Ultrasonic dynamic observation method and device of acoustic metamaterial

Abstract

The application discloses an ultrasonic dynamic observation method and device of an acoustic metamaterial, and relates to the field of ultrasonic dynamic observation of acoustic metamaterials. The method comprises the following steps: acquiring image information of an acoustic metamaterial when an ultrasonic wave acts on the acoustic metamaterial; and recording a frequency value of the ultrasonic wave corresponding to the image information when resonance phenomenon exists. The application realizes dynamic observation of the resonance of an ultrasonic wave on an acoustic metamaterial by acquiring the ultrasonic frequency when the acoustic metamaterial resonates.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic dynamic observation of acoustic metamaterials, and in particular to a method and apparatus for ultrasonic dynamic observation of acoustic metamaterials. Background Technology

[0002] Acoustic metamaterials are artificially designed structural materials that exhibit unusual acoustic properties through structural design, such as negative refraction, acoustic cloaking, extraordinary transmission, and subwavelength imaging. Acoustic metamaterials produce monopole and dipole resonances at specific frequencies. Monopole resonances result in a negative equivalent elastic modulus parameter, while dipole resonances result in a negative equivalent mass density parameter. However, these equivalent acoustic parameters are dynamic and cannot be measured statically.

[0003] Existing technologies all observe the resonance of low-frequency sound waves on acoustic metamaterials, and there is no dynamic observation of the resonance of ultrasonic waves on acoustic metamaterials. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for dynamic ultrasonic observation of acoustic metamaterials, enabling dynamic observation of the resonance of acoustic metamaterials by ultrasonic waves.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] Firstly, an ultrasonic dynamic observation method for acoustic metamaterials includes:

[0007] Acquire image information of the acoustic metamaterial when ultrasound is applied to it;

[0008] Record the frequency value of the ultrasound corresponding to the image information when resonance occurs.

[0009] Optionally, a method for ultrasonic dynamic observation of acoustic metamaterials further includes:

[0010] The transmission coefficient and reflection coefficient of the acoustic metamaterial at the target frequency value are measured; the target frequency value is the frequency value of the ultrasonic wave corresponding to the image information when resonance occurs.

[0011] Based on the transmission coefficient and the reflection coefficient, calculate the negative equivalent elastic modulus parameter and the negative equivalent mass density parameter of the acoustic metamaterial.

[0012] Secondly, an ultrasonic dynamic observation device for acoustic metamaterials includes: an ultrasonic transducer, a microscope, and a processor;

[0013] The ultrasonic transducer is used to output ultrasonic waves; the output port of the ultrasonic transducer is on the same horizontal plane as the acoustic metamaterial, and the acoustic metamaterial is disposed on the microscope.

[0014] The microscope is used to acquire image information of the acoustic metamaterial when the ultrasonic wave acts on it.

[0015] The processor is used for:

[0016] Acquire image information of the acoustic metamaterial when ultrasound is applied to it;

[0017] Record the frequency value of the ultrasound corresponding to the image information when resonance occurs.

[0018] Optionally, the processor is further configured to:

[0019] The transmission coefficient and reflection coefficient of the acoustic metamaterial at the target frequency value are measured; the target frequency value is the frequency value of the ultrasonic wave corresponding to the image information when resonance occurs.

[0020] Based on the transmission coefficient and the reflection coefficient, calculate the negative equivalent elastic modulus parameter and the negative equivalent mass density parameter of the acoustic metamaterial.

[0021] Optionally, the microscope includes: an eyepiece and a stage;

[0022] The eyepiece is used to acquire image information of the acoustic metamaterial when the ultrasonic wave acts on it; the stage is used to place the acoustic metamaterial.

[0023] Optionally, an ultrasonic dynamic observation device for acoustic metamaterials further includes: a signal generator and a power amplifier;

[0024] The signal generator is used to generate a sinusoidal signal. The input terminal of the power amplifier is connected to the signal generator, and the power amplifier is used to amplify the sinusoidal signal. The output terminal of the power amplifier is connected to the input terminal of the ultrasonic transducer. The ultrasonic transducer is used to output ultrasonic waves based on the amplified sinusoidal signal.

[0025] Optionally, an ultrasonic dynamic observation device for acoustic metamaterials further includes: a liquid crystal display; the liquid crystal display is connected to the microscope, and the liquid crystal display is used to display image information of the acoustic metamaterials acquired by the eyepiece.

[0026] Optionally, an ultrasonic dynamic observation device for acoustic metamaterials further includes: a water tank filled with water;

[0027] The ultrasonic transducer, the acoustic metamaterial, and the microscope are disposed in the water tank, and the water in the water tank overflows the ultrasonic transducer and the acoustic metamaterial.

[0028] Optionally, the acoustic metamaterial comprises: a material substrate and microspheres;

[0029] The microspheres are disposed within the material substrate.

[0030] Optionally, the frequency range of the ultrasonic wave is 0-10MHz.

[0031] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0032] This invention provides a method and apparatus for dynamic ultrasonic observation of acoustic metamaterials. The method includes: acquiring image information of the acoustic metamaterial when ultrasonic waves act on it; and recording the frequency value of the ultrasonic waves corresponding to the image information when resonance occurs. This invention achieves dynamic observation of the resonance of acoustic metamaterials by acquiring the ultrasonic wave frequency when resonance occurs. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of an ultrasonic dynamic observation device for acoustic metamaterials provided in Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of the acoustic metamaterial provided in Embodiment 1 of the present invention;

[0036] Figure 3 Image information of the acoustic metamaterial resonating as provided in Embodiment 1 of the present invention;

[0037] Figure 4 This is a schematic diagram of the ultrasonic dynamic observation method for acoustic metamaterials provided in Embodiment 2 of the present invention.

[0038] Symbol explanation:

[0039] Signal generator—1, power amplifier—2, ultrasonic transducer—3, acoustic metamaterial—4, microscope—5, water tank—6, liquid crystal display—7, microspheres—8, material substrate—9. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The purpose of this invention is to provide a method and apparatus for dynamic ultrasonic observation of acoustic metamaterials, enabling dynamic observation of the resonance of acoustic metamaterials by ultrasonic waves.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] Figure 1 This is a schematic diagram of a device for ultrasonic dynamic observation of acoustic metamaterials according to the present invention.

[0045] like Figure 1 As shown, Embodiment 1 of the present invention provides an ultrasonic dynamic observation device for acoustic metamaterials, comprising: an ultrasonic transducer 3, a microscope 5, and a processor.

[0046] The ultrasonic transducer 3 is used to output ultrasonic waves; the output port of the ultrasonic transducer 3 is on the same horizontal plane as the acoustic metamaterial 4; and the acoustic metamaterial 4 is disposed on the microscope 5.

[0047] The microscope 5 is used to acquire image information of the acoustic metamaterial 4 when ultrasound is applied to it.

[0048] The processor is used for:

[0049] Image information of the acoustic metamaterial 4 when ultrasound is applied to it is obtained.

[0050] Record the frequency value of the ultrasound corresponding to the image information when resonance occurs.

[0051] Among them, such as Figure 2 As shown, the acoustic metamaterial 4 includes: a material substrate 9 and microspheres 8.

[0052] The microspheres 8 are disposed within the material substrate 9.

[0053] The resonance is a single-stage resonance, a dipole resonance, or a combination of single-stage and dipole resonance.

[0054] Figure 3 Image information of the acoustic metamaterial 4 of the present invention when it resonates.

[0055] like Figure 3 As shown, the manifestation of the unipolar resonance is that the microsphere 8 expands or contracts; the manifestation of the dipole resonance is that the microsphere 8 moves in all directions; the manifestation of the simultaneous existence of the unipolar resonance and the dipole resonance is that the microsphere 8 both expands or contracts and moves in all directions.

[0056] Furthermore, the processor is also used to determine the transmission coefficient and reflection coefficient of the acoustic metamaterial 4 at the target frequency value; the target frequency value is the frequency value of the ultrasonic wave corresponding to the image information when resonance occurs.

[0057] Based on the transmission coefficient and the reflection coefficient, the negative equivalent elastic modulus parameter and the negative equivalent mass density parameter of the acoustic metamaterial 4 are calculated.

[0058] Specifically, the microscope 5 includes an eyepiece and a stage.

[0059] The eyepiece is used to acquire image information of the acoustic metamaterial 4 when ultrasound is applied to it; the stage is used to place the acoustic metamaterial 4.

[0060] Specifically, the ultrasonic dynamic observation device for acoustic metamaterials provided in Embodiment 1 of the present invention further includes: a signal generator 1 and a power amplifier 2.

[0061] The signal generator 1 is used to generate a sinusoidal signal. The input terminal of the power amplifier 2 is connected to the signal generator 1, and the power amplifier 2 is used to amplify the sinusoidal signal. The output terminal of the power amplifier 2 is connected to the input terminal of the ultrasonic transducer 3. The ultrasonic transducer 3 is used to output ultrasonic waves based on the amplified sinusoidal signal. The frequency value of the ultrasonic waves is consistent with the frequency value of the sinusoidal signal.

[0062] Specifically, it also includes: a liquid crystal display 7; the liquid crystal display 7 is connected to the microscope 5, and the liquid crystal display 7 is used to display image information of the acoustic metamaterial 4 collected by the eyepiece.

[0063] Specifically, the device also includes a water tank 6 filled with water.

[0064] The ultrasonic transducer 3, the acoustic metamaterial 4, and the microscope 5 are disposed within the water tank 6; and the water in the water tank 6 overflows the ultrasonic transducer 3 and the acoustic metamaterial 4. The water is used to increase the propagation speed of the ultrasonic waves.

[0065] Because of the large difference in sound velocity between the material matrix 9 and the microspheres 8 (more than 10 times), a unipolar resonance will be generated at a specific frequency under the action of ultrasound, resulting in a negative equivalent elastic modulus parameter; while the high-density stacking of microspheres will generate a dipole resonance, resulting in a negative equivalent mass density parameter.

[0066] Specifically, the frequency range of the ultrasonic wave is 0-10MHz.

[0067] The ultrasonic transducer 3 is a water immersion ultrasonic transducer; the eyepiece is a water immersion eyepiece; the microscope 5 is an optical microscope; and the water is deaerated distilled water.

[0068] Figure 4 This is a schematic diagram of the ultrasonic dynamic observation method for acoustic metamaterials according to the present invention.

[0069] like Figure 4 As shown, Embodiment 2 of the present invention provides an ultrasonic dynamic observation method for acoustic metamaterials, comprising:

[0070] Step 100: Obtain image information of the acoustic metamaterial 4 when ultrasound is applied to it.

[0071] Step 200: Record the frequency value of the ultrasound corresponding to the image information when resonance occurs.

[0072] Specifically, it also includes: measuring the transmission coefficient and reflection coefficient of the acoustic metamaterial 4 at the target frequency value; the target frequency value is the frequency value of the ultrasonic wave corresponding to the image information when resonance occurs.

[0073] Based on the transmission coefficient and the reflection coefficient, the negative equivalent elastic modulus parameter and the negative equivalent mass density parameter of the acoustic metamaterial 4 are calculated.

[0074] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0075] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for ultrasonic dynamic observation of acoustic metamaterials, characterized in that, include: The acoustic metamaterial comprises: a material substrate and microspheres; The microspheres are disposed within the material substrate; Acquire image information of the acoustic metamaterial when ultrasound is applied to it; Record the frequency value of the ultrasound wave corresponding to the image information when resonance occurs; The resonance is a monopole resonance, a dipole resonance, or a combination of monopole and dipole resonance. The manifestation of the unipolar resonance is that the microspheres expand or contract. The dipole resonance is manifested as the microspheres moving in all directions. The simultaneous existence of the unipolar resonance and the dipole resonance manifests as follows: the microsphere both expands or contracts and moves in all directions; The transmission coefficient and reflection coefficient of the acoustic metamaterial at the target frequency value are measured; the target frequency value is the frequency value of the ultrasonic wave corresponding to the image information when resonance occurs. Based on the transmission coefficient and the reflection coefficient, calculate the negative equivalent elastic modulus parameter and the negative equivalent mass density parameter of the acoustic metamaterial.

2. An ultrasonic dynamic observation device for acoustic metamaterials, characterized in that, include: Ultrasonic transducers, microscopes, and processors; The ultrasonic transducer is used to output ultrasonic waves; the output port of the ultrasonic transducer is on the same horizontal plane as the acoustic metamaterial, and the acoustic metamaterial is disposed on the microscope. The acoustic metamaterial comprises: a material substrate and microspheres; The microspheres are disposed within the material substrate; The microscope is used to acquire image information of the acoustic metamaterial when the ultrasonic wave acts on it. The processor is used for: Acquire image information of the acoustic metamaterial when ultrasound is applied to it; Record the frequency value of the ultrasound wave corresponding to the image information when resonance occurs; The resonance is a monopole resonance, a dipole resonance, or a combination of monopole and dipole resonance. The manifestation of the unipolar resonance is that the microspheres expand or contract. The dipole resonance is manifested as the microspheres moving in all directions. The simultaneous existence of the unipolar resonance and the dipole resonance manifests as follows: the microsphere both expands or contracts and moves in all directions; The transmission coefficient and reflection coefficient of the acoustic metamaterial at the target frequency value are measured; the target frequency value is the frequency value of the ultrasonic wave corresponding to the image information when resonance occurs. Based on the transmission coefficient and the reflection coefficient, calculate the negative equivalent elastic modulus parameter and the negative equivalent mass density parameter of the acoustic metamaterial.

3. The ultrasonic dynamic observation device for acoustic metamaterials according to claim 2, characterized in that, The microscope includes: an eyepiece and a stage; The eyepiece is used to acquire image information of the acoustic metamaterial when the ultrasonic wave acts on it; the stage is used to place the acoustic metamaterial.

4. The ultrasonic dynamic observation device for acoustic metamaterials according to claim 2, characterized in that, Also includes: Signal generator and power amplifier; The signal generator is used to generate a sinusoidal signal. The input terminal of the power amplifier is connected to the signal generator, and the power amplifier is used to amplify the sinusoidal signal. The output terminal of the power amplifier is connected to the input terminal of the ultrasonic transducer. The ultrasonic transducer is used to output ultrasonic waves based on the amplified sinusoidal signal.

5. The ultrasonic dynamic observation device for acoustic metamaterials according to claim 3, characterized in that, It also includes: a liquid crystal display; the liquid crystal display is connected to the microscope, and the liquid crystal display is used to display image information of the acoustic metamaterial acquired by the eyepiece.

6. The ultrasonic dynamic observation device for acoustic metamaterials according to claim 2, characterized in that, Also includes: A water tank; The ultrasonic transducer, the acoustic metamaterial, and the microscope are disposed in the water tank, and the water in the water tank overflows the ultrasonic transducer and the acoustic metamaterial.

7. The ultrasonic dynamic observation device for acoustic metamaterials according to claim 2, characterized in that, The frequency range of the ultrasound is 0-10MHz.

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