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Acoustic diode and method of using same

A technology of acoustic diodes and acoustic gratings, applied in the field of acoustic diodes and the use of the acoustic diodes, can solve the problems of blocking acoustic waves, lack of making acoustic diodes, obstacles to actual breakthroughs, etc.

Inactive Publication Date: 2018-01-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Acoustic diodes enable sound waves to travel through the diode in a first direction, but prevent sound waves from propagating in the opposite direction
[0002] Although considerable efforts have been made towards demonstrating the acoustic diode concept, barriers have been limited to practical breakthroughs in the field, both theoretically and experimentally.
In particular, there has hitherto been a lack of acoustic diodes that are simple to fabricate and can be made in a small size

Method used

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  • Acoustic diode and method of using same

Examples

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example 1

[0044] Example 1: Brass Acoustic Diode

[0045] The acoustic diode is constructed of brass. The acoustic diode consists of a periodic acoustic grid with multiple grids and a uniform plate. The width and thickness of each grating of the periodic acoustic grating are 1.5 mm and 3 mm, respectively. The distance between adjacent gratings of the periodic acoustic grating is 6mm. The thickness of the uniform plate is 1.5 mm. The uniform plate is separated from the periodic grating by 1.5 mm.

example 2

[0046] Example 2: Acoustic Diode Transmission and Reflection of Sound Waves

[0047] The acoustic diode of Example 1 was immersed in water. The total length of the system including the water area is 20cm. The mass densities of water and brass are 1000kg / m 3 and 8600kg / m 3 . The speed of sound in water is 1498m / s. The longitudinal and transverse velocities of sound in brass are 4000m / s and 2100m / s respectively. Figure 6A The spatial intensity and total displacement field distribution of the acoustic field for an acoustic wave incident on the grid surface of the acoustic diode is schematically illustrated. Such as Figure 6A As shown, a substantial portion of the incident acoustic energy associated with acoustic waves incident on the grid face of the acoustic diode is transmitted through the acoustic diode. Figure 6B The spatial intensity and total displacement field distribution of the acoustic field for an acoustic wave incident on a uniform plate surface of an acoust...

example 3

[0051] Example 3: Ultrasound device with acoustic diode

[0052] The ultrasound device will include an acoustic diode (such as that in Example 1) and an acoustic wave generator. The sound wave generator will operate under the control of a processor which controls the sound wave generator to generate sound waves at specific times and / or at specific frequencies. The processor will be located remotely from the sound wave generator and communicate with the sound wave generator via a wired connection. The processor will also control imaging means, such as a display screen, to provide information to the user based on detection of sound waves at the sensor means.

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PUM

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Abstract

Acoustic diodes, devices incorporating such diodes, and methods of using these devices are disclosed. The acoustic diode may comprise a periodic acoustic grating and a uniform plate. A periodic acoustic grating may comprise a plurality of gratings. The homogeneous plate can be separated from the periodic grating by a resonant cavity. The acoustic diode may be configured to have a first transmission efficiency for acoustic waves incident on the periodic acoustic grating that is greater than a second transmission efficiency for acoustic waves incident on the uniform plate. The sound waves may have wavelengths within a range of wavelengths. Devices incorporating acoustic diodes may include medical imaging devices, such as ultrasound devices, and noise reduction devices.

Description

Background technique [0001] Electrical diodes (components that allow electrical current to flow in only one direction) are common in electrical and computer systems. However, analogues in the acoustic field have been lacking until recently. An acoustic diode enables sound waves to propagate through the diode in a first direction, but prevents sound waves from propagating in the opposite direction. [0002] Although considerable efforts have been made towards demonstrating the acoustic diode concept, barriers have been limited to practical breakthroughs in the field, both theoretically and experimentally. In particular, there has hitherto been a lack of acoustic diodes that are simple to fabricate and can be produced in small sizes. Contents of the invention [0003] This disclosure is not limited to the particular systems, apparatuses and methods described, as these may vary. The terms used in this specification are for the purpose of describing a particular version or im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/25A61B8/00
CPCH03H9/02A61B8/4483G01N29/0654G10K11/18A61B8/14A61B8/4494A61B8/5269
Inventor 梁彬屠娟程建春章东李勇郭霞生
Owner NANJING UNIV
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