CN105974766B - A kind of Meta Materials of the achievable acoustic holography based on phase amplitude modulation - Google Patents
A kind of Meta Materials of the achievable acoustic holography based on phase amplitude modulation Download PDFInfo
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- CN105974766B CN105974766B CN201610327720.8A CN201610327720A CN105974766B CN 105974766 B CN105974766 B CN 105974766B CN 201610327720 A CN201610327720 A CN 201610327720A CN 105974766 B CN105974766 B CN 105974766B
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- outer tunnel
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H3/00—Holographic processes or apparatus using ultrasonic, sonic or infrasonic waves for obtaining holograms; Processes or apparatus for obtaining an optical image from them
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Abstract
The invention discloses a kind of Meta Materials of the achievable acoustic holography based on phase amplitude modulation, including substrate, the substrate is equipped with the n × m units for running through substrate, n represents n rows, n is positive integer, m represents m row, m is positive integer, each unit, which includes, is equipped with the first coaxial outer tunnel, intermediate channel and the second outer tunnel, first outer tunnel, the shape of cross section of intermediate channel and the second outer tunnel is square, the length of side of first outer tunnel and the second outer tunnel cross section is λ/5, the side size range of middle outer tunnel cross section arrives λ/5 for 0, the thickness of the substrate is λ, the altitude range of first outer tunnel is λ/5 of λ/10 to 3, λ is the wavelength of incident acoustic wave.The Meta Materials of the achievable acoustic holography based on phase amplitude modulation of the present invention, the inside radius of intermediate channel is in 0 to λ/5 changes, to realize different reflected amplitudes, realize different reflected phases in the position for changing intermediate channel, can at the same time modulating wave phase and amplitude, for acoustic holography be imaged.
Description
Technical field
The present invention relates to the Meta Materials for the achievable acoustic holography modulated based on phase amplitude, belong to field of acoustics.
Background technology
Optical holographic imaging is a widely-known technique, and acoustic holography imaging is analogous to optical holographic, can manipulate
Sound field forms the shape pre-seted in specific imaging plane.This brand-new technology is possibly used for sound field redistribution, ultrasonic therapy
With architectural acoustics field.Acoustic holography is technically similar with optics, it is necessary to the phase and amplitude of modulating wave at the same time, and conventional acoustic
Meta Materials or super surface often can only solely voicing ripple phase.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of based on phase amplitude modulation
Achievable acoustic holography Meta Materials, by adjusting the length of side of intermediate channel and the position of intermediate channel, can modulate at the same time
The phase and amplitude of ripple, are imaged for acoustic holography.
Technical solution：A kind of in order to solve the above technical problems, achievable acoustics based on phase amplitude modulation of the present invention
Holographic Meta Materials, including substrate, the substrate are equipped with the n × m units for running through substrate, and n represents n rows, and n is positive integer, m
Represent m row, m is positive integer, and each unit, which includes, is equipped with coaxial the first outer tunnel, intermediate channel and the second outer tunnel, middle
Passage between the first outer tunnel and the second outer tunnel, first outer tunnel, intermediate channel and the second outer tunnel it is transversal
Face shape is square, and the length of side of the first outer tunnel and the second outer tunnel cross section is λ/5, middle outer tunnel cross section
Side size range arrive λ/5 for 0, and the thickness of the substrate is λ, and the altitude range of first outer tunnel is the λ/5 of λ/10 to 3, λ be into
Penetrate the wavelength of sound wave.
Preferably, the acoustic impedance of the substrate is at least the acoustic impedance of 100 times of air.
Preferably, the center position of two neighboring unit is p=λ/4.
Preferably, the direction of propagation of the incident acoustic wave and the angle of substrate surface are 45 °.
Beneficial effect：The Meta Materials of the achievable acoustic holography based on phase amplitude modulation of the present invention, intermediate channel
Inside radius is in 0 to λ/5 change, to realize different reflected amplitudes, changes the position of intermediate channel to realize different reflection phases
Position, can at the same time modulating wave phase and amplitude, for acoustic holography be imaged.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the structure diagram of unit in Fig. 1.
Fig. 4 is the Longitudinal cross section schematic of unit in Fig. 1.
Fig. 5 is the position of intermediate channel and reflected phase relation in unit.
Fig. 6 is the length of side w of intermediate channel and reflected amplitude relation in unit.
Fig. 7 is acoustic holography imaging schematic diagram.
" N " " J " " U " three alphabetical numerical simulation results are realized in Fig. 8 holographic imagings.
Embodiment
As shown in Figures 1 to 4, the Meta Materials of a kind of achievable acoustic holography based on phase amplitude modulation of the invention,
Including substrate 1, the acoustic impedance of the substrate 1 is at least the acoustic impedance of 100 times of air, and the substrate 1 is equipped with n × m
A unit through substrate 1, n represent n rows, and n is positive integer, and m represents m row, and m is positive integer, and the present invention is preferably m=n=19,
Unit in substrate 1 is uniformly distributed, and the distance of two neighboring unit center position is p=λ/4, and each unit, which includes, to be equipped with coaxially
The first outer tunnel, intermediate channel and the second outer tunnel, intermediate channel is described between the first outer tunnel and the second outer tunnel
The shape of cross section of first outer tunnel, intermediate channel and the second outer tunnel is square, the first outer tunnel and the second outer tunnel
The length of side of cross section is d=λ/5, and the length of side w scopes of middle outer tunnel cross section arrive λ/5 for 0, and the thickness of the substrate 1 is h
=λ, the height h of first outer tunnel1Scope is the λ/5 of λ/10 to 3, and λ is the wavelength of incident acoustic wave.
Fig. 5 shows position (the intermediate channel upper surface to the first outer tunnel upper surface distance h of intermediate channel1) with reflecting
Phase relation, this figure is λ=2cm's as a result, therefore h1Scope be 0.2cm to 1.2cm, it is further seen that when adjustment ginseng
During number w, phase is had no effect on.Fig. 6 shows the length of side w of intermediate channel and reflected amplitude relation, this figure be λ=2cm's as a result,
Therefore the scope of w is 0.1cm to 0.4cm, it is further seen that as adjustment h1When, have substantially no effect on amplitude.Pass through Fig. 5 and Fig. 6
Demonstrate reflected phase and amplitude can be by adjusting a parameter individually to control.
Fig. 7 shows the schematic diagram of acoustic holography imaging, and plane where the surface of Meta Materials is known as hologram plane, loudspeaker 3
Far field incidence is placed on, incident angle is with hologram plane into 45 degree, and 2 face hologram plane of imaging plane, distance is 11 λ.
Fig. 8 shows the holographic imaging of numerical simulation as a result, imaging design is three capitalizations " N " " J " " U ".
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
- A kind of 1. Meta Materials of the achievable acoustic holography based on phase amplitude modulation, it is characterised in that：Including substrate, the base Plate is equipped with the n × m units for running through substrate, and n represents n rows, and n is positive integer, and m represents m row, and m is positive integer, each unit bag Containing equipped with the first coaxial outer tunnel, intermediate channel and the second outer tunnel, intermediate channel is located at logical outside the first outer tunnel and second Between road, the shape of cross section of first outer tunnel, intermediate channel and the second outer tunnel is square, the first outer tunnel and The length of side of second outer tunnel cross section is λ/5, and the side size range of middle outer tunnel cross section arrives λ/5, the thickness of the substrate for 0 Spend for λ, the altitude range of first outer tunnel is the λ/5 of λ/10 to 3, and λ is the wavelength of incident acoustic wave；In two neighboring unit Heart positional distance is p=λ/4.
- 2. the Meta Materials of the achievable acoustic holography according to claim 1 based on phase amplitude modulation, it is characterised in that： The acoustic impedance of the substrate is at least the acoustic impedance of 100 times of air.
- 3. the Meta Materials of the achievable acoustic holography according to claim 1 based on phase amplitude modulation, it is characterised in that： The direction of propagation of the incident acoustic wave and the angle of substrate surface are 45 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610327720.8A CN105974766B (en) | 2016-05-17 | 2016-05-17 | A kind of Meta Materials of the achievable acoustic holography based on phase amplitude modulation |
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| CN201610327720.8A CN105974766B (en) | 2016-05-17 | 2016-05-17 | A kind of Meta Materials of the achievable acoustic holography based on phase amplitude modulation |
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| CN105974766B true CN105974766B (en) | 2018-05-04 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018039455A1 (en) * | 2016-08-25 | 2018-03-01 | Duke University | Holographic acoustic imaging systems and devices based on a dynamic aperture and methods of use |
| CN106887224B (en) * | 2017-03-10 | 2021-03-19 | 南京大学 | Digital acoustics supernormal material |
| CN109597292B (en) * | 2018-12-10 | 2020-05-29 | 浙江大学 | Reflection type acoustic holographic imaging method and device based on super surface |
| CN109448693B (en) * | 2018-12-25 | 2023-01-03 | 中国地质大学（武汉） | Acoustic super surface capable of simultaneously regulating amplitude and phase |
| CN110779477B (en) * | 2019-09-16 | 2020-10-27 | 南京大学 | Acoustic method for identifying shape of object in real time |
| CN110647024B (en) * | 2019-10-30 | 2020-10-09 | 武汉大学 | Method for realizing circuitous phase coding multiplexing based on super-surface array structure |
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| US3400363A (en) * | 1965-12-09 | 1968-09-03 | Pan American Petroleum Corp | Wavelet reconstruction process for sonic, seismic, and radar exploration |
| US4248093A (en) * | 1979-04-13 | 1981-02-03 | The Boeing Company | Holographic resolution of complex sound fields |
| CN102928844B (en) * | 2012-11-08 | 2015-01-21 | 中北大学 | Underwater sub-wavelength resolution ratio three-dimensional imaging method |
| CN103913787A (en) * | 2014-04-18 | 2014-07-09 | 南京大学 | Lens structure body of acoustical super lens, acoustical super lens and imaging device thereof |
| US10321211B2 (en) * | 2014-10-10 | 2019-06-11 | David Curtinsmith | Method and apparatus for providing customised sound distributions |
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