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Plasma parameter measurement method based on plasma wind tunnel

A plasma and parameter measurement technology, which is used in the testing of plasma, measuring devices, machines/structural components, etc. It can solve problems such as flow field disturbance and measurement error, and achieve the effect of improving accuracy and reducing disturbance error.

Inactive Publication Date: 2020-12-25
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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AI Technical Summary

Problems solved by technology

Since the probe needs to intervene in the flow field for measurement, the flow field is disturbed to varying degrees, which brings errors to the measurement

Method used

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  • Plasma parameter measurement method based on plasma wind tunnel
  • Plasma parameter measurement method based on plasma wind tunnel
  • Plasma parameter measurement method based on plasma wind tunnel

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, not to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

[0030] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0031] The embodiments of the present invention aim at the parameter measurement of the plasma wind tunnel, and propose a parameter measurement method for low-pressure plasma based on microwave interference technology and spectral velocity measurement. figure 1 The principle of plasma parameter measurement...

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Abstract

The invention provides a plasma parameter measurement method based on a plasma wind tunnel. The method comprises the steps of firstly adjusting a transmitting antenna and a receiving antenna to be inthe same phase through a vector network analyzer before laminar plasmas are inputted into the plasma wind tunnel; forming a plasma beam in a wind tunnel between the transmitting antenna and the receiving antenna after plasmas are input; measuring the diameter of the plasma beam and the phase difference between the receiving antenna and the transmitting antenna, and calculating the plasma electrondensity according to the phase difference and the diameter of the plasma beam; and measuring the offset of characteristic spectral lines of the plasma particles through a spectrograph, and calculatingthe beam velocity of the plasmas according to the offset. The measurement error of the electron density and the beam speed of the plasmas measured by the method is less than 0.01mm, the accompanyingresolution is less than 0.5 degree, the comprehensive error is less than 0.16%, the plasma parameters are accurately measured on the premise of not interfering with the plasma beam, and the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the field of plasma wind tunnel testing, and in particular relates to a method for measuring plasma parameters of a plasma wind tunnel. Background technique [0002] The airflow in the plasma wind tunnel is formed by a pure, long-term stable high-enthalpy plasma jet, which can be used to study the electromagnetic properties of the plasma sheath of a hypersonic vehicle. In the plasma wind tunnel experimental device, the gas medium enters the quartz tube through the spiral air inlet device, and the plasma is generated by heating or radiation, and the plasma enters the vacuum test section through the nozzle to form a plasma jet. To realize a plasma wind tunnel, the key is to obtain a long-term stable plasma jet. In order to ensure the stability of the plasma jet, real-time measurements of the electron density and beam velocity of the plasma jet are required. [0003] In the prior art, probes are generally used to measure the ele...

Claims

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Application Information

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IPC IPC(8): H05H1/00G01M9/06
CPCG01M9/06H05H1/0087
Inventor 白冰丁亮韩潇张磊赵华李涛彭毓川顾志飞李高吴达
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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