CN215069233U - Super-surface device for realizing underwater broadband ultrasonic focusing - Google Patents
Super-surface device for realizing underwater broadband ultrasonic focusing Download PDFInfo
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- CN215069233U CN215069233U CN202120678557.6U CN202120678557U CN215069233U CN 215069233 U CN215069233 U CN 215069233U CN 202120678557 U CN202120678557 U CN 202120678557U CN 215069233 U CN215069233 U CN 215069233U
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Abstract
The utility model provides a super surface device for realizing under water broadband supersound focus has such characteristic, include: the bottom base is of a disc structure; and the plurality of protruding units are connected to the same side face of the bottom base and are sequentially arranged along the radial direction of the bottom base, wherein the longitudinal section of each protruding unit is triangular, each protruding unit is provided with a bottom face, a first inclined face and a second inclined face, the bottom face is connected with the bottom base, the first inclined face is closer to the central axis of the bottom base than the second inclined face, the bottom face closest to the central axis in all the bottom faces is circular, the rest bottom faces are circular, and all the bottom faces are coaxial. The device has the advantages of compact structure, simple design, low manufacturing cost, no need of any circuit regulation and control means, realization of the three-dimensional focusing function only by the structural characteristics of the device, high focusing resolution, wide effective frequency range, adjustable focal length and the like.
Description
Technical Field
The utility model belongs to the acoustics field, concretely relates to super surface device for realizing underwater broadband supersound focus.
Background
The ultrasonic focusing has good tissue penetrability and biocompatibility, can be transmitted in deeper biological tissues, has the advantages of no damage, safety, portability and the like, and is widely applied to biomedical detection, imaging and treatment. In recent years, with the development of ultrasonic artificial materials, designing a novel ultrasonic focusing device aiming at realizing diversified ultrasonic focusing has become a hot point of domestic and foreign research. The traditional ultrasonic focusing method mainly comprises spherical self-focusing, acoustic lens focusing and active phased array focusing. However, the spherical self-focusing method utilizes a geometric spherical curve to realize focusing, has high manufacturing difficulty and is difficult to realize broadband focusing; the acoustic lens focusing method realizes focusing by changing the propagation path of an acoustic beam by utilizing the refraction property of the acoustic wave, but has a complex structure and poor robustness; the active phased array focusing method requires a large number of transducers and complex circuitry, and is costly to maintain. In addition, the conventional ultrasonic focusing method is limited by the properties of the traditional natural materials, and the free and arbitrary manipulation of the ultrasonic wave is difficult to realize, which greatly limits the resolution and flexibility of the ultrasonic focusing in practical application.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned problem and go on, aim at provides a super surface device for realizing broadband supersound focus under water, can form concentrated reflection to the sound wave for the reflection sound wave converges in the same point, thereby realizes three-dimensional broadband focus under water high-efficiently.
The utility model provides a super surface device for realizing under water broadband supersound focus has such characteristic, include: the bottom base is of a disc structure; and the plurality of protruding units are connected to the same side face of the bottom base and are sequentially arranged along the radial direction of the bottom base, wherein the longitudinal section of each protruding unit is triangular, each protruding unit is provided with a bottom face, a first inclined face and a second inclined face, the bottom face is connected with the bottom base, the first inclined face is closer to the central axis of the bottom base than the second inclined face, the bottom face closest to the central axis in all the bottom faces is circular, the rest bottom faces are circular, and all the bottom faces are coaxial.
The utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: wherein, the first inclined plane is perpendicular to the second inclined plane.
The utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: wherein the included angle between the first inclined plane and the bottom surface is alpha,
in the above formula, F represents the distance from the super-surface device for realizing underwater broadband ultrasonic focusing to the focal point, the predetermined focal point is located on the central axis, and x represents the distance from the convex unit to the central axis.
The utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: wherein, the distance between the intersection point of the first inclined plane and the second inclined plane and the bottom surface is h, and h is 0.5 lambda0，λ0The difference between the outer diameter and the inner diameter of the bottom surface is d for the reference wavelength,
the utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: wherein the thickness of the bottom base is l, l ═ 2 lambda0。
The utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: wherein, all the protruding units are connected in turn along the radial direction of the bottom base.
The utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: wherein the bottom base is integrally formed with all of the boss units.
The utility model provides an among the super surface means for realizing broadband supersound focus under water, can also have such characteristic: the super-surface device for realizing underwater broadband ultrasonic focusing is a stainless steel super-surface device.
Action and effect of the utility model
According to the utility model relates to a super surface installation for realizing broadband supersound focus under water, including bottom base and a plurality of protruding unit, the bottom base is the disc structure, and a plurality of protruding unit connection are on the same side of bottom base to radially arranging along the bottom base in proper order, the longitudinal section of protruding unit is triangle-shaped, and protruding unit has the bottom surface, and the bottom surface that is closest to the central axis in all bottom surfaces is circular, and remaining bottom surface is ring shape, and all bottom surfaces are coaxial. When the device is used specifically, the device is placed in water, incident ultrasonic waves are vertically transmitted to the device downwards, the device can form concentrated reflection on the incident sound waves, and the reflected sound waves converge at the same point, so that a remarkable three-dimensional focusing effect is achieved.
In addition, the device has compact structure, simple design and low manufacturing cost, does not need any circuit regulation and control means, and can realize the functions only by the structural characteristics of the device. The device has the advantages of high focusing resolution, wide effective frequency range, adjustable focal length and the like, has very important application value in the fields of medical ultrasonic detection, ultrasonic imaging, ultrasonic treatment and the like, and provides a new idea for the design of multifunctional compact acoustic focusing components.
Drawings
Fig. 1 is a schematic diagram of a principle of use of an ultra-surface device for realizing underwater broadband ultrasonic focusing according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a super-surface device for realizing underwater broadband ultrasonic focusing according to an embodiment of the present invention;
fig. 3 is a top view of a super-surface device for implementing underwater broadband ultrasound focusing in an embodiment of the present invention;
fig. 4 is a side cross-sectional view of a super-surface apparatus for implementing underwater broadband ultrasound focusing in an embodiment of the invention;
FIG. 5 is an enlarged schematic view of portion A of FIG. 4;
fig. 6 is a three-dimensional cross-sectional view of a normalized sound intensity distribution of a focal region of a super-surface device for realizing underwater broadband ultrasound focusing in an embodiment of the present invention when an incident ultrasound frequency is 1 MHz;
fig. 7 is a radial normalized sound intensity curve of a focus of the super-surface device for realizing underwater broadband ultrasonic focusing in the embodiment of the present invention when the incident ultrasonic frequency is 1 MHz;
fig. 8 is an axial normalized sound intensity curve of a focus of the super-surface device for realizing underwater broadband ultrasonic focusing in the embodiment of the present invention when the incident ultrasonic frequency is 1 MHz;
fig. 9 is a focal length distribution curve of the super-surface device for realizing underwater broadband ultrasonic focusing in the range of 0.5-1.4MHz of incident ultrasonic frequency in the embodiment of the present invention.
Detailed Description
In order to make the utility model realize that technical means, creation characteristics, achievement purpose and efficiency are easily understood and known, following embodiment combines the attached drawing to be right the utility model is used for realizing making concrete exposition of super surface device of broadband supersound focus under water.
< example >
Fig. 1 is a schematic diagram of a principle of use of an ultra-surface device for realizing underwater broadband ultrasonic focusing according to an embodiment of the present invention.
As shown in fig. 1, the super-surface apparatus 100 for realizing underwater broadband ultrasonic focusing in the present embodiment is used for focusing ultrasonic waves underwater. When the ultrasonic waves vertically propagating downwards are incident to the super-surface device 100 for realizing underwater broadband ultrasonic focusing, the device can form concentrated reflection on the sound waves, so that the reflected sound waves converge at the same point, and the effect of three-dimensional focusing is achieved. In fig. 1, solid arrows indicate the propagation direction of the incident ultrasonic wave, dashed arrows indicate the propagation direction of the reflected ultrasonic wave, and the focal region of the reflected acoustic wave is the focal point.
Fig. 2 is a schematic perspective view of a super-surface device for realizing underwater broadband ultrasonic focusing according to an embodiment of the present invention; fig. 3 is a top view of a super-surface device for implementing underwater broadband ultrasound focusing in an embodiment of the present invention; fig. 4 is a side cross-sectional view of a super-surface apparatus for implementing underwater broadband ultrasound focusing in an embodiment of the invention; fig. 5 is an enlarged schematic view of a portion a in fig. 4.
As shown in fig. 2 to 5, the super-surface device 100 for realizing underwater broadband ultrasonic focusing in the present embodiment includes a base 10 and a plurality of convex units 20.
The bottom base 10 is a disk structure having two flat sides.
The plurality of protrusion units 20 are all connected to the same side of the bottom base 10, and are sequentially arranged in a radial direction of the bottom base 10. All the boss units 20 are connected in sequence in the radial direction of the base 10. Each of the projection units 20 includes a bottom surface 21, a first inclined surface 22, and a second inclined surface 23.
As shown in fig. 4 and 5, the projection unit 20 has a right-angled triangle-shaped longitudinal section. The bottom surface 21 is planar 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 base 10 than the second inclined surface 23. The first inclined surface 22 is perpendicular to the second inclined surface 23.
The bottom surface 21 closest to the central axis of the bottom base 10 among all the bottom surfaces 21 is circular, and the remaining bottom surfaces 21 are circular. All the bottom surfaces 21 are coaxial and their axes coincide with the central axis of the bottom base 10. That is, the projection unit 20 is a closed structure disposed around the central axis of the base 10.
The angle between the first inclined surface 22 and the bottom surface 21 is α, and the size of α can be adjusted according to the distance between the device 100 and the focus and the distance between the protrusion unit 20 and the central axis in practical application, and specifically, the distance between the protrusion unit 20 and the central axis is adjustable
Where F denotes a distance from the super surface apparatus 100 for realizing underwater broadband ultrasonic focusing to a focal point, the focal point being located on the central axis of the bottom base 10, and x denotes a distance from the projection unit 20 to the central axis of the bottom base 10. The "focal point" refers to a region where the focusing energy is most concentrated, i.e., a region where the sound intensity is the greatest, and often appears as an elliptical sphere in three-dimensional space. The focal length is a preset value before the design structure.
The intersection of the first inclined surface 22 and the second inclined surface 23 is spaced from the bottom surface 21 by a distance h of 0.5 λ0(ii) a The thickness of the base 10 is l, l ═ 2 λ0(ii) a The difference between the outer diameter and the inner diameter of the bottom surface 21 is d,
wherein λ is0Is a reference wavelength which is a value determined according to a specified (set) incident frequency, specifically,
where c is the sound velocity of water (1500 m/s) and f is the specified (set) incident frequency (i.e., 1MHz in this example). In this embodiment, the super-surface device 100 for realizing underwater broadband ultrasonic focusing is designed for an incident frequency of 1MHz, that is, f is 1MHz, and λ corresponds to f01.5 mm. In practical applications, the specified (set) incident frequency may also be other than 1 MHz.
In the present embodiment, the focal length F is 46mm, the radius of the bottom base 10 is 48mm, and the number of the convex units 20 is 14. In practical use, the position of the focal point, the radius of the bottom base 10 and the number of the convex units 20 can be adjusted according to practical needs.
The bottom base 10 is integrally formed with all of the protruding units 20, i.e., the entire super-surface apparatus 100 for realizing underwater broadband ultrasonic focusing. The super-surface device 100 for realizing underwater broadband ultrasonic focusing is of an axisymmetric structure and a centrosymmetric structure. The whole material of the super-surface device 100 for realizing underwater broadband ultrasonic focusing is an ultrasonic artificial material, and is a material with acoustic impedance 20 times larger than that of water, such as stainless steel.
In use, the raised elements 20 of the super-surface apparatus 100 for achieving underwater broadband ultrasound focusing are directed towards incident ultrasound waves.
Fig. 6 is a three-dimensional cross-sectional view of a normalized sound intensity distribution of a focal region of a super-surface device for realizing underwater broadband ultrasound focusing in an embodiment of the present invention when an incident ultrasound frequency is 1 MHz.
As shown in FIG. 6, we have conducted a specific experiment to verify the focusing effect of the super-surface device 100 (hereinafter referred to as the device 100) designed to realize underwater broadband ultrasonic focusing, in which the frequency of the incident ultrasonic wave is 1MHz, the background medium is set to be water, and the density and the sound velocity of the water are 1000kg/m respectively3And 1500 m/s; the super-surface device 100 for realizing underwater broadband ultrasonic focusing is made of stainless steel and has the density of 7850kg/m3The speed of sound is 5740 m/s. Reference wavelength λ of device 10001.5 mm. The center position of the super-surface device 100 for realizing underwater broadband ultrasonic focusing is the origin of coordinates. It is clear from the three-dimensional cross-sectional view that the focal point is ellipsoidal, the distance between the focal point and the plane of the device 100, i.e. the focal length, is 46.75mm in the simulation and 47.025mm in the experiment, the relative error between the focal point and the plane of the device is only 0.59%, and the focusing is accurate.
Fig. 7 is a radial normalized sound intensity curve of a focus of the super-surface device for realizing underwater broadband ultrasonic focusing in the embodiment of the present invention when the incident ultrasonic frequency is 1 MHz; fig. 8 is an axial normalized sound intensity curve of a focus of the super-surface device for realizing underwater broadband ultrasonic focusing in the embodiment of the present invention when the incident ultrasonic frequency is 1 MHz.
As shown in fig. 7 and 8, in the normalized sound intensity curves of the radial direction (x direction) and the axial direction (z direction) of the focal point when the incident ultrasonic frequency is 1MHz, the dots represent the experimental results, and the lines represent the simulation results. The experiment and the simulation have good consistency, and the result proves that the designed device 100 can effectively realize underwater three-dimensional focusing under the condition that the incident ultrasonic wave is 1 MHz. The focusing resolution is a key index for evaluating the quality of the ultrasonic focusing effect and is usually measured by the full width at half maximum. The full width at half maximum is defined as the peak width at half of the peak of the sound intensity, and a smaller full width at half maximum represents a higher focusing resolution and a better focusing effect. From FIGS. 7 and 8, 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 full-width at half maximum of the radial of experiment is 0.89 wavelength, and the full-width at half maximum of axial is 3.54 wavelengths, is superior to current supersound focus means, the utility model discloses reached apparent focusing effect, and the focusing resolution ratio is high, and ultrasonic energy decay reduces, the loss is low, and the focusing performance is outstanding.
Fig. 9 is a focal length distribution curve of the super-surface device for realizing underwater broadband ultrasonic focusing in the range of 0.5-1.4MHz of incident ultrasonic frequency in the embodiment of the present invention.
As shown in fig. 9, the designed device 100 still has good focusing effect when the frequency of the incident ultrasonic wave is changed in the range of 0.5-1.4MHz, which proves the broadband characteristic of underwater three-dimensional ultrasonic focusing, and the bandwidth of the device is about 1.5 octaves. The experimental result is highly matched with the simulation result, and the focusing position is accurate. Meanwhile, the focal length can be obviously changed along with the change of the frequency of the incident sound wave and shows a trend of approximately linear growth, the focal length can be adjusted within 18.5-71mm, and the controllable range of the focal length can reach 52.5 mm. This shows that the designed device 100 has the characteristics of wide effective frequency range and adjustable focal length, which has important practical value for three-dimensional underwater focusing.
Effects and effects of the embodiments
According to the super surface installation for realizing underwater broadband ultrasonic focusing that this embodiment relates to, because including bottom base and a plurality of protruding unit, the bottom base is the disc structure, and a plurality of protruding units are connected on the same side of bottom base to radially arranging in proper order along bottom base, the longitudinal section of protruding unit is triangle-shaped, and protruding unit has the bottom surface, and the bottom surface that is closest to the central axis in all bottom surfaces is circular, and remaining bottom surfaces are the ring shape, and all bottom surfaces are coaxial. When the device is used specifically, the device is placed in water, incident ultrasonic waves are vertically transmitted to the device downwards, the device can form concentrated reflection on the incident sound waves, and the reflected sound waves converge at the same point, so that a remarkable three-dimensional focusing effect is achieved.
In addition, the device has compact structure, simple design and low manufacturing cost, does not need any circuit regulation and control means, and can realize the functions only by the structural characteristics of the device.
Furthermore, when the frequency of incident ultrasonic waves is 1MHz, the focal length of the focusing device is 46.75mm, the radial full width at half maximum is 0.63 wavelength, and the axial full width at half maximum is 2.75 wavelength, which is superior to the existing focusing means; when the frequency of incident ultrasonic waves is within the range of 0.5-1.4MHz, three-dimensional focusing can be realized, the focusing frequency band is wide, about 1.5 octaves, the focal length of the ultrasonic wave shows the trend of approximately linear increase along with the frequency change, the ultrasonic wave can be adjusted within the range of 18.5-71mm, and the controllable range of the ultrasonic wave can reach 52.5 mm. The device has the advantages of high focusing resolution, wide effective frequency range, adjustable focal length and the like, has very important application value in the fields of medical ultrasonic detection, ultrasonic imaging, ultrasonic treatment and the like, and provides a new idea for the design of multifunctional compact acoustic elements.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (8)
1. A super-surface device for enabling underwater broadband ultrasound focusing, comprising:
the bottom base is of a disc structure; and
a plurality of convex units which are connected on the same side surface of the bottom base and are sequentially arranged along the radial direction of the bottom base,
wherein the longitudinal section of the protrusion unit is triangular, the protrusion unit is provided with a bottom surface, a first inclined surface and a second inclined surface, the bottom surface is connected with the bottom base, the first inclined surface is closer to the central axis of the bottom base than the second inclined surface,
the bottom surface closest to the central axis in all the bottom surfaces is circular, the rest bottom surfaces are circular, and all the bottom surfaces are coaxial.
2. The super-surface device for enabling underwater broadband ultrasound focusing according to claim 1, wherein:
wherein the first inclined plane is perpendicular to the second inclined plane.
3. The super-surface device for enabling underwater broadband ultrasound focusing according to claim 2, wherein:
wherein the included angle between the first inclined plane and the bottom surface is alpha,
in the above formula, F represents the distance from the super-surface device for realizing underwater broadband ultrasonic focusing to the focal point, the predetermined focal point is located on the central axis, and x represents the distance from the convex unit to the central axis.
4. The super-surface device for enabling underwater broadband ultrasound focusing according to claim 3, wherein:
wherein a distance between an intersection of the first inclined surface and the second inclined surface and the bottom surface is h, and h is 0.5 λ0，λ0For the purpose of the reference wavelength(s),
the difference between the outer diameter and the inner diameter of the bottom surface is d,
5. the super-surface device for enabling underwater broadband ultrasound focusing according to claim 4, wherein:
wherein the bottom base has a thickness of l, l ═ 2 λ0。
6. The super-surface device for enabling underwater broadband ultrasound focusing according to claim 1, wherein:
wherein all the protruding units are sequentially connected along the radial direction of the bottom base.
7. The super-surface device for enabling underwater broadband ultrasound focusing according to claim 1, wherein:
wherein the bottom base is integrally formed with all of the boss units.
8. The super-surface device for enabling underwater broadband ultrasound focusing according to claim 1, wherein:
the super-surface device for realizing underwater broadband ultrasonic focusing is a stainless steel super-surface device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115050348A (en) * | 2022-06-09 | 2022-09-13 | 青岛大学 | Bubble type underwater broadband diffuse reflection coding acoustic super surface and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115050348A (en) * | 2022-06-09 | 2022-09-13 | 青岛大学 | Bubble type underwater broadband diffuse reflection coding acoustic super surface and use method thereof |
| CN115050348B (en) * | 2022-06-09 | 2024-03-22 | 青岛大学 | Bubble type underwater broadband diffuse reflection coding acoustic super surface and application method thereof |
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