CN112536208B - Multi-channel phase difference controlled elastic wave spin source excitation device and preparation method - Google Patents
Multi-channel phase difference controlled elastic wave spin source excitation device and preparation method Download PDFInfo
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- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
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- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
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Abstract
The invention relates to an elastic wave spin source excitation device controlled by multichannel phase difference, which comprises a multichannel signal generator, a piezoelectric vibration component array, a connecting fixing piece and a mounting seat, wherein the piezoelectric vibration component array comprises a plurality of piezoelectric vibration components arranged according to a set array, the multichannel signal generator comprises a plurality of signal output channels, the plurality of signal output channels are respectively connected to each piezoelectric vibration component in the piezoelectric vibration component array, the piezoelectric vibration components correspond to the signal output channels one by one, the piezoelectric vibration components are connected with the mounting seat through the connecting fixing piece, and the mounting seat is used for mounting an elastic wave spin source.
Description
Technical Field
The invention relates to the field of functional devices and elastic wave source generating devices, in particular to an elastic wave spin source excitation device controlled by a multichannel phase difference and a preparation method thereof.
Background
Spin is one of the most important physical properties in quantum mechanics, and is the basis of topological states. A number of studies have shown that shear waves can naturally have non-trivial spins and spin-dependent properties, and recent studies have revealed spin characteristics of longitudinal waves and longitudinal-shear mixed elastic waves. In the visual sense, elastic wave spins can manifest as directionally selective related propagation. However, due to the complexity of the elastic wave and the lack of an elastic wave spin source excitation device, the spin of the elastic wave currently lacks a corresponding experimental basis. The elastic wave spin source can provide a specific way for experiments, so that the spin nature of the elastic wave can be verified.
On the other hand, the topology and the physics are quickly combined, important influences are generated in the fields of quantum field theory, condensed state physics and the like, and then the mechanical system based on periodic structures (such as phonon crystals, metamaterials and the like) is quickly expanded, so that the 'topological mechanics' is initiated. Due to the flexible and controllable characteristics of unit size, geometric parameters, material properties and the like, the periodic structure and the classical wave system in the periodic structure become good platforms for detecting or realizing a plurality of topological physical phenomena. Researchers have conducted studies on analog hall effect, spin hall effect, valley hall effect, and the like in acoustic or mechanical systems. Based on the consideration of energy consumption, easy use and the like, the structure and the device of passive regulation (analogy to spin Hall effect and valley Hall effect) are more beneficial in application. One of the salient features of these topologies is the unidirectional transmission of elastic waves, but the propagation direction of their topological boundary states is spin-dependent, and elastic wave spin sources with a specific polarization direction can selectively excite the unidirectional boundary states. However, the experimental basis is very rare, especially for the widely used plate wave (Lamb wave) and Rayleigh wave (Rayleigh wave).
Therefore, it is highly desirable to provide an elastic wave spin source excitation device to provide a key basis for experimental study of the topology.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multichannel phase difference controlled elastic wave spin source excitation device and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a multichannel phase difference controlled elastic wave spin source excitation device comprises a multichannel signal generator, a piezoelectric vibration component array, a connecting fixing piece and a mounting seat, wherein the piezoelectric vibration component array comprises a plurality of piezoelectric vibration components arranged according to a set array;
the multi-channel signal generator is characterized in that a plurality of signal output channels of the multi-channel signal generator respectively output a plurality of electric signals with different phases, each piezoelectric vibration component in the piezoelectric vibration component array respectively receives the electric signal of each channel, converts the electric signal into mechanical vibration and transmits the mechanical vibration to the elastic wave spin source on the mounting seat, and excitation of the elastic wave spin source is completed.
Furthermore, the connecting and fixing piece is made of epoxy resin materials, and the mounting seat is a metal plate or a metal block.
Further, the arrangement mode of the piezoelectric vibration component array is obtained according to the required frequency band of the elastic wave spin source.
Preferably, the piezoelectric vibration component comprises a piezoelectric sheet and a metal column, the piezoelectric sheet is an annular piezoelectric sheet, the piezoelectric sheet is sleeved on the metal column, a through hole is formed in the mounting seat, the metal column is sleeved in the through hole of the mounting seat, a connecting fixing piece is filled between the metal column and the mounting seat, the upper surface and the lower surface of the piezoelectric sheet are respectively connected with a positive polarization surface and a negative polarization surface, and the wiring anode and the wiring cathode of the multi-channel signal generator are respectively connected with the positive polarization surface and the negative polarization surface of the piezoelectric sheet.
The piezoelectric pieces are arranged in two pieces and are respectively sleeved at the upper end and the lower end of the metal column, the mounting seat is arranged in the middle of the metal column, the piezoelectric pieces at the upper end and the lower end of the metal column are symmetrically arranged, and the polarities of the opposite polarization surfaces of the two piezoelectric pieces are the same.
And a connecting fixing piece is filled between the piezoelectric sheet and the metal column.
The preparation method of the elastic wave spin source excitation device controlled by the multichannel phase difference comprises the following steps:
s11: acquiring the size, the position and the arrangement mode of the piezoelectric patches according to the required frequency band of the elastic wave spin source;
s12: acquiring the size, the position and the arrangement mode of the metal columns according to the principle corresponding to the size, the position and the arrangement mode of the piezoelectric sheets;
s13: according to the principle corresponding to the size, position and arrangement mode of the metal columns, the size, position and arrangement mode of the four through holes on the mounting seat are obtained;
s14: preparing the piezoelectric sheet, the metal posts and the mounting seat according to the size, the position and the arrangement determined in the steps S11-S12;
s15: mounting the metal column in the through hole of the mounting seat through the connecting and fixing piece;
s16: two piezoelectric sheets are respectively arranged at the two ends of each metal column at the same distance from the mounting seat and are fixed by connecting and fixing pieces to form a group of piezoelectric vibration components;
s17: according to the principle that the polarities of the opposite polarization surface connecting wires of the two piezoelectric plates are the same, leading out leads from the upper and lower polarization surface connecting wires of each piezoelectric plate respectively, and sequentially connecting each group of piezoelectric vibration components into a signal output channel of the multi-channel signal generator;
s18: and adjusting the phase difference of each channel of the multi-channel signal generator to generate a spin source.
Preferably, the piezoelectric vibration component comprises a piezoelectric sheet, and the piezoelectric sheet is fixedly arranged on the surface of the mounting seat through a connecting fixing piece.
The piezoelectric sheet is a circular piezoelectric sheet, the shape and the size of the connecting and fixing piece are matched with those of the piezoelectric sheet, and the connecting and fixing piece is filled between the piezoelectric sheet and the mounting seat.
The preparation method of the elastic wave spin source excitation device controlled by the multichannel phase difference comprises the following steps:
s21: acquiring the size, the position and the arrangement mode of the piezoelectric patches according to the required frequency band of the elastic wave spin source;
s22: mounting the piezoelectric sheets on the mounting seat through connecting and fixing pieces according to the size, the position and the arrangement mode determined in the steps S11-S12;
s23: leading out wires from the upper and lower polarization plane wiring of each piezoelectric plate respectively, and sequentially connecting each group of piezoelectric vibration components into a signal output channel of a multi-channel signal generator;
s24: and adjusting the phase difference of each channel of the multi-channel signal generator to generate a spin source.
Compared with the prior art, the invention has the following advantages:
1) the multi-channel signal generator is connected with the multi-channel signal generator through the piezoelectric vibration components, the multi-channel signal generator inputs signals with phase differences to each piezoelectric vibration component, each piezoelectric vibration component converts an electric signal into mechanical vibration and conducts the mechanical vibration to the mounting seat, and the mounting seat is provided with a structure needing an elastic wave spin source, so that elastic waves with spin characteristics are excited, the multi-channel signal generator can be used for related experiments and practical application of elastic wave spin, the blank that no elastic wave spin source excitation device exists in the market at present and no elastic wave spin source is used in experimental research is made up, and data basis is provided for related experimental research;
2) the invention designs the excitation devices with two structures, can be packaged according to different use scenes and requirements, and becomes a detachable and portable device, and the materials adopted by the invention can be obtained by customization purchase, and the excitation device has a simple structure and is convenient to prepare.
Drawings
FIG. 1 is a schematic view with parts broken away of example 1;
FIG. 2 is a cross-sectional view of a single piezoelectric sheet according to embodiment 1;
FIG. 3 is a schematic diagram of external signal access of a piezoelectric patch;
FIG. 4 is a schematic diagram of a four-channel phase-delayed signal;
FIG. 5 is a schematic view of the entire structure of embodiment 1;
FIG. 6 is a graph showing the effect of numerical simulation in example 1;
FIG. 7 is a graph showing the results of the Rayleigh wave experiment using the apparatus of example 1;
FIG. 8 is a schematic view of example 2 with parts broken away;
FIG. 9 is a cross-sectional view of the center of a single piezoelectric plate and a wiring diagram of the single piezoelectric plate according to embodiment 2;
FIG. 10 is a schematic view of the entire structure of embodiment 2;
FIG. 11 is a graph showing the effect of numerical simulation in example 2.
The device comprises a piezoelectric sheet 1, a piezoelectric sheet 2, a metal short column 3, a connecting fixing piece 4, a mounting seat 5, a wiring anode 6 and a wiring cathode.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The invention provides a multichannel phase difference controlled elastic wave spinning source excitation device which comprises a multichannel signal generator, a piezoelectric vibration component array, a connecting fixing piece 3 and a mounting seat 4, wherein the piezoelectric vibration component array comprises a plurality of piezoelectric vibration components arranged according to a set array, the multichannel signal generator comprises a plurality of signal output channels, the plurality of signal output channels are respectively connected to each piezoelectric vibration component in the piezoelectric vibration component array, the piezoelectric vibration components correspond to the signal output channels one by one, the piezoelectric vibration components are mutually connected with the mounting seat 4 through the connecting fixing piece 3, the mounting seat 4 is used for mounting an elastic wave spinning source, and the arrangement mode of the piezoelectric vibration component array is obtained according to the required frequency band of the elastic wave spinning source.
A plurality of signal output channels of the multi-channel signal generator respectively output a plurality of electric signals with different phases, each piezoelectric vibration component in the piezoelectric vibration component array respectively receives the electric signal of each channel, converts the electric signal into mechanical vibration and transmits the mechanical vibration to the elastic wave spin source on the mounting seat 4, and excitation of the elastic wave spin source is completed. A plurality of signal output channels are connected in a mode, a series of voltage signals are obtained through multi-channel adjustment according to actual requirements, and the number of the channels and delay phases are adjustable and controllable.
Example 1
As shown in fig. 1 and 2, in this embodiment, the piezoelectric vibration component includes a piezoelectric sheet 1 and a metal pillar 2, the piezoelectric vibration component array includes a piezoelectric sheet array and a metal pillar array, the piezoelectric sheet array is an array with set parameters designed according to actual use requirements, the set parameters include the size and shape of a single piezoelectric sheet 1, the number of the piezoelectric sheets 1 installed, the distance and position between the piezoelectric sheet arrays, and the like, and the metal pillar array is an array with set parameters designed according to the parameters of the piezoelectric sheet array.
The piezoelectric patches 1 are annular piezoelectric patches or other piezoelectric materials with similar shapes, and two piezoelectric patches are arranged and respectively sleeved at the upper end and the lower end of the metal column 2, through holes are formed in the mounting seat 4, the metal column 2 is sleeved in the through holes of the mounting seat 4, the mounting seat 4 is arranged at the center of the metal column 2, the middle surfaces of the metal column and the metal column are mutually overlapped, fixing parts 3 are respectively filled and connected between the metal column 2 and the mounting seat 4 as well as between the piezoelectric patches 1 and the metal column 2, the upper surface and the lower surface of the piezoelectric patches 1 are respectively provided with a positive polarization surface wiring and a negative polarization surface wiring, a wiring positive electrode 5 and a wiring negative electrode 6 of the multichannel signal generator are respectively connected into the positive polarization surface wiring and the negative polarization surface wiring of the piezoelectric patches 1, the piezoelectric patches 1 at the upper end and the lower end of the metal column 2 are mutually symmetrically arranged, the polarities of the opposite polarization surface wirings of the two piezoelectric patches 1 are the same, in this embodiment, the opposite polarization surface wirings of the two piezoelectric patches 1 are negative electrodes, the opposite plane of polarization is wired to be positive.
The annular piezoelectric sheet 1 is used for converting an electric signal into mechanical vibration, and the metal column 2 is used for transmitting the mechanical vibration to an elastic wave spin source structure arranged on the mounting seat 4 so as to generate an elastic wave spin source with a main displacement direction parallel to a middle plane of the structure. The connecting and fixing member 3 is made of a non-conductive material such as an epoxy resin material which has high strength and is easy to mount, and is used for connecting and fixing the annular piezoelectric sheet 1 and the metal column 2, or connecting and fixing the metal column 2 and the mounting seat 4, and the mounting seat 4 is a metal plate or a metal block or other packaging materials.
As shown in fig. 3, in a manner that the annular piezoelectric sheet 1 is connected to a voltage signal source, in this embodiment, a four-channel signal generator is adopted, four sets of piezoelectric vibration components are provided, the piezoelectric sheets 1 are arranged according to the array shown in fig. 3, the upper piezoelectric sheet 1 shown in fig. 2 is taken, and four sets of piezoelectric sheets 1 are used to form an array. The positive wiring pole 5 and the negative wiring pole 6 are respectively connected into the positive polarization plane wiring and the negative polarization plane wiring of the piezoelectric plate 1. Vi＝V0 cos(ωt+φi) For external access to a source of voltage signals, wherein
Is the phase of each channel. As shown in fig. 3, the four channels of piezoelectric sheets are connected to have a phase delay or a phase advance in the order of 1 → 2 → 3 → 4.
Fig. 4 is a schematic diagram of a four-channel broadband pulse voltage signal with a center frequency of 20 khz from the voltage signal source of fig. 3, wherein the phases of the 20 khz signals are sequentially delayed by pi/2 from channel 1 to channel 4.
Fig. 5 is a schematic view of an overall structure of a four-group piezoelectric patch structure array in this embodiment, and the preparation method includes the following steps:
(1) designing the size of the piezoelectric sheet 1 according to a given frequency band, and designing the positions and arrangement modes of four groups of piezoelectric sheet arrays;
(2) designing the size, the position and the arrangement mode of four metal columns 2 according to the size of the piezoelectric sheet 1 to correspond to the piezoelectric sheet array;
(3) according to the size of the metal column 2, the sizes, the positions and the arrangement modes of the four through holes on the mounting seat 4 are designed to correspond to the metal column 2;
(4) according to the position and the size of the through hole on the mounting seat 4, the through hole is formed on the mounting seat 4;
(5) fixing the metal column 2 in the through hole of the mounting seat 4 by using an epoxy resin connecting and fixing piece 3, wherein the mounting details are shown in FIG. 2;
(6) two piezoelectric sheets 1 are respectively arranged at the two ends of each metal column 2 at the same distance from the mounting seat 4 and are fixed by epoxy resin connecting and fixing pieces 3 to form a group of piezoelectric vibration components, the mounting details of the piezoelectric vibration components are shown in figure 2, and four groups of electric vibration components are arranged;
(7) the lead wires are respectively led out from each piezoelectric patch 1, the piezoelectric patches 1 at two ends of each metal column 2 are in a group, the connection wires are defined to be positive at one side far away from the mounting seat 4 and negative (or opposite) at one side close to the mounting seat 4, the piezoelectric patches 1 of each group are sequentially connected with signal sources according to different phase differences, and the installation details are shown in fig. 2.
Fig. 6 is an effect diagram of the apparatus in this embodiment, which shows the calculation result and the effect of the in-plane displacement field of an example, and the specific parameters of this embodiment are as follows: the outer diameter of the annular piezoelectric sheet 1 is 10mm, the inner diameter is 5mm, and the thickness is 1 mm; the diameter of the metal column 2 is 4.5mm, and the height is 18 mm; the thickness of the mounting seat 4 is 8 mm; the connecting fixture 3 is an epoxy layer with a thickness of 0.25 mm.
As shown in fig. 7, the experimental result of the elastic wave spin source device of the present embodiment on rayleigh waves shows the directionally selective propagation characteristic under the spin elastic wave excitation condition, and it is obvious that the spin elastic wave propagates mainly leftward (negative x-axis direction).
Example 2
As shown in fig. 8 and 9, in the present embodiment, the piezoelectric vibration component includes a piezoelectric sheet 1, the piezoelectric vibration component array includes a piezoelectric sheet array, the piezoelectric sheet array is an array designed according to actual use requirements and has set parameters, and the set parameters include the size and shape of a single piezoelectric sheet 1, the number of installed groups of piezoelectric sheets 1, the distance and position between the piezoelectric sheet arrays, and the like.
The piezoelectric patch 1 is fixedly arranged on the surface of the mounting seat 4 through the connecting fixing piece 3, the piezoelectric patch 1 is a circular piezoelectric patch or other piezoelectric materials with similar shapes, the shape and the size of the connecting fixing piece 3 are matched with the piezoelectric patch 1, the piezoelectric patch 1 is directly filled between the piezoelectric patch 1 and the mounting seat 4, the circular piezoelectric patch 1 is used for converting an electric signal into mechanical vibration and directly transmitting the mechanical vibration to an elastic wave spin source structure mounted on the mounting seat 4 so as to generate an elastic wave spin source with the main displacement direction parallel to the middle plane of the structure, and the rest is the same as that of the embodiment 1.
As shown in fig. 10, which is a schematic view of an overall structure of a four-group piezoelectric patch structure array in this embodiment, the preparation method includes the following steps:
(1) designing the size of the piezoelectric sheet 1 according to a given frequency band, and designing the positions and arrangement modes of four groups of piezoelectric sheet arrays;
(2) the designed array position and arrangement mode of the piezoelectric sheets 1 are packaged and fixed or directly installed on the installation seat 4 and fixed by the epoxy resin connecting and fixing piece 3;
(3) the lead wires are respectively led out from each piezoelectric plate 1, the side of each wiring, which is far away from the mounting seat 4, is defined as positive, the side of each wiring, which is close to the metal plate, is defined as negative (or opposite), and each group of piezoelectric plates 1 are sequentially connected into signal channels with different phase differences.
Fig. 11 is an effect diagram of the apparatus of this embodiment, which shows the calculation result and the spin effect of the out-of-plane displacement field of an example, where the specific parameters of the example are: the diameter of the circular piezoelectric sheet 1 is 10mm, and the thickness of the circular piezoelectric sheet is 1 mm; the thickness of the mounting seat is 2 mm; the connecting fixture 3 is an epoxy layer having a thickness of 0.14 mm.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The elastic wave spin source excitation device is characterized by comprising a multi-channel signal generator, a piezoelectric vibration component array, a connecting fixing piece (3) and a mounting seat (4), wherein the piezoelectric vibration component array comprises a plurality of piezoelectric vibration components which are arranged according to a set array, the multi-channel signal generator comprises a plurality of signal output channels, the plurality of signal output channels are respectively connected to each piezoelectric vibration component in the piezoelectric vibration component array, the piezoelectric vibration components correspond to the signal output channels one by one, the piezoelectric vibration components are connected with the mounting seat (4) through the connecting fixing piece (3), and the mounting seat (4) is used for mounting an elastic wave spin source;
a plurality of signal output channels of the multi-channel signal generator respectively output a plurality of electric signals with different phases, each piezoelectric vibration component in the piezoelectric vibration component array respectively receives the electric signal of each channel, converts the electric signal into mechanical vibration and transmits the mechanical vibration to an elastic wave spin source on the mounting seat (4) to complete the excitation of the elastic wave spin source;
the piezoelectric vibration component comprises a piezoelectric sheet (1) and a metal column (2), the piezoelectric sheet (1) is an annular piezoelectric sheet and is sleeved on the metal column (2), a through hole is formed in the mounting seat (4), the metal column (2) is sleeved in the through hole of the mounting seat (4), a fixing part (3) is filled and connected between the metal column (2) and the mounting seat (4), the upper surface and the lower surface of the piezoelectric sheet (1) are respectively connected with a positive polarization surface wiring line and a negative polarization surface wiring line, and a wiring positive electrode (5) and a wiring negative electrode (6) of the multichannel signal generator are respectively connected with the positive polarization surface wiring line and the negative polarization surface wiring line of the piezoelectric sheet (1);
the piezoelectric vibration component comprises a piezoelectric sheet (1), wherein the piezoelectric sheet (1) is fixedly arranged on the surface of the mounting seat (4) through a connecting fixing piece (3);
the connecting and fixing piece (3) is made of epoxy resin materials, and the mounting seat (4) is a metal plate or a metal block;
the arrangement mode of the piezoelectric vibration component array is obtained according to the required frequency band of the elastic wave spin source.
2. The multi-channel phase difference controlled elastic wave spin source excitation device according to claim 1, wherein the piezoelectric patches (1) are provided with two pieces, the two pieces are respectively sleeved on the upper end and the lower end of the metal column (2), the mounting seat (4) is provided in the middle of the metal column (2), the piezoelectric patches (1) on the upper end and the lower end of the metal column (2) are symmetrically arranged, and the polarities of the opposite polarization surfaces of the two piezoelectric patches (1) are the same.
3. The excitation device of spin source of elastic wave with multi-channel phase difference control as claimed in claim 1, wherein the connection fixture (3) is filled between the piezoelectric sheet (1) and the metal column (2).
4. The excitation device of spin source of elastic wave with multi-channel phase difference control as claimed in claim 1, wherein said piezoelectric plate (1) is a circular piezoelectric plate, and said connecting fixture (3) is matched with the piezoelectric plate (1) in shape and size, and is filled between the piezoelectric plate (1) and the mounting seat (4).
5. A method for preparing a multichannel phase difference controlled elastic wave spin source excitation device according to any one of claims 1 to 3, comprising the steps of:
s11: acquiring the size, the position and the arrangement mode of the piezoelectric patches (1) according to the required frequency band of the elastic wave spin source;
s12: acquiring the size, the position and the arrangement mode of the metal posts (2) according to the principle corresponding to the size, the position and the arrangement mode of the piezoelectric sheets (1);
s13: according to the principle corresponding to the size, position and arrangement mode of the metal column (2), the size, position and arrangement mode of the four through holes on the mounting seat (4) are obtained;
s14: preparing the piezoelectric sheet (1), the metal column (2) and the mounting seat (4) according to the size, the position and the arrangement determined in the steps S11-S12;
s15: mounting the metal column (2) in a through hole of the mounting seat (4) through the connecting fixing piece (3);
s16: two piezoelectric sheets (1) are respectively arranged at the two ends of each metal column (2) at the same distance from the mounting seat (4) and are fixed by connecting and fixing pieces (3) to form a group of piezoelectric vibration components;
s17: according to the principle that the polarities of opposite polarization surface wiring of the two piezoelectric patches (1) are the same, leads are respectively led out from the upper and lower polarization surface wiring of each piezoelectric patch (1), and each group of piezoelectric vibration components are sequentially connected into a signal output channel of the multi-channel signal generator;
s18: and adjusting the phase difference of each channel of the multi-channel signal generator to generate a spin source.
6. A method for preparing a multichannel phase difference controlled elastic wave spin source excitation device according to claim 1 or 4, comprising the following steps:
s21: acquiring the size, the position and the arrangement mode of the piezoelectric patches (1) according to the required frequency band of the elastic wave spin source;
s22: according to the size, the position and the arrangement mode determined in the steps S11-S12, the piezoelectric sheet (1) is installed on the installation seat (4) through the connecting fixing piece (3);
s23: leads are respectively led out from the wiring of the upper and lower polarization surfaces of each piezoelectric patch (1), and each group of piezoelectric vibration components are sequentially connected into a signal output channel of the multi-channel signal generator;
s24: and adjusting the phase difference of each channel of the multi-channel signal generator to generate a spin source.
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