CN114101018B - Metamaterial acoustic lens phased array transducer and method for improving focus sound pressure - Google Patents
Metamaterial acoustic lens phased array transducer and method for improving focus sound pressure Download PDFInfo
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- CN114101018B CN114101018B CN202111408114.6A CN202111408114A CN114101018B CN 114101018 B CN114101018 B CN 114101018B CN 202111408114 A CN202111408114 A CN 202111408114A CN 114101018 B CN114101018 B CN 114101018B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000004793 Polystyrene Substances 0.000 claims description 25
- 229920002223 polystyrene Polymers 0.000 claims description 18
- 239000004814 polyurethane Substances 0.000 claims description 16
- 229920002635 polyurethane Polymers 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 16
- 238000002604 ultrasonography Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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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
- B06B1/0607—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 multiple elements
- B06B1/0622—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 multiple elements on one surface
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
The invention relates to a metamaterial acoustic lens phased array transducer and a method for improving focus sound pressure. Including phased array ultrasonic transducer and be located the dismantled and assembled ultrasonic material sound lens of phased array ultrasonic transducer top, through dismantled and assembled ultrasonic material sound lens for when phased array ultrasonic transducer focus deflected, the accessible changed the inner structure of ultrasonic material sound lens and realized that the focus position changed along with phased array ultrasonic transducer focus position, thereby realized the promotion of focus acoustic pressure under the condition of sidelobe acoustic pressure not increased when the acoustic focus deflected. The ultrasonic material acoustic lens is added on the phased array ultrasonic transducer, so that the acoustic focus sound pressure is improved; meanwhile, the ultrasonic material acoustic lens can be disassembled and assembled, so that when the focal point of the phased array ultrasonic transducer deflects, the focal point position can be changed along with the focal point position of the phased array ultrasonic transducer by changing the internal structure of the ultrasonic material acoustic lens, and the promotion of the focal point sound pressure is realized under the condition that the side lobe sound pressure is not increased when the acoustic focal point deflects.
Description
Technical Field
The invention relates to a metamaterial acoustic lens phased array transducer and a method for improving focus sound pressure.
Background
In some application techniques of ultrasound, ultrasound focusing must be used in order to obtain high ultrasound intensity or to concentrate ultrasound energy to a certain area. The existing ultrasonic focusing mode mainly adopts acoustic lens focusing, self-focusing and phased array focusing, and the problems and defects of the existing ultrasonic focusing mode mainly comprise:
1) The focus sound energy is insufficient;
2) The focal position is fixed or can only be changed by a mechanical device;
3) When the focus is deflected, side lobes with large sound pressure appear around the main lobe.
Disclosure of Invention
The invention aims to solve the problems that the ultrasonic focusing focus has insufficient acoustic energy, the focus position is fixed or the focus position can only be changed by a mechanical device, and side lobes with larger sound pressure appear around a main lobe when the focus deflects, and provides a metamaterial acoustic lens phased array transducer and a method for improving the sound pressure of the focus.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides an ultrasonic material sound lens phased array transducer, includes phased array ultrasonic transducer and is located the dismantled and assembled ultrasonic material sound lens of phased array ultrasonic transducer top, through dismantled and assembled ultrasonic material sound lens for when phased array ultrasonic transducer focus deflected, the accessible changed the inner structure of ultrasonic material sound lens and realized focus position and follow phased array ultrasonic transducer focus position change, thereby realized the promotion of focus acoustic pressure under the condition of sidelobe acoustic pressure not increased when the acoustic focus deflected.
In an embodiment of the invention, the phased array ultrasonic transducers are piezoelectric ceramics arranged in an array according to a predetermined mode; the metamaterial acoustic lens takes a polystyrene matrix as a main body, and grooves are uniformly distributed on the polystyrene matrix.
In an embodiment of the present invention, the grooves of different rings are filled with polyurethane and polystyrene with different height ratios.
When the metamaterial acoustic lens phased array transducer is used, polyurethane and polystyrene with different height proportions are filled in grooves of different circles, so that phase difference is generated when sound waves incident into the grooves of different circles in the same phase are emitted, the influence of the phase difference caused by the fact that part of the sound waves reach different focus sound paths is eliminated, and the focus sound pressure is improved by utilizing the interference effect of the sound waves.
In an embodiment of the present invention, when the acoustic focus is not deflected, that is, the focus is on the acoustic axis, the height ratio of the polystyrene is gradually decreased from the outermost groove to the innermost groove, and the height ratio of the polyurethane is gradually increased; when the acoustic focus deviates from the acoustic axis, namely the focus position deflects, the groove of the metamaterial acoustic lens at the position corresponding to the focus is regarded as the innermost ring, the height proportion of the polystyrene is gradually reduced from the outermost ring groove to the innermost ring groove, and the height proportion of the polyurethane is gradually increased, so that the focus sound pressure is improved under the condition that the side lobe sound pressure is not increased during the deflection of the acoustic focus.
Compared with the prior art, the invention has the following beneficial effects:
1) The main lobe sound pressure of the sound focus is effectively improved;
2) The position of the acoustic focus is changed in space without the aid of complex mechanical structures;
3) When the acoustic focus deflects in space, the sound pressure of the main lobe is effectively improved, and the sound pressure of the side lobe is reduced.
The application of the invention is as follows: the metamaterial acoustic lens phased array transducer can be used for medical treatment, VR tactile feedback and ultrasonic control.
Drawings
FIG. 1 is a schematic diagram of the metamaterial acoustic lens phased array transducer structure of the present invention.
FIG. 2 is a top view of a metamaterial acoustic lens phased array transducer of the present invention.
Fig. 3 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of fig. 2 with the acoustic focus undeflected.
Fig. 4 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of the acoustic focus of fig. 2 as it is deflected.
In the figure: 1-piezoelectric ceramic, 2-polystyrene matrix, 3-groove, 4-polystyrene and 5-polyurethane.
Detailed Description
The technical scheme of the invention is specifically explained in the following by combining the attached drawings.
The invention relates to an ultrasonic material acoustic lens phased array transducer, which comprises a phased array ultrasonic transducer and a detachable ultrasonic material acoustic lens positioned above the phased array ultrasonic transducer, wherein when a focus of the phased array ultrasonic transducer deflects through the detachable ultrasonic material acoustic lens, the change of the focus position along with the change of the focus position of the phased array ultrasonic transducer can be realized by changing the internal structure of the ultrasonic material acoustic lens, so that the focus sound pressure is improved under the condition that the side lobe sound pressure is not increased when the sound focus deflects. The phased array ultrasonic transducer is formed by arranging piezoelectric ceramics 1 in an array mode according to a preset mode; the metamaterial acoustic lens takes a polystyrene substrate 2 as a main body, and grooves 3 are uniformly distributed on the polystyrene substrate. And the grooves of different circles are filled with polyurethane 5 and polystyrene 4 with different height ratios.
When the metamaterial acoustic lens phased array transducer is used, polyurethane and polystyrene with different height proportions are filled in grooves of different circles, so that phase difference is generated when sound waves incident into the grooves of different circles in the same phase are emitted, the influence of the phase difference caused by the fact that part of the sound waves reach different focus sound paths is eliminated, and the focus sound pressure is improved by utilizing the interference effect of the sound waves.
The following is a specific implementation process of the present invention.
The invention relates to a phased array transducer of an ultrasonic material acoustic lens, which mainly comprises a phased array ultrasonic transducer and an ultrasonic material acoustic lens. The phased array ultrasonic transducer is formed by piezoelectric ceramics which are arranged in an array mode; the metamaterial acoustic lens takes a Polystyrene (PS) matrix as a main body, and grooves are uniformly distributed on the Polystyrene (PS) matrix. When the novel plastic rubber ring is used, the grooves of different rings are filled with Polyurethane (PU) and Polystyrene (PS) with different height ratios. Because the sound velocities of Polystyrene (PS) and Polyurethane (PU) are different, phase difference is generated when sound waves incident into grooves of different circle layers in the same phase are emitted; the phase difference can eliminate the influence of the phase difference caused by different sound paths from part of sound waves to the focus, thereby realizing the improvement of the focus sound pressure by utilizing the interference effect of the sound waves.
1. As shown in fig. 2 and 3, when the acoustic focus is not deflected, that is, the focus is on the acoustic axis, since the sound velocity of Polystyrene (PS) is relatively high, the height ratio of Polystyrene (PS) is gradually decreased from the outermost groove to the innermost groove, and the height ratio of Polyurethane (PU) is gradually increased.
2. As shown in fig. 2 and 4, when the acoustic focus is displaced from the acoustic axis, i.e., the focus position is deflected. The groove of the metamaterial acoustic lens at the position corresponding to the focus is regarded as the innermost circle. Correspondingly, the height proportion of Polyurethane (PU) filled in the grooves of the areas is the largest, the height proportion of the Polyurethane (PU) from the innermost circles to the outermost circles is gradually reduced, and the height proportion of the Polystyrene (PS) is gradually increased.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (3)
1. The phased array transducer of the ultrasonic lens is characterized by comprising a phased array ultrasonic transducer and a detachable ultrasonic lens located above the phased array ultrasonic transducer, wherein when a focus of the phased array ultrasonic transducer deflects through the detachable ultrasonic lens, the change of the focus position along with the change of the focus position of the phased array ultrasonic transducer can be realized by changing the internal structure of the ultrasonic lens, so that the focus sound pressure is improved under the condition that the side lobe sound pressure is not increased when the sound focus deflects; the phased array ultrasonic transducer is piezoelectric ceramics and is arranged in an array mode according to a preset mode; the metamaterial acoustic lens takes a polystyrene matrix as a main body, and grooves are uniformly distributed on the polystyrene matrix; and the grooves of different rings are filled with polyurethane and polystyrene with different height proportions.
2. The method for improving the focus sound pressure of the metamaterial acoustic lens phased array transducer as claimed in claim 1, wherein when the metamaterial acoustic lens phased array transducer is used, the grooves of different circles are filled with polyurethane and polystyrene with different height ratios, so that the sound waves incident into the grooves of different circles in the same phase are emitted to generate a phase difference to eliminate the influence of the phase difference caused by the fact that a part of the sound waves reach different focus sound paths, and the focus sound pressure is improved by utilizing the interference effect of the sound waves.
3. The method of claim 2, wherein when the acoustic focus is not deflected, that is, the focus is on the acoustic axis, the height ratio of polystyrene gradually decreases from the outermost groove to the innermost groove, and the height ratio of polyurethane gradually increases; when the acoustic focus deviates from the acoustic axis, namely the focus position deflects, the groove of the metamaterial acoustic lens at the position corresponding to the focus is regarded as the innermost ring, the height proportion of the polystyrene is gradually reduced from the outermost ring groove to the innermost ring groove, and the height proportion of the polyurethane is gradually increased, so that the focus sound pressure is improved under the condition that the side lobe sound pressure is not increased during the deflection of the acoustic focus.
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| CN202111408114.6A CN114101018B (en) | 2021-11-25 | 2021-11-25 | Metamaterial acoustic lens phased array transducer and method for improving focus sound pressure |
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