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Plasma material design method

A technology of plasma and design method, applied in computing, special data processing applications, instruments, etc., to achieve good application effect, reduce electromagnetic scattering, and low preparation cost

Active Publication Date: 2018-01-30
SHANGHAI RADIO EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned literature is still focused on analyzing the transmission and reflection characteristics of electromagnetic waves inside the plasma, and has not yet covered how to improve and design broadband high-absorption plasma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0083] (1) Acquisition of plasma electromagnetic parameters

[0084] A cylindrical plasma is used for simulation calculation. The lamp tube type is T5, and the corresponding diameter is about 15.6mm. In the experiment, a fluorescent tube is used to realize the generation of plasma. The electronic ballast is self-configured, the power matches the lamp tube, and the rated power is 30W. Experimentally measured the spectral data at seven different points of the circular lamp tube, and calculated the electron density value of each point. The electron density value of the lamp tube is mainly at 1×10 12 -1×10 13 m -3 within range.

[0085] (2) Calculation of plasma transmission and reflection characteristics

[0086] Considering that the actual arrangement of cylindrical plasmas is adjacent to each other, the space is filled with plasma and surface air layer during the test. For the convenience of calculation, the method of equivalent distribution calculation is used to complete...

Embodiment example 2

[0092] (1) Relationship between plasma electron density and electromagnetic parameters

[0093] Same as the implementation case 1, the cylinder plasma is still used for simulation calculation, the lamp tube model is T5, and the corresponding diameter is about 15.6mm, and the relationship between plasma electron density and electromagnetic parameters is obtained.

[0094] (2) Calculation of plasma transmission and reflection characteristics

[0095] Considering that the actual arrangement of cylindrical plasma has a certain duty cycle, the space is filled with plasma and surface air layer during the test. For the convenience of calculation, the method of equivalent distribution calculation is used to complete the calculation, which will include the mixing of cylindrical plasma and air. The material equivalent is a homogeneously distributed mixture of materials. The variation law of the dielectric constant of the mixture material can be explained by the following Maxwell-Garnet...

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Abstract

A plasma material design method includes: adopting a fluorescent tube as a plasma generator, simulating a cylindrical plasma material, acquiring electromagnetic parameters of the cylindrical plasma material, adopting the cylindrical plasma material to construct a single plasma material layer, calculating an effective dielectric constant according to transmission and reflection characteristics of the cylindrical plasma material so as to acquire complex permeability and complex dielectric permittivity of an equivalent structure of the single plasma material layer, and adopting a genetic algorithm for optimization design of single plasma material layers different in electron density to obtain a final wideband high-absorptivity plasma multilayer distribution structure. The plasma material design method has advantages that electromagnetic wave absorptivity of plasma materials is improved while reflection is reduced, electromagnetic scattering of a target and electromagnetic coupling betweena background and the target can be reduced, influences of the background on target testing are reduced, and low preparation cost and great application effects are realized.

Description

technical field [0001] The invention relates to the design field of wave-absorbing and shielding materials with complex structures, in particular to a plasma material design method. Background technique [0002] With the development of electromagnetic wave technology, the electromagnetic scattering characteristic test of the target is very important for the survivability and positioning judgment of the target. At present, the radar cross section (RCS) of the target is an important indicator reflecting its performance characteristics. With the increasing demand for testing low-scattering targets or stealth targets, indoor simulation testing has been paid more and more attention to the evaluation of electromagnetic scattering characteristics of targets. For example, spaceships, space shuttles, and hypersonic vehicles are a special type of aircraft. When they re-enter the atmosphere and return to the earth, they fly at extremely high speeds, which can reach ten to dozens of tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 许勇刚梁子长陈方园何鸿飞郭良帅
Owner SHANGHAI RADIO EQUIP RES INST
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