoustic field and focal domain volume multiplexed control as claimed in claim 1 wherein said multi-element piezoelectric layer (1) is PZT-4 piezoelectric ceramic or PZT-8 piezoelectric ceramic.
3. A single/dual frequency array transducer for acoustic field and focal domain volume multiplexed steering as claimed in claim 2 wherein said PZT-4 or PZT-8 piezoceramic is less than 3mm thick.
4. A single/dual frequency array transducer for sound field and focal domain volume multiplex regulation according to claim 1, characterized in that the end of the transducer housing (4) remote from the prismatic baffle (3) can be held by hand or co-operating with a robotic arm.
5. A single/dual frequency array transducer for multiple modulation of sound field and focal zone volume according to claim 1 wherein the m-array is fundamental frequency, the n-array is frequency multiplication, and the k-array is dual frequency.
6. A single/dual frequency array transducer for acoustic field and focal domain volume multiplexed control as claimed in claim 1 wherein the individual split arrays of the multi-element piezoelectric layer (1) are closely arranged in the form of 8+4+4 or 8+4+1.
7. The single/double frequency array transducer for multiple regulation of sound field and focal domain volume according to claim 6, wherein the lower surface of the multi-array element piezoelectric layer (1) is provided with positive and negative leads, each split array is matched with a power amplification plate, and different resonance frequencies are obtained by driving m and n arrays respectively or driving m and n arrays simultaneously.
8. A single/dual frequency array transducer for sound field and focal domain volume multiplexed control according to claim 1, characterized in that the acoustically transparent rubber material of the deformable acoustically transparent rubber layer (2) is natural rubber.
9. A single/dual frequency array transducer for acoustic field and focal domain volume multiplexed control according to claim 1, characterized in that castor oil is filled between the multi-element piezoelectric layer (1) and the deformable acoustically transparent rubber (2).
10. A single/dual frequency array transducer for acoustic field and focal domain volume multiplexed steering according to claim 1, said transducer housing (4) internally provided with electro-mechanical connections.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310597036.1A CN116511014A (en) | 2023-05-24 | 2023-05-24 | Single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310597036.1A CN116511014A (en) | 2023-05-24 | 2023-05-24 | Single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume |
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| CN116511014A true CN116511014A (en) | 2023-08-01 |
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| CN202310597036.1A Pending CN116511014A (en) | 2023-05-24 | 2023-05-24 | Single/double-frequency array transducer for multiple regulation and control of sound field and focal domain volume |
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