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Invisible cloak placed in porous medium background and application

A technology of porous media and cloaks, applied in the field of invisibility, can solve the problems of difficult experiments and invisibility of invisibility cloaks, and achieve the effect of simple design and large parameter span

Pending Publication Date: 2022-07-08
THE CHINESE UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the design of the invisibility cloak, the shell should be as thin as possible. The thinner the invisibility cloak is, the harder it is to be detected by near-field observers. The cost of becoming extremely thin is that the parameter distribution of the material is more extreme. In many physical It is difficult to find materials with such extreme parameters in the field, so it is even more difficult to realize experimentally

Method used

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  • Invisible cloak placed in porous medium background and application
  • Invisible cloak placed in porous medium background and application
  • Invisible cloak placed in porous medium background and application

Examples

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Embodiment 1

[0071] This embodiment provides a two-dimensional invisibility cloak and a microfluidic device placed in a porous medium background. The schematic diagram of the cross-section of the two-dimensional invisibility cloak placed in the porous medium background is as follows: figure 1 and figure 2 shown, where figure 2 forfigure 1 A schematic diagram of the enlarged structure of the cross section inside the black box;

[0072] The two-dimensional invisibility cloak includes a stealth zone 1 (material is polydimethylsiloxane, a cylinder with a height of 10 μm and a diameter of 40 mm, namely R 1 20mm), the invisibility cloak shell layer 2 (unstructured permeable thin layer, that is, the air thin layer, k s is 3×10^(-9)m^2, and its thickness is 60μm, namely R 2 is 20.06mm, ) and the cylinders arrayed on the periphery of the invisibility cloak shell, the diameter of the cylinder is 800μm, the minimum distance between any two adjacent cylinders is 10μm, the arrays are arranged in t...

Embodiment 2

[0091] This embodiment provides a three-dimensional invisibility cloak placed on a porous medium background. The three-dimensional structure diagram of the cloak is as follows: Figure 14 As shown, it includes a porous medium background 3, an invisibility zone 1 and an invisibility cloak shell 2 covering the invisibility zone;

[0092] The stealth zone is a sphere with a diameter of 20 cm, namely R 1 is 10cm;

[0093] The shell layer of the invisibility cloak is an air thin layer with a thickness of 0.03 cm, namely R 2 is 10.03cm, k s is 3×10^(-9)m^2;

[0094] The porous media background is composed of isotropic arrangement of homogeneous spherical particles, k b is 1.8×10^(-11)m^2.

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Abstract

The invention provides an invisible cloak placed in a porous medium background and application. The invisible cloak comprises an invisible area and an invisible cloak shell layer covering the invisible area. The permeability of the invisible cloak shell layer material meets any one of the following formula I or formula II. By designing the permeability of the invisible cloak shell layer material and the hydraulic permeability of the porous medium background, the invisible cloak with the thin invisible cloak shell layer is prepared.

Description

technical field [0001] The invention belongs to the technical field of stealth, and in particular relates to a stealth cloak placed on a porous medium background and its application. Background technique [0002] Invisibility of objects has always been the tireless pursuit of human beings. Since the advent of transformation optics theory in 2006, the dream of realizing invisibility cloaks in different physical fields has become no longer far away. If the governing equation of a transport field remains unchanged under the coordinate transformation, then its transport path can be modulated by our carefully designed metamaterial with spatially anisotropic parameters, bypassing the cloaked object, thereby avoiding The appearance of scattering achieves the stealth function. According to this theory, researchers can design invisibility cloaks that can prevent the interior space from being probed by the outside world, making interior objects invisible under specific conditions, su...

Claims

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Application Information

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IPC IPC(8): G06F30/28A41D3/08G06F113/08G06F119/14
CPCG06F30/28A41D3/08G06F2113/08G06F2119/14
Inventor 陈梦谣沈翔瀛徐磊
Owner THE CHINESE UNIVERSITY OF HONG KONG
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