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A method and system for implementing acoustic tweezers based on spatial Fourier transform

A technology of Fourier transform and implementation method, which is applied in the field of acoustic tweezers based on spatial Fourier transform, can solve the problem of not being able to independently manipulate multiple target objects, and achieve improved flexibility, good effect, and low implementation cost Effect

Active Publication Date: 2021-09-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the problem that in the single-frequency standing wave acoustic tweezers existing in the prior art, an acoustic radiation potential well distribution that can be defined arbitrarily cannot be formed in space, so that multiple target objects cannot be independently manipulated, the present invention provides a spatial Fourier-based Acoustic tweezers implementation method and system for leaf transformation, based on circuit equipment with fewer channels and simple acoustic devices to achieve arbitrary distribution of spatial potential wells, which can be used for independent manipulation of multi-target objects

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  • A method and system for implementing acoustic tweezers based on spatial Fourier transform
  • A method and system for implementing acoustic tweezers based on spatial Fourier transform
  • A method and system for implementing acoustic tweezers based on spatial Fourier transform

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Embodiment 1

[0060] An acoustic tweezers system based on spatial Fourier transform such as figure 2 As shown, it includes a transducer, an ultrasonic propagation medium and a drive module; the transducer is an ultrasonic transducer, and the two ultrasonic transducers in the system are placed opposite and parallel, and are divided into ultrasonic transducer L and ultrasonic transducer R, the working bandwidth of the two ultrasonic transducers is located at f 1 and f 2 Among them, it is required that within the working bandwidth, the sensitivity of the ultrasonic transducer is not lower than 25% of the highest sensitivity. The ultrasonic propagation medium is arranged between the two ultrasonic transducers, and the ultrasonic propagation medium is fluid, which can be any gas or liquid, such as air or water.

[0061] Ultrasonic transducers can be of different types, including but not limited to piezoelectric ceramic transducers, piezoelectric composite transducers, magnetostrictive transdu...

Embodiment 2

[0102] The content of this embodiment is basically the same as that of Embodiment 1, the difference is that this embodiment implements two independent acoustic potential wells at any designated position, so as to achieve the purpose of capturing the target object at any designated position.

[0103] A pair of parallel broadband interdigital transducers prepared on a Y-X 128° substrate with a thickness of 0.5 mm was selected as the acoustic wave excitation device, and a microfluidic fluid was prepared on the substrate with polydimethylsiloxane (PDMS) as the material. The cavity is filled with water as the fluid medium, and mixed with polystyrene plastic particles with a radius of 5 microns as the object to be manipulated.

[0104] The width of the prepared microfluidic chamber is 2mm, so take l=1mm=1000μm, and the proposed capture position x 1 = 0 μm and x 2 = Polystyrene microparticles around 600 μm so that they form a band respectively.

[0105] In this embodiment, two pote...

Embodiment 3

[0111] The content of this embodiment is basically the same as that of Embodiment 1, the difference is that this embodiment implements three independent acoustic potential wells at any designated position, so as to achieve the purpose of capturing the target object at any designated position.

[0112]In this embodiment, a pair of parallel broadband interdigital transducers prepared on a Y-X 128° substrate with a thickness of 0.5 mm is selected as the acoustic wave excitation device, and polydimethylsiloxane (PDMS) is used as the material on the substrate to prepare A microfluidic chamber is filled with water as the fluid medium, and polystyrene plastic particles with a radius of 5 microns are mixed as objects to be manipulated.

[0113] The width of the prepared microfluidic chamber is 2mm, so take l=1mm=1000μm, and the proposed capture position x 1 = -180μm, x 2 = 0 μm, x 3 = Polystyrene particles around 180μm, so that they form a strip respectively, and move x 2 = 0, whil...

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Abstract

The invention discloses an acoustic tweezers realization method and system based on spatial Fourier transform, and belongs to the technical field of acoustic manipulation. Aiming at the problem that in the single-frequency standing wave acoustic tweezers existing in the prior art, an acoustic radiation potential well distribution that can be defined arbitrarily cannot be formed in space, so that multiple target objects cannot be independently manipulated, the present invention provides a spatial Fourier-based The acoustic tweezers implementation method and system of leaf transformation, using the orthogonality of trigonometric functions, decomposes the acoustic radiation potential distribution expected to be formed in the space domain into the superposition of the acoustic radiation potential on multiple frequency components, and the amplitude of the obtained components The sum and phase determine the electrical signals used to drive the two transducers; the frequency components of the acoustic radiation potential are adjusted based on the control requirements to realize the dynamic adjustment of multiple independent acoustic radiation potential wells. It overcomes the deficiency that the existing single-frequency standing wave acoustic tweezers cannot independently control multiple target objects, and greatly improves the flexibility of the acoustic tweezers.

Description

technical field [0001] The present invention relates to the technical field of acoustic manipulation, and more specifically, to a method and system for implementing acoustic tweezers based on spatial Fourier transform. Background technique [0002] Acoustic tweezers technology is a new type of non-contact control technology. Its main principle is to use the physical effects of acoustic radiation force and acoustic flow on the object in the sound field to capture, move and rotate the target object in real time. Acoustic tweezers working at ultrasonic frequencies (that is, above 20 kilohertz) can control objects in space with accuracy up to microns or even smaller, so they have important application prospects in the fields of material preparation, biological analysis, and medical testing. At present, the technical paths relied on by acoustic tweezers are mainly divided into two categories: single beam method and standing wave field method. [0003] Beam acoustic tweezers tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/10B01L3/00
CPCB01J19/10B01L3/50273B01L3/502761
Inventor 郭霞生许光耀章东
Owner NANJING UNIV
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