Ring-shaped high-precision focusing barrel-shaped metasurface structure and application thereof

Abstract

The invention provides an annular high-precision focusing barrel-shaped metasurface structure, the metasurface structure is composed of 30 annular steel bars with different sizes, and a stable annular shell-shaped integral structure is formed by accurately designing the sizes and arrangement of the annular steel bars; the outer radius of the metasurface structure is 10 lambda, the height of the metasurface structure is 12.5 lambda, and lambda is the wavelength of incident waves. According to the metasurface structure, the size and the shape of each annular steel bar are meticulously designed to ensure that sound waves can be effectively controlled and guided in the focusing process, and then the preset focusing effect is achieved. The design not only has high structural stability, but also has strong manufacturability, and an efficient and economical solution is provided for application of a sound wave focusing technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of acoustic materials, and in particular relates to a circular high-precision focusing barrel-shaped super surface structure and its application. Background Art

[0002] Acoustic wave focusing technology utilizes the wave characteristics of sound waves when propagating in different media, and concentrates the sound wave energy on a specific target area by precisely designing the sound source array. Since its first application in the field of ultrasonic imaging and treatment in the early 20th century, this technology has expanded to multiple disciplines such as medicine, industry, and physics, showing broad application prospects. With the rapid development of computer technology and materials science, the accuracy and efficiency of acoustic wave focusing technology have been significantly improved, especially in high-precision fields such as tumor treatment and non-destructive testing of materials. However, despite the continuous development of technology, acoustic wave focusing technology still faces many challenges in practical applications, which require further research and optimization.

[0003] First of all, improving focusing accuracy is one of the key directions of current acoustic wave focusing research. The propagation characteristics of sound waves in different media are significantly affected by physical properties, and the propagation direction and speed vary with the medium. In addition, there is a complex balance between the frequency and propagation loss of sound waves. Although high-frequency sound waves can achieve higher focusing accuracy, they are prone to severe attenuation during propagation. Therefore, how to effectively reduce propagation loss while improving focusing accuracy has become a core research topic in the field of acoustics.

[0004] In addition to focusing accuracy, the cost and production difficulty of acoustic focusing technology also restrict its widespread application. In current research, many focusing schemes are difficult to mass-produce due to complex designs or expensive materials. Therefore, how to ensure focusing effect and production feasibility while reducing costs is an important challenge. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a circular high-precision focusing barrel-shaped metasurface structure in view of the deficiencies of the above-mentioned prior art. The present invention combines the ADE (advanced differential evolution) optimization algorithm to provide an economical and easy-to-manufacture feasible solution for focusing sound waves in water media. By precisely designing the metasurface structure, a high-precision focusing effect is achieved, while the manufacturing cost and technical difficulty are greatly reduced, providing new breakthroughs and possibilities for the practical application of sound wave focusing technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a circular high-precision focusing barrel-shaped supersurface structure, the supersurface structure is composed of 30 unit cells, the 30 unit cells are 30 annular steel bars with the same outer diameter and different inner diameters; the outer radius of the supersurface structure is 10λ, and the height is 12.5λ, where λ is the wavelength of the incident wave.

[0007] Preferably, the metasurface structure is cut longitudinally, and 30 unit cells are obtained from the longitudinal section, each of which has a height of a=0.417λ, and the widths of the 30 unit cells from bottom to top are: x 1 =0.5λ,x 2 =0.21λ,x 3 =0.31λ,x 4 =0.003λ,x 5 =0.12λ,x 6 =0.5λ,x 7 =0.18λ,x 8 =0.46λ,x 9 =0.19λ,x 10 =0.32λ,x 11 =0.48λ,x 12 =0.5λ,x 13 =0.41λ,x 14 =0.5λ,x 15 =0.44λ,x 16 =0.26λ,x 17 =0.31λ,x 18 =0.31λ,x 19 =0.11λ,x 20 =0.13λ,x 21 =0.50λ,x 22 =0.16λ,x 23 =0.16λ,x 24 =0.26λ,x 25 =0.37λ,x 26 =0.28λ,x 27 =0.19λ,x 28 =0.5λ,x 29 =0.09λ,x 30 =0.38λ.

[0008] The present invention also provides an application of the above-mentioned annular high-precision focusing barrel-shaped supersurface structure, and the supersurface structure is used in tumor treatment.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] 1. The theoretical basis of the generalized Snell's law comes from Fermat's principle, which states that light propagates along the path that minimizes the propagation time. This principle shows that the path that a wave propagates also corresponds to the phase change during the propagation process. Therefore, the generalized form of sound waves can be derived, where:

[0011]

[0012] Here, λ represents the wavelength and dφ / dx is the phase gradient along the propagation direction.

[0013] For sound waves, when the incident sound wave is vertical, the generalized Snell's law can be simplified to the following form:

[0014]

[0015] By adjusting the frequency of the sound waves, the reflection angle at normal incidence can be tuned. This is achieved by changing the phase change of the reflecting surface, for example through specially designed acoustic microstructures (such as grooves), which are able to change the phase of the reflected wave according to the design.

[0016] This method makes it possible to precisely control the reflection direction and angle of sound waves under specific conditions, opening up the possibility for innovative applications in fields such as architectural acoustics and medical ultrasound.

[0017] The ADE (advanced differential evolution) algorithm is an improved version of the traditional differential evolution (DE) algorithm, which proposes a new optimization algorithm. By introducing an optimization channel, it can effectively balance exploration and utilization, thereby avoiding falling into a local minimum. In addition, the ADE algorithm uses chaos theory to achieve diversified initialization, which significantly improves the quality of the solution and the convergence speed. Compared with traditional optimization methods such as genetic algorithms (GA) and particle swarm optimization (PSO), the ADE algorithm has higher advantages in computational efficiency and optimization performance.

[0018] The present invention is based on the generalized Snell's law and combined with the ADE algorithm. The barrel boundary is divided into 30 equal parts, its boundary length is optimized, and the upper limit of the length of each unit cell is set to 0.2λ, thereby obtaining a circular barrel-shaped metasurface structure with a high-precision focusing effect.

[0019] The metasurface structure is composed of 30 annular steel bars of different sizes. By precisely designing the size and arrangement of these annular steel bars, a stable torus-shaped overall structure is formed. The generalized Snell's law is used to optimize the propagation characteristics of sound waves, and the ADE algorithm is combined to fine-tune the structural parameters to ensure that the sound waves can be accurately controlled and guided during the focusing process, thereby achieving a high-precision focusing effect. Compared with the prior art, the present invention only uses ordinary steel as a structural material, which significantly reduces the production cost and improves the feasibility of manufacturing, solving the production limitation problem caused by high material cost and difficulty in manufacturing in traditional technology.

[0020] 2. The size and shape of each annular steel bar used in the metasurface structure of the present invention are carefully designed to ensure that the sound waves can be effectively controlled and guided during the focusing process, thereby achieving the predetermined focusing effect. This design not only has a high degree of structural stability, but also has strong manufacturability, providing an efficient and economical solution for the application of sound wave focusing technology.

[0021] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 (a) is a schematic diagram of the circular ring-shaped high-precision focusing barrel-shaped supersurface structure of the present invention, and (b) is an internal cross-sectional view of the circular ring-shaped high-precision focusing barrel-shaped supersurface structure of the present invention.

[0023] Figure 2 It is a detailed diagram of the two-dimensional half-side cross-section geometric dimensions of the water medium inside the circular high-precision focusing barrel-shaped supersurface structure of the present invention.

[0024] Figure 3 This is a comparison of the sound intensity field before and after adding the circular high-precision focusing barrel-shaped metasurface structure.

[0025] Figure 4 (a) is a two-dimensional radial point source focusing effect diagram, and (b) is a three-dimensional point source focusing effect diagram. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] This embodiment provides a circular high-precision focusing barrel-shaped metasurface structure ( Figure 1 As shown), the metasurface structure is composed of 30 unit cells, and the 30 unit cells are 30 steel bars with the same outer diameter and different inner diameters; the outer radius (l) of the metasurface structure is 10λ, and the height (length) is 12.5λ, where λ is the wavelength of the incident wave; the metasurface structure is cut longitudinally, and 30 unit cell blocks ( Figure 2 As shown), the height of each unit cell block is a=0.417λ, and the widths of the 30 unit cell blocks from bottom to top are: x 1 =0.5λ,x 2 =0.21λ,x 3 =0.31λ,x 4 =0.003λ,x 5 =0.12λ,x 6 =0.5λ,x 7 =0.18λ,x 8 =0.46λ,x 9 =0.19λ,x 10 =0.32λ,x 11 =0.48λ,x 12 =0.5λ,x 13 =0.41λ,x 14 =0.5λ,x 15 =0.44λ,x 16 =0.26λ,x 17 =0.31λ,x 18 =0.31λ,x 19 =0.11λ,x 20 =0.13λ,x 21 =0.50λ,x 22 =0.16λ,x 23 =0.16λ,x 24 =0.26λ,x 25 =0.37λ,x 26 =0.28λ,x 27 =0.19λ,x 28 =0.5λ,x 29 =0.09λ,x 30 =0.38λ.

[0029] Experiment 1

[0030] The annular high-precision focusing barrel-shaped metasurface structure in this embodiment was simulated and verified in COMSOL Multiphysics 6.1 based on the simulation condition of 5000 Hz. In order to verify the effect of the metasurface structure of the present invention, a blank control was set up, and the changes in sound intensity before and after the addition of the metasurface structure were compared. When the metasurface structure designed by the present invention is not used, the propagation of the sound wave is relatively uniform, and the sound intensity in the focus area is low.

[0031] The simulation results are as follows Figure 3 As shown in the figure, the simulation results show that under the condition of 5000Hz, the sound intensity in the focal point area increases by 40 times. This result shows that the metasurface can effectively guide and concentrate the energy of sound waves, thereby greatly improving the focusing effect and effectively reducing the energy loss during propagation.

[0032] This technical effect is of great significance in precise application fields such as tumor treatment and material testing. Through this simulation, not only the remarkable effect of the super surface structure of the present invention in improving the accuracy of acoustic wave focusing is verified, but also its high efficiency and low cost manufacturing advantages are proved, while simplifying the production process. Therefore, the super surface structure of the present invention has strong industrial production potential and broad application prospects.

[0033] Experiment 2

[0034] According to the design and experimental simulation of the above-mentioned experiment 1, the annular high-precision focusing barrel-shaped metasurface structure showed significant technical effects under 5000Hz conditions. First, by simulating the performance of the metasurface structure in water, the results showed that at this frequency, the metasurface structure can achieve a highly accurate sound wave focusing effect. This effect is achieved thanks to the precise design and arrangement of 30 annular steel bars of different sizes in the metasurface, which effectively guide the sound waves and achieve the predetermined focus.

[0035] Specifically, the simulation yielded the sound intensity field diagram, such as Figure 4 As shown in (a) and (b), the figure clearly shows the distribution of sound waves in the focal area. At a frequency of 5000 Hz, the metasurface can form a strong sound intensity peak near the focal point, indicating that the sound wave energy has been highly concentrated in a specific area. This technical advantage has important practical significance for high-precision applications such as tumor treatment and material testing.

[0036] Through this experimental simulation result, it can be seen that the metasurface structure of the present invention can effectively reduce propagation loss while improving the accuracy of acoustic wave focusing, and its design is simple, economical and practical, with strong industrial production potential and application prospects. Therefore, the application of this technology can achieve excellent results in a variety of acoustic fields, especially in the context of low-cost and efficient manufacturing.

[0037] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A circular high-precision focusing barrel-shaped metasurface structure, characterized in that: The metasurface structure is composed of 30 unit cells, which are 30 annular steel bars with the same outer diameter and different inner diameters. The outer radius of the metasurface structure is 10λ, and the height is 12.5λ, where λ is the wavelength of the incident wave.

2. The annular high-precision focusing barrel-shaped metasurface structure according to claim 1, characterized in that: The metasurface structure is cut longitudinally, and 30 unit cells are obtained from the longitudinal section. The height of each unit cell is a=0.417λ, and the widths of the 30 unit cells from bottom to top are: x1=0.5λ, x2=0.21λ, x3=0.31λ, x4=0.003λ, x5=0.12λ, x6=0.5λ, x7=0.18λ, x8=0.46λ, x9=0.19λ, x 10 =0.32λ,x 11 =0.48λ,x 12 =0.5λ,x 13 =0.41λ,x 14 =0.5λ,x 15 =0.44λ,x 16 =0.26λ,x 17 =0.31λ,x 18 =0.31λ,x 19 =0.11λ,x 20 =0.13λ,x 21 =0.50λ,x 22 =0.16λ,x 23 =0.16λ,x 24 =0.26λ,x 25 =0.37λ,x 26 =0.28λ,x 27 =0.19λ,x 28 =0.5λ,x 29 =0.09λ,x 30 =0.38λ.

3. An application of the annular high-precision focusing barrel-shaped super surface structure as claimed in claim 1 or 2, characterized in that: The super surface structure is used in tumor treatment.

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