Full-coverage surface acoustic wave interdigital transducer

Abstract

The present application relates to the technical field of transducer, especially to full-coverage surface acoustic wave interdigital transducer, comprising two full-coverage transducers and a microfluidic channel, when the two transducers are started simultaneously, under the control of the same frequency signal, an enhanced standing wave acoustic field is formed in the microfluidic channel for controlling the biomicroparticles in the channel; when one of the transducers is started, the transducer forms an enhanced traveling wave acoustic field in the microfluidic channel for controlling the biomicroparticles (biomicroparticles and bionanoparticles). Without changing the original processing technology, materials and control system, by optimizing the structure design of the interdigital transducer, the present application greatly improves the intensity and controllability of the acoustic field in the channel when the interdigital transducer and the microfluidic channel are at a certain angle, and achieves enhanced acoustic field coverage and most effective acoustic field control in different shaped microfluidic channels. Under the same input power condition, the present application can greatly improve the control efficiency of the patterning arrangement, separation and purification of biomicroparticles.

Description

Technical Field

[0001] This invention relates to the field of transducer technology, and more particularly to a full-coverage surface acoustic wave interdigital transducer. Background Technology

[0002] Currently, surface wave interdigital transducers, when used in conjunction with microfluidics for bioparticle manipulation, suffer from high power consumption and low flux. It suffers from drawbacks such as low efficiency. Especially when a traditional equal-length interdigitated transducer is at a certain angle to the fluid direction, the transducer and the sample containing the fluid... There is a large area of ​​transducer-free coverage between the fluids in this device, and existing devices do not fully utilize the transducer material. Effective design directly leads to surface acoustic wave energy loss and reduced sample manipulation capability. Therefore, we propose a full-coverage acoustic... Surface wave interdigitated transducer. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a full-coverage surface acoustic wave interdigital transducer, which has the characteristics of generating a louder sound radiation force on biological particles, greatly improving the control efficiency of patterned arrangement, separation and purification of biological particles, and solving the problem of low control capability of existing surface acoustic wave interdigital transducers when used in conjunction with microchannels for biological particle control.

[0004] The present invention provides the following technical solution: a full-coverage surface acoustic wave interdigital transducer, comprising two full-coverage transducers and a microchannel. When the two transducers are started simultaneously, an enhanced standing wave sound field is formed in the microchannel under the control of a signal of the same frequency, controlling the biological particles in the channel; when one of the transducers is started, the transducer forms a traveling wave sound field in the microchannel, controlling the biological particles in the channel.

[0005] Preferably, when the microchannel is a straight channel, the transducer has an asymmetrical structure, with two transducers centrally symmetrically distributed on both sides of the straight channel, and the two asymmetrical transducers form an enhanced sound field within the straight channel.

[0006] Preferably, when the microchannel is an annular channel, the transducer is an annular structure, with one transducer located inside the annular channel and the other transducer located outside the annular channel, and the two annular transducers forming an enhanced sound field within the annular channel.

[0007] Preferably, when the microchannel is a circular channel, the transducer is a crescent-shaped structure, with two crescent-shaped transducers symmetrically arranged on both sides of the circular channel. The two crescent-shaped transducers form an enhanced sound field within the circular channel, thereby driving the liquid sample within the channel to perform effective mixing and movement.

[0008] Preferably, when the microchannel is a curved channel, the transducers are curved transducers with the same curvature, the two transducers are located on both sides of the curved channel, and the two curved transducers form an enhanced sound field within the curved channel.

[0009] Preferably, the particle size of the bioparticles ranges from nanometers to micrometers (10). -9 m~10 -6 m).

[0010] This invention provides a full-coverage surface acoustic wave interdigital transducer. Without changing the original processing technology, materials, and control system, by optimizing the interdigital transducer structural design, it greatly improves the intensity and controllability of the sound field within the channel when the surface acoustic wave interdigital transducer and the microchannel are at a certain angle. Furthermore, it achieves maximum sound field coverage and the most effective sound field control in microchannels of different shapes. Under the same input power conditions, the device made using the principle of this invention can generate greater acoustic radiation force on biological particles, greatly improving the efficiency of manipulating the patterned arrangement, separation, and purification of biological particles. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention.

[0012] In the diagram: 1. Microchannel; 2. Transducer Detailed Implementation The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0013] Please see Figure 1-4This invention provides a technical solution: a fully covered surface acoustic wave interdigitated transducer, comprising a microchannel 1 and two fully covered transducers 2. When both transducers 2 are activated simultaneously, under the control of a signal of the same frequency, an enhanced standing wave acoustic field is formed within the microchannel 1, controlling the bioparticles (biomicroparticles and bionanoparticles) within the channel. When one of the transducers 2 is activated, the transducer 2 forms an enhanced traveling wave acoustic field within the microchannel 1, controlling the bioparticles within the channel. The particle size range of the bioparticles is from nanometer to micrometer (10⁻⁶). -9 m~10 -6 m).

[0014] Example 1: Full-coverage surface acoustic wave interdigital transducer (standing wave and traveling wave) when microchannel 1 is a straight channel.

[0015] like Figure 1 As shown, a pair of centrally symmetrical surface acoustic wave interdigital transducers are distributed on both sides of the microchannel 1. The transducer 2 is designed as an asymmetrical structure, by extending the right interdigital finger of the surface acoustic wave interdigital transducer, i.e., as shown in the figure. Figure 1 The diagram shows an interdigitated transducer extending towards the microchannel from one side where there is a blank area. This allows the blank area within the angle between the right side of the conventional equal-length interdigitated transducer and the microchannel 1 to be filled with transducers 2. This efficiently utilizes the transducers 2 and the piezoelectric material to create a surface acoustic wave (SAW) sound field that maximizes channel coverage. This structure allows SAW to propagate into the microchannel 1 within the effective range of the entire SAW interdigitated transducer, thereby achieving efficient manipulation of biological particles within the channel. When both transducers 2 are controlled by the same frequency signal, they can form an enhanced standing wave sound field throughout the microchannel 1, achieving efficient manipulation of biological particles. When only one transducer 2 is activated, an enhanced SAW traveling wave is formed throughout the entire linear channel area, controlling the biological particles within the channel.

[0016] Example 2: Full-coverage surface acoustic wave interdigital transducer (standing wave and traveling wave) when microchannel 1 is an annular channel.

[0017] like Figure 2 As shown, a full-coverage annular surface acoustic wave interdigitated transducer is provided. Two transducers 2 are arranged around the microchannel 1, one inside the annular microchannel 1 and the other outside the annular microchannel 1, thereby forming an enhanced surface acoustic wave standing wave in the entire annular channel area. When only one of the transducers 2 is turned on, an enhanced surface acoustic wave traveling wave is formed in the entire annular channel area, controlling the biological particles in the channel.

[0018] Example 3: Full-coverage surface acoustic wave interdigital transducer (standing wave and traveling wave) when microchannel 1 is a circular channel.

[0019] like Figure 3 As shown, a pair of crescent-shaped interdigital transducers of surface acoustic waves achieve full coverage of the sound field within the microchannel 1, forming a standing wave field within the circular microchannel 1, thereby effectively driving the liquid sample within the channel to mix and move effectively; when only one transducer 2 is turned on, an enhanced traveling surface acoustic wave is formed in the entire annular channel area, controlling the biological particles within the channel.

[0020] Example 4: Full-coverage surface acoustic wave interdigital transducer (standing wave and traveling wave) when microchannel 1 is a curved channel.

[0021] like Figure 4 As shown, surface acoustic wave interdigitated transducers with the same curvature are set on both sides of the curved microchannel 1. A standing wave field can be formed in the curved microchannel 1, thereby effectively utilizing the fluid characteristics of the sample in the curved channel and cooperating with the sound field for effective manipulation. When one of the transducers 2 is turned on, an enhanced surface acoustic wave traveling wave is formed in the entire annular channel area to control the biological particles in the channel.

[0022] In this invention, 1. A structural improvement was made to the traditional surface acoustic wave interdigital transducer. By filling the blank area with additional interdigital transducers, the sound field in the control region was enhanced. Under the same electrical signal control, a stronger sound field than that of the traditional transducer can be formed in all regions where surface acoustic waves are generated corresponding to the aperture of transducer 2.

[0023] 2. By combining a fully covered surface acoustic wave interdigital transducer with microchannel 1, a sound pressure field is formed inside the channel. Under these conditions, the biological particles in the flow field are more strongly affected by acoustic radiation force, resulting in higher manipulation efficiency.

[0024] 3. When the microchannel 1 is a linear channel, the surface acoustic wave interdigital transducer forms a standing wave sound field that is parallel to the direction of transducer 2 when a group of surface acoustic wave interdigital transducers are distributed in opposite directions. Moreover, the sound pressure at the nodes is stronger than the surrounding potential field, which allows biological particles to be precisely manipulated under low input power conditions.

[0025] 4. Under the same control effect, the full-coverage surface acoustic wave interdigital transducer can effectively utilize space, save on the consumption of piezoelectric material substrate, reduce device energy consumption and thermal effects, and reduce potential damage to biological samples. With the input signal power unchanged, it can improve the control efficiency of surface acoustic waves on biological particles in the microchannel 1 compared with the conventional transducer 2 of the same size.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fully covered surface acoustic wave interdigital transducer, characterized in that: It includes two full-coverage transducers and a microchannel. When both transducers are activated simultaneously, under the control of a signal of the same frequency, an enhanced standing wave sound field is formed in the microchannel to control the biological particles in the channel. When one of the transducers is activated, the transducer forms an enhanced traveling wave sound field in the microchannel to control the biological particles in the channel. The microchannel is a straight channel, and the transducers are asymmetrical structures. The two transducers are centrally symmetrically distributed on both sides of the straight channel. The side of the transducer with a blank area with the microchannel interdigitates and extends towards the microchannel, so that the two asymmetrical transducers form a full-coverage sound field in the straight channel.

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