Testing system and method for ultrahigh sound velocity two-dimensional plasma sheath

A plasma and ultra-high speed of sound technology, applied in the field of plasma sheath, can solve the problems of not many demonstration and verification systems, few experimental test verifications, etc., and achieve the effect of high test efficiency and low test cost

Active Publication Date: 2018-05-15
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

[0010] In short, previous studies on the interaction between plasma and electromagnetic waves mainly focused on simulation. Although there is a certain basis for the research on the characteristics of plasma materi

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  • Testing system and method for ultrahigh sound velocity two-dimensional plasma sheath
  • Testing system and method for ultrahigh sound velocity two-dimensional plasma sheath
  • Testing system and method for ultrahigh sound velocity two-dimensional plasma sheath

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[0034] The invention provides a hypersonic two-dimensional plasma sheath testing system, which includes a vector network analyzer, a turntable system, an antenna, a plasma generator and a control system, and a plasma density diagnosis system.

[0035] The simulation results of the supersonic plasma sheath are as follows figure 1 Shown. The electron density of the plasma sheath has a more complicated distribution form, the highest in the stagnation area in the front, and the density decreases with the axial and radial directions of the fuselage. The present invention uses a blunt cone plasma generator to simulate the complex distribution of the ultra-high sound velocity plasma sheath. The plasma generator is in a closed cylindrical glass cavity (such as a fluorescent tube) and uses low-pressure mercury vapor discharge to generate a specific concentration plasma. Compared with other methods of generating plasma, the method of generating plasma by low-pressure mercury vapor dischar...

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Abstract

The invention provides a testing system and method for an ultrahigh sound velocity two-dimensional plasma sheath, and is used for measuring electromagnetic scattering parameters of the ultrahigh soundvelocity plasma sheath. The system comprises a plasma generator, an antenna, a vector network analyzer, a programmable power system and a plasma density diagnosis system. The method comprises the following steps: arranging the plasma generator of the ultrahigh sound velocity plasma sheath on a rotary table; arranging the 1-8 GHz antenna on one side of the generator; calibrating the antenna through the vector network analyzer; recording and processing emitted and received signals of the antenna through a port, so as to obtain scattering parameters; diagnosing plasma produced in the plasma generator through a spectrograph; and controlling plasma related important parameters through a computer. The system fills the gap of the measurement of parameters of the ultrahigh sound velocity two-dimensional plasma sheath, provides an experimental evidence for the research of plasma sheath electromagnetic simulation, and lays a foundation for exploration and solving the problem of communication blackout of aircrafts.

Description

technical field [0001] The invention relates to microwave testing technology, in particular to a super-high-speed two-dimensional plasma sheath, which is mainly used for simulation testing of the super-high-speed aircraft plasma sheath, and provides a basis for solving the "black barrier" problem. Background technique [0002] Plasma is the fourth state that exists in addition to the liquid, solid, and gaseous states of matter. When the neutral gas is reacted in some physical or chemical way by the high energy of nature, these neutral gases become a mixture composed of many electrons, positively charged particles and neutral atoms. In recent years, whether it is manned spacecraft returning to the earth to enter the atmosphere, hypersonic weapons re-entering orbit, or low-scattering aircraft actively using plasma materials for wave absorption, etc., these situations are related to the propagation, attenuation, and reflection characteristics of electromagnetic waves in plasma....

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Application Information

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IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 贾洁姝梁子长何鸿飞许勇刚郭良帅
Owner SHANGHAI RADIO EQUIP RES INST
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