Detection method and detection device for plasma density distribution
A plasma and density distribution technology, applied in the field of detection, can solve problems such as deflection, black barrier, delay, etc., and achieve the effects of convenient operation, convenient implementation and simple detection method.
Active Publication Date: 2021-08-31
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology
[0002] At present, when the electromagnetic wave encounters the plasma sheath in the propagation process, it is attenuated by being absorbed by it, and effects such as deflection, time delay, and phase shift occur. The measurement, control, communication and guidance of high-speed aircraft bring great difficulties
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[0054] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.
[0055] The following discussion provides several embodiments of the application. Although each embodiment represents a single combination of the application, different embodiments of the application can be replaced or combined in combination, so the application can also be considered to include all possible combinations of the same and / ...
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The invention provides a detection method and device for plasma density distribution, and the method comprises the steps: enabling an original laser to form a first sub-laser and a second sub-laser through the beam splitting of a first beam splitter, enabling the second sub-laser to pass through a plasma region, and enabling the second sub-laser to be combined with the first sub-laser through a second beam splitter to generate a combined laser; generating a detection interference fringe image according to the synthesized laser; generating an offset of the detection interference fringe image according to the detection interference fringe image; calculating the density of the plasma according to the offset, repeatedly measuring the two-dimensional density distribution of the plasma in multiple directions, and calculating and constructing a three-dimensional space distribution image of the plasma density. According to the detection method provided by the invention, due to the influence of the plasma on the second sub-laser, the shape of the interference fringes can be deformed, the deformation offset of the multiple interference fringes can be obtained through calculation, and then the spatial distribution of the plasma density can be obtained through the multiple offset.
Description
technical field [0001] The present application relates to the technical field of detection, in particular to a detection method and detection device for plasma density distribution. Background technique [0002] At present, when the electromagnetic wave encounters the plasma sheath in the propagation process, it is attenuated by being absorbed by it, and effects such as deflection, time delay, and phase shift occur. The measurement, control, communication and guidance of high-speed aircraft bring great difficulties. The fundamental reason why plasma can be invisible to radar waves is that the electric field of electromagnetic waves in the microwave band accelerates charged particles in the plasma, and the charged particles collide with neutral particles, thereby transferring the energy absorbed from microwave electromagnetic waves. Since the frequency of the terahertz wave is much higher than the oscillation frequency of the plasma, the charged particles in the plasma have ...
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Login to View More IPC IPC(8): H05H1/00
CPCH05H1/0025Y02E30/10
Inventor 孙金海蔡禾朱先立张旭涛刘永强
Owner BEIJING INST OF ENVIRONMENTAL FEATURES