A thermoelectric dual-field phantom system and design method

Abstract

The present invention relates to a thermoelectric dual-field phantom system and a design method. The phantom system includes a phantom device and a phantom body for physical field control, which are simultaneously set in a background environment. The phantom device is a functional device made of metamaterials. The phantom device includes a central core wrapped from the inside to the outside and two shells. The phantom body is a structure with completely the same scattering characteristics as the phantom device. The phantom body is a structure with completely the same external geometric shape and size as the outermost shell of the phantom device. Compared with the prior art, the presence of the phantom body of the present invention not only realizes the phantom of the thermoelectric signal of the phantom device, but also realizes the phantom of the special physical field control function.

Description

Technical Field

[0001] The present invention relates to the technical field of metamaterials, and in particular to a thermoelectric dual-field phantom system and a design method thereof. Background Art

[0002] In recent years, metamaterials have attracted extensive attention from researchers due to their unique physical field control functions. By designing special structural forms, they can achieve stealth functions, aggregation functions, phantom functions, detection functions, etc. This provides a theoretical basis for the realization of novel structural functional materials.

[0003] These devices designed based on metamaterials can be recognized by specific detection tools due to their own scattering characteristics while realizing the physical field control function. Therefore, it is very important to confuse and disrupt these detection tools to protect the devices. Most of the current phantom research is limited to a single physical field, and there is a lack of research on the function of phantom devices, that is, to realize the phantom of the device's scattering signal while also realizing the phantom of a special physical field control function. Summary of the invention

[0004] The purpose of the present invention is to provide a thermoelectric dual-field phantom system and a design method in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A thermoelectric dual-field phantom system comprises a phantom device and a phantom body for physical field control which are simultaneously arranged in a background environment, wherein the phantom device is a functional device made of metamaterials, the phantom device comprises a central core wrapped from the inside to the outside and two shells, the phantom body is a structure having completely the same scattering characteristics as the phantom device, and the phantom body is a structure having completely the same external geometric shape and size as the outermost shell of the phantom device.

[0007] Preferably, the cross section of the phantom device is in the shape of a three-layer confocal ellipse, and correspondingly, the cross section of the phantom body is in the shape of an ellipse that is consistent with the size of the outermost shell of the phantom device.

[0008] Preferably, the phantom device has a gathering function or a stealth function under thermal and electric fields.

[0009] Preferably, the aggregation function under the thermal field is that the temperature gradient of the central core is greater than the temperature gradient in the background environment, and the aggregation function under the electric field is that the potential gradient of the central core is greater than the potential gradient in the background environment.

[0010] Preferably, the stealth function under the thermal field is that the temperature distribution of the central core is a constant value and the temperature gradient approaches zero, and the stealth function under the electric field is that the potential distribution of the central core is a constant value and the potential gradient approaches zero.

[0011] Preferably, the central core and the two shells are both isotropic materials, the thermal conductivities are κ1, κ2, κ3, and the electrical conductivities are σ1, σ2, σ3, respectively. The thermal conductivity and electrical conductivity of the phantom body are κ4 and σ4, respectively.

[0012] Preferably, the major axis radius and minor axis radius of the cross section of the central core correspond to lc1 and lc2, the major axis radius and minor axis radius of the cross section of the inner shell correspond to ls1 and ls2, and the major axis radius and minor axis radius of the cross section of the outermost shell and the phantom body correspond to le1 and le2.

[0013] Preferably, when the phantom device needs to realize a gathering function, the central core is made of insulating material.

[0014] Preferably, when the phantom device needs to achieve a stealth function, the first shell close to the central core is set to an insulating material.

[0015] A design method for a thermoelectric dual-field phantom system, the method comprising:

[0016] Determine the material parameters of the phantom body, the central core and the two shells of the phantom device;

[0017] determining geometric parameters of the central core of the phantom device;

[0018] By using the neutral inclusion principle, the geometric parameters of the two shells in the phantom device are determined based on the material parameters of the phantom body, the central core and the two shells, as well as the geometric parameters of the central core;

[0019] The geometric parameters of the outermost shell are determined as the geometric parameters of the phantom body.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) The phantom device and the phantom body of the present invention are applicable to both thermal fields and electric fields. When the phantom device and the phantom body are placed in a background thermoelectric dual-field environment at the same time, the detector cannot identify the phantom device and the phantom body through the disturbance of the external thermal field and the electric field, thereby achieving the effect of phantom protection.

[0022] (2) In the present invention, since the phantom device itself has a special physical field control function, the existence of the phantom body not only realizes the phantom of the thermoelectric signal of the phantom device, but also realizes the phantom of the special physical field control function. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is the geometric model diagram of the thermoelectric double-field phantom device;

[0024] Figure 2 This is the geometric model diagram of the thermoelectric double-field phantom body;

[0025] Figure 3 This is a thermal and electric field distribution diagram of the thermoelectric dual-field phantom device of Example 1;

[0026] Figure 4 This is the thermal and electric field distribution diagram of the thermoelectric double-field phantom body of Example 1;

[0027] Figure 5 This is a thermal and electric field distribution diagram of the thermoelectric dual-field phantom device of Example 2;

[0028] Figure 6 This is the thermal and electric field distribution diagram of the thermoelectric double-field phantom body of Example 2. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the following embodiments are merely illustrative in nature, and the present invention is not intended to limit its applicable objects or uses, and the present invention is not limited to the following embodiments.

[0030] Example

[0031] The present invention provides a thermoelectric dual-field phantom system, including a phantom device and a phantom body for physical field control, which are simultaneously arranged in a background environment. The phantom device is a functional device made of metamaterials, and includes a central core wrapped from the inside to the outside and two shells. The phantom body is a structure with completely the same scattering characteristics as the phantom device, which is designed to protect the phantom device and confuse the detector. The phantom body is a structure with completely the same external geometric shape and size as the outermost shell of the phantom device. When the phantom device and the phantom body exist in the background environment at the same time, the external detector cannot identify the phantom device through the disturbance of the physical field, thereby achieving the effect of the phantom.

[0032] The cross section of the phantom device is an ellipse with three confocal layers. Correspondingly, the cross section of the phantom body is an ellipse with the same size as the outermost shell of the phantom device.

[0033] The phantom device has a gathering function or a stealth function under thermal and electric fields.

[0034] The aggregation function under the thermal field is that the temperature gradient of the central core is greater than the temperature gradient in the background environment, and the aggregation function under the electric field is that the potential gradient of the central core is greater than the potential gradient in the background environment.

[0035] The stealth function under the thermal field is that the temperature distribution of the central core is a constant and the temperature gradient approaches zero, and the stealth function under the electric field is that the electric potential distribution of the central core is a constant and the electric potential gradient approaches zero.

[0036] The central core and the two shells are all isotropic materials, and the thermal conductivities are κ1, κ2, κ3, and the electrical conductivities are σ1, σ2, σ3, respectively. The thermal conductivity and electrical conductivity of the phantom body are κ4 and σ4, respectively. In this embodiment, κ1≠κ2≠κ3≠κ4, and σ1≠σ2≠σ3≠σ4.

[0037] When the phantom device needs to realize the focusing function, the central core adopts insulating material.

[0038] When the phantom device needs to achieve a stealth function, the first shell close to the central core is set to an insulating material.

[0039] The design method of the above-mentioned thermoelectric dual-field phantom system comprises:

[0040] Determine the material parameters of the phantom body, the central core and the two shells of the phantom device;

[0041] determining geometric parameters of the central core of the phantom device;

[0042] By using the neutral inclusion principle, the geometric parameters of the two shells in the phantom device are determined based on the material parameters of the phantom body, the central core and the two shells, as well as the geometric parameters of the central core;

[0043] The geometric parameters of the outermost shell are determined as the geometric parameters of the phantom body.

[0044] In summary, the present invention designs a thermoelectric dual-field phantom device and a phantom body structure based on the principle of neutral inclusion. For the thermoelectric dual-field phantom device, appropriate material parameters can be selected according to the special physical field control function that the device needs to realize (the inner confocal elliptical shell needs to be set as an insulating material to realize the stealth function; the central elliptical core needs to be set as an insulating material to realize the gathering function). After the geometric parameters of the central elliptical core are known, the geometric dimensions of the confocal elliptical shell can be further solved.

[0045] Figure 1 The geometric model diagram of the thermoelectric dual-field phantom device is shown in Figure 1. The geometric parameters lc1 and lc2 of the central elliptical core are lc1 = 12 cm and lc2 = 8 cm respectively. Figure 2The geometric model diagram of the thermoelectric dual-field phantom body. The materials of the phantom body and the background matrix are 316 stainless steel [16.3 (W / (m﹒K)), 1.43E6 (S / m)] and 6061 aluminum alloy [155 (W / (m﹒K)), 2.49E7 (S / m)] respectively. The left and right boundary conditions of the background matrix are set to 293.15K (5V) and 273.15K (0V), and the upper and lower boundaries are thermoelectric insulation boundaries. Next, two different thermoelectric dual-field phantom devices and phantom bodies will be analyzed by examples.

[0046] Example 1

[0047] In order to realize the function of focusing the thermal and electric fields, the materials of the central elliptical core and the two layers of confocal elliptical shells from the inside to the outside are selected as PDMS [0.15 (W / (m﹒K)), 0 (S / m)], magnesium alloy [72.7 (W / (m﹒K)), 6.99E6 (S / m)], 436 stainless steel [30 (W / (m﹒K)), 1.43E6 (S / m)]. After knowing the geometric parameters of the central elliptical core and the material parameters of the phantom body, the geometric parameters of the confocal elliptical shells from the inside to the outside can be obtained as ls1 = 13.3722cm, ls2 = 9.9406cm; le1 = 13.9135cm, le2 = 10.6576cm. The finite element simulation results are shown in Figure 3 and Figure 4 , Figure 3 and Figure 4 (a) is the thermal field distribution, and (b) is the electric field distribution. Analysis shows that the thermal and electric field disturbances of the background environment generated by the phantom device and the phantom body in Example 1 are exactly the same, that is, the phantom device cannot be identified by the physical field distribution in the background environment, thereby disguising the phantom device (thermoelectric signal and thermoelectric gathering function) as a phantom body.

[0048] Example 2

[0049] In order to achieve the stealth function of thermal and electric fields, the materials of the central elliptical core and the two layers of confocal elliptical shells from the inside to the outside are copper [386.4 (W / (m﹒K)), 5.98E7 (S / m)], PDMS [0.15 (W / (m﹒K)), 0 (S / m)], and tungsten [173 (W / (m﹒K)), 1.89E7 (S / m)]. After knowing the geometric parameters of the central elliptical core and the material parameters of the phantom body, the geometric parameters of the confocal elliptical shells from the inside to the outside can be calculated as ls1 = 12.5324cm, ls2 = 8.7785cm; le1 = 13.0354cm, le2 = 9.4827cm. The finite element simulation results are shown in Figure 5 and Figure 6 , Figure 5 and Figure 6(a) is the thermal field distribution, and (b) is the electric field distribution. Analysis shows that the thermal and electric field disturbances of the background environment generated by the phantom device and the phantom body in Example 2 are also exactly the same, that is, the phantom device cannot be identified by the physical field distribution in the background environment, thereby disguising the phantom device (thermoelectric signal and thermoelectric stealth function) as a phantom body.

[0050] The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments can also be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the technical concept of the present invention.

Claims

1. A thermoelectric dual-field phantom system, characterized in that: It includes a phantom device and a phantom body for physical field control which are simultaneously arranged in a background environment. The phantom device is a functional device made of metamaterials. The phantom device includes a central core wrapped from the inside to the outside and two shells. The phantom body is a structure with completely the same scattering characteristics as the phantom device. The phantom body is a structure with completely the same external geometric shape and size as the outermost shell of the phantom device.

2. A thermoelectric dual-field phantom system according to claim 1, characterized in that: The cross section of the phantom device is an ellipse with three confocal layers. Correspondingly, the cross section of the phantom body is an ellipse with the same size as the outermost shell of the phantom device.

3. A thermoelectric dual-field phantom system according to claim 1, characterized in that: The phantom device has a gathering function or a stealth function under a thermal field and an electric field.

4. A thermoelectric dual-field phantom system according to claim 3, characterized in that: The aggregation function under the thermal field is that the temperature gradient of the central core is greater than the temperature gradient in the background environment, and the aggregation function under the electric field is that the potential gradient of the central core is greater than the potential gradient in the background environment.

5. A thermoelectric dual-field phantom system according to claim 3, characterized in that: The stealth function under the thermal field is that the temperature distribution of the central core is a constant value and the temperature gradient approaches zero, and the stealth function under the electric field is that the potential distribution of the central core is a constant value and the potential gradient approaches zero.

6. A thermoelectric dual-field phantom system according to claim 1, characterized in that: The central core and the two shells are all isotropic materials, and the thermal conductivities are κ1, κ2, κ3, and the electrical conductivities are σ1, σ2, σ3, respectively. The thermal conductivity and electrical conductivity of the phantom body are κ4 and σ4, respectively.

7. A thermoelectric dual-field phantom system according to claim 2, characterized in that: The major axis radius and minor axis radius of the cross section of the central core correspond to lc1 and lc2, the major axis radius and minor axis radius of the cross section of the inner shell correspond to ls1 and ls2, and the major axis radius and minor axis radius of the cross section of the outermost shell and the phantom body correspond to le1 and le2.

8. The thermoelectric dual-field phantom system according to claim 3, characterized in that: When the phantom device needs to realize the gathering function, the central core is made of insulating material.

9. The thermoelectric dual-field phantom system according to claim 3, characterized in that: When the phantom device needs to achieve a stealth function, the first shell close to the central core is set to an insulating material.

10. A design method for a thermoelectric dual-field phantom system according to any one of claims 1 to 9, characterized in that: The method includes: Determine the material parameters of the phantom body, the central core and the two shells of the phantom device; determining geometric parameters of the central core of the phantom device; By using the neutral inclusion principle, the geometric parameters of the two shells in the phantom device are determined based on the material parameters of the phantom body, the central core and the two shells, as well as the geometric parameters of the central core; The geometric parameters of the outermost shell are determined as the geometric parameters of the phantom body.

Images