Sound wave phase modulation and sound field reconstruction method based on near-field orbital angular momentum conversion

A technology of orbital angular momentum and phase modulation, applied in the measurement of ultrasonic/sonic/infrasonic, ultrasonic/sonic/infrasonic transmission systems, measuring devices, etc., can solve the problem of consuming huge computing resources, unclear working mechanism and principle, and inability to adjust independently and other issues to achieve the effect of increasing pixel density, increasing information storage capacity, and reducing geometric size

Active Publication Date: 2022-05-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The above scheme shows the following three defects in the actual implementation process: first, once the geometric parameters of the artificial acoustic structure are determined, its acoustic response characteristics cannot be changed, and it is difficult to apply to the scene of dynamically programmable sound field reconstruction; second, based on In the control of sound field scattering characteristics in the design of artificial acoustic structures, the phase

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  • Sound wave phase modulation and sound field reconstruction method based on near-field orbital angular momentum conversion
  • Sound wave phase modulation and sound field reconstruction method based on near-field orbital angular momentum conversion
  • Sound wave phase modulation and sound field reconstruction method based on near-field orbital angular momentum conversion

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[0083] Example 1

[0084] like figure 1 As shown, a method of acoustic phase modulation and acoustic field reconstruction based on near-field orbital angular momentum conversion disclosed in this embodiment uses the evanescent acoustic vortex and acoustic vortex metasurface generated by the speaker array in the rigid cylindrical waveguide The near-field coupling interaction realizes the conversion of orbital angular momentum, and the modulation of the transmission phase of the transmitted acoustic wave is obtained through the rotating speaker array or the acoustic vortex metasurface. Using the point source algorithm, the complex amplitude distribution of the hologram of the target acoustic image is obtained, and the driving voltage amplitude of the speaker array at different pixel points and the rotation angle of the speaker array / acoustic vortex metasurface are correspondingly adjusted to reconstruct the target acoustic image.

[0085] like figure 2 As shown, this embodime...

Example Embodiment

[0110] Example 2

[0111] The acoustic hologram is designed, and the reconstruction of different target acoustic images is realized by switching the sign of the topological charge of the evanescent acoustic vortex.

[0112] like figure 2 As shown, this embodiment includes the following steps:

[0113] Step 1: Place the loudspeaker array into a rigid cylindrical waveguide to generate high-quality evanescent acoustic vortices.

[0114] Use 4 micro-speakers with a diameter of 10mm, arrange them in a 2×2 square grid array and fix them on a sound-absorbing sponge with a diameter of 40mm, set the distance between the speakers at 15mm, and use a function signal generator to generate 4-way amplitude The same but independent sinusoidal voltage signals drive the microspeaker array synchronously. The frequency of the sinusoidal voltage signal is 2858Hz, and along the counterclockwise direction, the driving electrical signals corresponding to the four microspeakers have 0°, 90°, and 18...

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Abstract

The invention discloses a sound wave phase modulation and sound field reconstruction method based on near-field orbital angular momentum conversion, and belongs to the field of acoustic signal processing and sound field regulation and control. The evanescent acoustic vortex generated by the loudspeaker array in the rigid cylindrical waveguide tube and the near-field coupling interaction of the acoustic vortex metasurface are utilized to realize orbital angular momentum conversion, and continuous modulation of transmission sound wave transmission phase is obtained by rotating the loudspeaker array or the acoustic vortex metasurface. And then hologram complex amplitude distribution of the target acoustic image is obtained by using a point source algorithm, driving voltage amplitudes of the loudspeaker array at different pixel points and a rotation angle of the loudspeaker array or the acoustic vortex metasurface are correspondingly adjusted, and the target acoustic image is reconstructed. The limitation of the cut-off frequency of the waveguide tube on the minimum inner diameter of the pipeline can be broken through, the transverse size of the pixel point of the acoustic geometric phase sound field reconstruction functional device is reduced to the sub-wavelength size, the information storage density of the device is improved, and the adverse effect of high-order diffraction is effectively inhibited.

Description

technical field [0001] The invention relates to sound wave transmission phase modulation and free space sound field reconstruction, and belongs to the field of acoustic signal processing and sound field control. Background technique [0002] Acoustic field reconstruction and complex three-dimensional acoustic field regulation have a wide range of applications in the fields of particle manipulation, ultrasound imaging, medical diagnosis and virtual reality. At present, there are mainly two mature technical means to obtain complex three-dimensional sound fields in the laboratory and commercially: one is to use the integrated speaker array, and realize the amplitude and the driving voltage of the speaker at different pixel positions through electronic circuit design and computer programming. The point-by-point control of the phase, and then adjust the amplitude and phase of the sound field radiated by the speaker, and reconstruct the target sound field, which belongs to the act...

Claims

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Application Information

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IPC IPC(8): G01H17/00G03H3/00H04B11/00G06T11/00
CPCG01H17/00G03H3/00H04B11/00G06T11/00
Inventor 刘冰意黄玲玲魏群烁苏照贤王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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