Acoustic metasurface
An acoustic metasurface and planar technology, which is applied in the direction of sound-generating devices and instruments, can solve the problems of limited application scenarios, asymmetrical acoustic device volume and mass, and large thickness.
Inactive Publication Date: 2017-09-15
NANKAI UNIV
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Problems solved by technology
Although researchers have made many explorations in the design field of acoustic unidirectional devices in the linear and nonlinear fields in recent years, the current asymmetric devices are still composed of two parts: acoustic mode conversion and acoustic mode selection, which limits the asymmetric Miniaturization of device size
This type of acoustic material has the defects of large thickness and inflexible use, which leads to a relatively thick volume and quality of asymmetric acoustic devices made of this type of material
In addition, in the existing technology, the asymmetric transmission of sound waves can be realized in an active way. This technology needs to receive the sound signal and then convert it into an sound signal after being processed by electronic equipment. An external power supply and signal processing chip are required, so the application scenarios will be limited.
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Embodiment 1
[0044] refer to figure 1 As shown, an acoustic metasurface is provided in this embodiment, and the acoustic metasurface includes: a plurality of first structural units 70 and a plurality of second structural units 80, wherein the first structural units 70 and the second structural units 80 Arrange at intervals on the same plane, and when arranging, make the first slit and the second slit of the first structural unit have the same orientation as the first slit and the second slit of the second structural unit, the first structural unit and the second structural unit interconnected as a whole;
[0045] Here, the above-mentioned first structural unit 70 and the second structural unit 80 may be connected to each other by bonding;
[0046] refer to figure 2 , image 3As shown, the first structural unit and the second structural unit respectively include: an upper plate 20, a lower plate 40, and a side wall 60, and the upper plate 20 and the lower plate 40 are connected as one t...
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The invention provides an acoustic metasurface which comprises a plurality of first structural units and a plurality of second structural units. The first structural units and the second structural units are separately arranged on the same plane and are interconnected for forming an integer. The first structural unit and the second structural unit respectively comprise an upper flat board, a lower flat board and a sidewall. The upper surface of the lower flat board is provided with a plurality of rectangular projected strips which are uniformly arranged. The rectangular projected strips are perpendicular with the sidewall. A certain clearance is reserved between the upper surface of the rectangular projected strip and the lower surface of the upper flat board. The upper flat board is provided with a first gap, and the lower flat board is provided with a second gap. A rectangular projected strip is arranged between the first gap and the second gap of the first structural unit. Three rectangular projected strips are arranged between the first gap and the second gap of the second structural unit. The acoustic metasurface provided by the invention can realize asymmetric transmission of an incident acoustic wave.
Description
technical field [0001] The invention relates to the technical field of acoustic materials, in particular to an acoustic metasurface. Background technique [0002] At present, the asymmetric transmission of sound waves has attracted widespread attention at home and abroad, and it is considered to have potential application prospects, especially in improving the quality of medical ultrasound imaging. Although researchers have made many explorations in the design field of acoustic unidirectional devices in the linear and nonlinear fields in recent years, the current asymmetric devices are still composed of two parts: acoustic mode conversion and acoustic mode selection, which limits the asymmetric Miniaturization of device size. This type of acoustic material has the defects of large thickness and inflexible use, which leads to the relatively thick volume and quality of the asymmetric acoustic device made of this type of material. In addition, in the existing technology, the ...
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IPC IPC(8): G10K11/18
CPCG10K11/18
Inventor 陈树琪谢博阳程化田建国
Owner NANKAI UNIV