Time-varying plasma diagnosis method and diagnosis system based on autoencoder

Abstract

The invention discloses a time-varying plasma diagnosis method and system based on an automatic encoder, and the method comprises the steps: a transmitting end generates a single-frequency carrier signal, and the single-frequency carrier signal reaches a receiving end through a reference branch and a test branch provided with time-varying plasma; sampling is performed on the test branch and the reference branch at the receiving end to obtain a sampling signal sequence of the test branch and a sampling signal sequence of the reference branch respectively, and complex fading h caused by time-varying plasmas is calculated; the complex fading h is converted into real part and virtual part signals x, and filtering is carried out by the automatic encoder to obtain a signal y; and the time-varying electron density and the collision frequency are determined according to the signal y. According to the method, the electron density and the collision frequency of the time-varying plasma are diagnosed through the automatic encoder, the result is accurate, the efficiency is high, the robustness to noise is high, and the problems existing in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of plasma diagnosis, and relates to a time-varying plasma diagnosis method and a diagnosis system based on an automatic encoder. Background technique [0002] Under the action of high temperature, the neutral gas is ionized and becomes a plasma composed of positively and negatively charged ions and electrons as well as some neutral particles. Plasma is the fourth form of matter. With the development of plasma science, plasma has been widely used in various fields due to its unique properties. In order to characterize the microscopic properties of plasma, it is necessary to use plasma diagnostic technology to measure plasma parameters. The more commonly used diagnostic methods at present have Langmuir probe method, microwave method and spectroscopic method; The needle penetrates deep into the plasma, so the material of the probe will affect the diagnosis result. At the same time, when the temperature is too...

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Problems solved by technology

The more commonly used diagnostic methods at present have Langmuir probe method, microwave method and spectroscopic method; The needle goes deep into the plasma, so the material of the probe will affect the diagnostic results, and when the temperature is too high, the probe will deform and cause a large error in the measurement of the volt-ampere characteristic curve

However, this method cannot adapt to the rapidly time-varying plasma, and at the same time, due to the noise in the received signal, there is a large error in the solution result

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