Device for underwater three-dimensional focusing based on ultrasonic artificial materials

Abstract

The present invention provides a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials, which belongs to the field of acoustics and has the following characteristics: a bottom base, which is a disk structure; and a plurality of raised units, which are connected to the same side of the bottom base and arranged in sequence along the radial direction of the bottom base, each raised unit is a closed structure arranged around the central axis of the bottom base, wherein the longitudinal cross-section of the raised unit is triangular. The device has a compact structure, a simple design, and a low manufacturing cost. It does not require any circuit control means and can achieve a three-dimensional focusing function only by its own structural characteristics. The device also has the advantages of high focusing resolution, a wide effective frequency range, and adjustable focal length. It has very important application value in the fields of medical ultrasonic detection, ultrasonic imaging, ultrasonic therapy, etc., and provides new ideas for the design of multifunctional compact acoustic components.

Description

Technical Field

[0001] The present invention belongs to the field of acoustics, and in particular relates to a device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials. Background Art

[0002] Ultrasonic focusing has excellent tissue penetration and biocompatibility, allowing it to propagate deep within biological tissues. Its advantages include being non-destructive, safe, and portable, and it is widely used in biomedical testing, imaging, and therapy. In recent years, with the development of artificial ultrasound materials, the design of novel ultrasound focusing devices aimed at achieving diverse ultrasound focusing has become a hot topic of research both domestically and internationally. Traditional ultrasound focusing methods primarily include spherical self-focusing, acoustic lens focusing, and active phased array focusing. However, spherical self-focusing utilizes geometric spherical curves to achieve focusing, which is difficult to manufacture and hinders broadband focusing. Acoustic lens focusing utilizes the refractive properties of sound waves to alter the propagation path of the sound beam, but it is complex and lacks robustness. Active phased array focusing requires a large number of transducers and complex circuit systems, resulting in high maintenance costs. Furthermore, conventional ultrasound focusing methods are limited by the properties of traditional natural materials, making it difficult to freely and arbitrarily manipulate ultrasound waves. This significantly restricts the resolution of ultrasound focusing and its flexibility in practical applications. Summary of the Invention

[0003] The present invention is made to solve the above problems, and its purpose is to provide a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials, which can form concentrated reflection of sound waves so that the reflected sound waves converge at the same point, thereby efficiently achieving underwater three-dimensional broadband focusing.

[0004] The present invention provides a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials, which has the following characteristics: a bottom base, which is a disc structure; and a plurality of protrusion units, which are connected to the same side surface of the bottom base and arranged in sequence along the radial direction of the bottom base, each protrusion unit is a closed structure arranged around the central axis of the bottom base, wherein the longitudinal cross-section of the protrusion unit is a triangle.

[0005] In the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention, it may also have the following features: wherein, the protrusion unit has a bottom surface, a first inclined surface and a second inclined surface, the bottom surface is connected to the bottom base, the first inclined surface is closer to the central axis than the second inclined surface, and the first inclined surface is perpendicular to the second inclined surface.

[0006] The device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention may also have the following features: wherein the angle between the first inclined surface and the bottom surface is α,

[0007]

[0008] In the above formula, F represents the distance from the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials to the focus, the focus is located on the central axis, and x represents the distance from the protrusion unit to the central axis.

[0009] The device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention may further have the following characteristics: wherein the distance between the intersection of the first inclined surface and the second inclined surface and the bottom surface is h, h=0.5λ0, λ0 is the reference wavelength, and the difference between the outer diameter and the inner diameter of the bottom surface is d,

[0010] The device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention may also have the following feature: wherein the thickness of the bottom base is l, where l=2λ0.

[0011] The device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention may also have the following feature: wherein all the protruding units are sequentially connected along the radial direction of the bottom base.

[0012] The device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention may also have the following feature: the bottom base and all the protruding units are integrally formed.

[0013] The device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials provided by the present invention may also have the following characteristics: wherein, the material of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials is a material whose acoustic impedance is greater than 20 times the acoustic impedance of water.

[0014] Functions and effects of the invention

[0015] The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials according to the present invention comprises a bottom base and multiple raised units. The bottom base is a disc-shaped structure. The raised units are connected to the same side of the bottom base and arranged radially in sequence. Each raised unit is a closed structure arranged around the center of the bottom base, and the longitudinal cross-section of each raised unit is triangular. In actual use, the device is placed in water and an incident ultrasonic wave is transmitted vertically downward to the device. The device can form a concentrated reflection of the incident sound wave, causing the reflected sound waves to converge at a single point, thereby achieving a significant three-dimensional focusing effect.

[0016] Furthermore, the device boasts a compact structure, simple design, and low manufacturing cost. It requires no circuit control, achieving the aforementioned functions solely through its structural characteristics. With advantages such as high focusing resolution, a wide effective frequency range, and adjustable focal length, the device has significant application value in medical ultrasound testing, ultrasound imaging, and ultrasound therapy, providing new insights into the design of multifunctional, compact acoustic focusing components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the use principle of the device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention;

[0018] Figure 2 3D schematic diagram of a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention;

[0019] Figure 3 is a top view of a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention;

[0020] Figure 4 is a side sectional view of a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention;

[0021] Figure 5 yes Figure 4 A magnified schematic diagram of part A;

[0022] Figure 6 is a three-dimensional cross-sectional diagram of the normalized sound intensity distribution in the focal area of ​​the device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is 1 MHz;

[0023] Figure 7 is a radial normalized sound intensity curve of the focus of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is 1 MHz;

[0024] Figure 8 is an axial normalized sound intensity curve of the focus of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is 1 MHz;

[0025] Figure 9 It is a focal length distribution curve of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is in the range of 0.5-1.4 MHz. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments and accompanying drawings specifically illustrate the device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials of the present invention.

[0027] <Example>

[0028] Figure 1 It is a schematic diagram of the use principle of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention.

[0029] like Figure 1 As shown, the device 100 for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in this embodiment is used to focus ultrasonic waves underwater. When ultrasonic waves propagating vertically downward are incident on the device 100, the device can generate concentrated reflections of the sound waves, causing the reflected sound waves to converge at the same point, thereby achieving a three-dimensional focusing effect. Figure 1 The solid arrow indicates the propagation direction of the incident ultrasonic wave, the dotted arrow indicates the propagation direction of the reflected ultrasonic wave, and the focal area of ​​the reflected sound wave is the focus.

[0030] Figure 2 3D schematic diagram of a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention; Figure 3 is a top view of a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention; Figure 4 is a side sectional view of a device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0031] like Figure 2-5 As shown, the device 100 for achieving underwater three-dimensional focusing based on ultrasonic artificial materials in this embodiment includes a bottom base 10 and a plurality of protruding units 20 .

[0032] The bottom base 10 is a disc structure with two flat sides.

[0033] The plurality of protrusion units 20 are connected to the same side surface of the bottom base 10 and are arranged in sequence along the radial direction of the bottom base 10. All the protrusion units 20 are connected in sequence along the radial direction of the bottom base 10. Each protrusion unit 20 includes a bottom surface 21, a first inclined surface 22, and a second inclined surface 23.

[0034] like Figure 4 、 5As shown, the longitudinal section of the protrusion unit 20 is a right triangle. The bottom surface 21 is flat and the entire bottom surface 21 is connected to the bottom base 20. The first inclined surface 22 is closer to the central axis of the bottom base 10 than the second inclined surface 23. The first inclined surface 22 is perpendicular to the second inclined surface 23.

[0035] The bottom surface 21 closest to the central axis of the bottom base 10 is circular, while the remaining bottom surfaces 21 are annular. All bottom surfaces 21 are coaxial, and their axes coincide with the central axis of the bottom base 10. In other words, the raised unit 20 is a closed structure arranged around the central axis of the bottom base 10.

[0036] The angle between the first inclined surface 22 and the bottom surface 21 is α, and the value of α can be adjusted according to the distance between the device 100 and the focus and the distance between the protruding unit 20 and the central axis in actual application. Specifically,

[0037]

[0038] In the above formula, F represents the distance from the device 100 for underwater three-dimensional focusing based on ultrasonic artificial materials to the focal point (referred to as the focal length). The focal point is located on the central axis of the bottom base 10, and x represents the distance from the protrusion unit 20 to the central axis of the bottom base 10. The so-called "focal point" refers to the area with the most concentrated focused energy, that is, the area with the highest sound intensity, and is often represented as an elliptical sphere in three-dimensional space. The focal length is a preset value before the structure is designed.

[0039] The distance between the intersection of the first inclined surface 22 and the second inclined surface 23 and the bottom surface 21 is h, h = 0.5λ0; the thickness of the bottom base 10 is l, l = 2λ0; the difference between the outer diameter and the inner diameter of the bottom surface 21 is d, Wherein, λ0 is a reference wavelength, which is a value determined according to a specified (set) incident frequency. Specifically, Where c is the speed of sound in water (1500 m / s), and f is the specified (set) incident frequency (i.e., 1 MHz in this embodiment). In this embodiment, the device 100 for achieving underwater three-dimensional focusing based on ultrasonic artificial materials is designed for an incident frequency of 1 MHz. That is, f is 1 MHz, and the corresponding λ0 = 1.5 mm. In actual applications, the specified (set) incident frequency can also be other than 1 MHz.

[0040] In this embodiment, the focal length F is 46 mm, the radius of the bottom base 10 is 48 mm, and the number of the protruding units 20 is 14. In actual use, the focal position, the radius of the bottom base 10, and the number of the protruding units 20 can be adjusted according to actual needs.

[0041] The base 10 and all of the raised units 20 are integrally formed, forming the entire device 100 for underwater 3D focusing based on ultrasonic artificial materials. The device 100 is both axially and centrally symmetrical. The entire device 100 is constructed of ultrasonic artificial materials with an acoustic impedance greater than 20 times that of water, such as stainless steel.

[0042] When in use, the protruding units 20 of the device 100 for achieving underwater three-dimensional focusing based on ultrasonic artificial materials face the incident ultrasonic waves.

[0043] Figure 6 It is a three-dimensional cross-sectional diagram of the normalized sound intensity distribution in the focal area of ​​the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is 1 MHz.

[0044] like Figure 6 As shown, we conducted specific experiments to verify the focusing effect of the device 100 designed to achieve underwater three-dimensional focusing based on ultrasonic artificial materials (hereinafter referred to as device 100). In the experiment, the frequency of the incident ultrasonic wave was 1 MHz, and the background medium was set to water, with a density and sound speed of 1000 kg / m 3 and 1500m / s; the material of the device 100 for realizing underwater three-dimensional focusing based on ultrasonic artificial materials is stainless steel with a density of 7850kg / m 3 , the speed of sound is 5740 m / s. The reference wavelength λ0 of device 100 is 1.5 mm. The center of device 100 for underwater three-dimensional focusing based on ultrasonic artificial materials is the coordinate origin. The three-dimensional cross-sectional diagram clearly shows that the focus is ellipsoidal. The distance between the focus and the plane of device 100, i.e., the focal length, is 46.75 mm in simulation and 47.025 mm in experiment. The relative error between the two is only 0.59%, indicating precise focusing.

[0045] Figure 7 is a radial normalized sound intensity curve of the focus of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is 1 MHz; Figure 8 It is an axial normalized sound intensity curve of the focus of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is 1 MHz.

[0046] like Figure 7 、 8As shown in the normalized sound intensity curves of the radial (x direction) and axial (z direction) of the focus when the incident ultrasonic frequency is 1 MHz, the dots represent the experimental results, and the lines represent the simulation results. There is good consistency between the experiment and the simulation, which verifies that the designed device 100 can effectively achieve underwater three-dimensional focusing when the incident ultrasonic wave is 1 MHz. Focusing resolution is a key indicator for evaluating the quality of ultrasonic focusing effect, and is often measured by the half-maximum full width. The half-maximum full width is defined as the peak width at half the peak of the sound intensity. The smaller the half-maximum full width, the higher the focusing resolution and the better the focusing effect. From Figure 7 、 8 It can be seen that the simulated radial full width at half maximum is 0.63 wavelengths, and the axial full width at half maximum is 2.75 wavelengths; the experimental radial full width at half maximum is 0.89 wavelengths, and the axial full width at half maximum is 3.54 wavelengths, which are better than the existing ultrasonic focusing means. The present invention achieves a significant focusing effect, with high focusing resolution, small ultrasonic energy attenuation, low loss, and excellent focusing performance.

[0047] Figure 9 It is a focal length distribution curve of the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials in an embodiment of the present invention when the incident ultrasonic frequency is in the range of 0.5-1.4 MHz.

[0048] like Figure 9 As shown in the figure, when the frequency of the incident ultrasonic wave is changed within the range of 0.5-1.4 MHz, the designed device 100 still has a good focusing effect, which proves the broadband characteristics of underwater three-dimensional ultrasonic focusing, and its bandwidth is about 1.5 octaves. The experimental results are highly consistent with the simulation results, and the focusing position is accurate. At the same time, we can clearly notice that the focal length changes with the change of the incident sound wave frequency and shows an approximately linear growth trend. The focal length can be adjusted within 18.5-71 mm, and its controllable range reaches 52.5 mm. This shows that the designed device 100 has the characteristics of a wide effective frequency range and adjustable focal length, which has important practical value for three-dimensional underwater focusing.

[0049] Functions and Effects of the Embodiments

[0050] The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials, as described in this embodiment, comprises a base and multiple raised units. The base is a disc-shaped structure, and the raised units are connected to the same side surface of the base and arranged radially in sequence. Each raised unit is a closed structure arranged around the center of the base, and the longitudinal cross-section of each raised unit is triangular. In actual use, the device is placed in water and an incident ultrasonic wave is propagated vertically downward toward the device. The device can generate concentrated reflections of the incident sound waves, causing the reflected sound waves to converge at a single point, thereby achieving a significant three-dimensional focusing effect.

[0051] In addition, the device has a compact structure, simple design, and low production cost. It does not require any circuit control means and can achieve the above functions solely by relying on its own structural characteristics.

[0052] Furthermore, the device is made of a material with an acoustic impedance 20 times greater than that of water, and has a wide range of optional materials and strong practicality.

[0053] Furthermore, when the incident ultrasonic frequency is 1 MHz, the focusing device has a focal length of 46.75 mm, a radial full width at half maximum of 0.63 wavelengths, and an axial full width at half maximum of 2.75 wavelengths, which is superior to existing focusing methods. Three-dimensional focusing can be achieved when the incident ultrasonic frequency is in the range of 0.5-1.4 MHz, with a wide focusing bandwidth of approximately 1.5 octaves. Furthermore, its focal length shows an approximately linear growth trend with frequency changes and can be adjusted within a range of 18.5-71 mm, with a controllable range of 52.5 mm. This device has the advantages of high focusing resolution, a wide effective frequency range, and adjustable focal length. It has very important application value in medical ultrasonic testing, ultrasonic imaging, ultrasonic therapy, and other fields, and provides new ideas for the design of multifunctional and compact acoustic components.

[0054] The above embodiments are preferred examples of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials, characterized in that: include: The bottom base is a disc structure; as well as A plurality of protrusion units are connected to the same side surface of the bottom base and are arranged in sequence along the radial direction of the bottom base. Each of the protrusion units is a closed structure arranged around the central axis of the bottom base. Wherein, the longitudinal section of the protruding unit is a triangle. The protrusion unit has a bottom surface, a first inclined surface and a second inclined surface, the bottom surface is connected to the bottom base, the first inclined surface is closer to the central axis than the second inclined surface, and the first inclined surface is perpendicular to the second inclined surface. The included angle between the first inclined surface and the bottom surface is α, In the above formula, F represents the distance from the device for realizing underwater three-dimensional focusing based on ultrasonic artificial materials to the focus, the focus is located on the central axis, and x represents the distance from the protruding unit to the central axis.

2. The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials according to claim 1, characterized in that: in, The distance between the intersection of the first inclined surface and the second inclined surface and the bottom surface is h, h=0.5λ0, λ0 is the reference wavelength, The difference between the outer diameter and the inner diameter of the bottom surface is d, 3. The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials according to claim 2, characterized in that: in, The thickness of the bottom base is l, where l=2λ0.

4. The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials according to claim 1, characterized in that: in, All the protruding units are connected in sequence along the radial direction of the bottom base.

5. The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials according to claim 1, characterized in that: in, The bottom base and all the protruding units are formed integrally.

6. The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials according to claim 1, characterized in that: in, The device for achieving underwater three-dimensional focusing based on ultrasonic artificial materials is made of a material whose acoustic impedance is 20 times greater than the acoustic impedance of water.

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