Particle speed distribution measurement system of ion thruster plume area

Abstract

The invention discloses a particle speed distribution measurement system of an ion thruster plume area. The system comprises an optical signal generation and transmission unit, an optical signal detection unit and a data acquisition and control unit. The optical signal generation and transmission unit is arranged outside a vacuum chamber, and used for generating laser and splitting the laser into four beams through a beam splitter, wherein three beams enter a wavelength meter, a power meter and an F-P interferometer respectively and the other beam enters the vacuum chamber through a chopper and a fiber and used for motivating to-be-measured particles. An axial or radial laser incidence device in the optical signal detection unit receives laser beams entering the vacuum chamber, and is used for carrying out focusing calibration on the laser beams and motivating particles of a detection area. A fluorescence detection device is used for acquiring fluorescence emitted through motivation of the particles at a detection point, and sending fluorescent signals to the data acquisition and control unit which processes the fluorescent signals.

Description

technical field [0001] The invention provides an ion velocity distribution measuring device in a plume area of ​​an ion thruster, which belongs to the technical field of particle measurement. Background technique [0002] Most of the mainstream electric propulsion technologies in the world are based on the physical process of plasma generation and acceleration. The plasma research of the electric propulsion system mainly includes the research on the generation, collision, transport and other processes of plasma in the discharge chamber of the thruster and the thruster plume. Fluid plasma research. The motion characteristics of the plasma in the thruster plume area are of key significance for the optimal design of the thruster, the improvement of efficiency, and the establishment of numerical models. Obtaining the motion mechanism of ions and neutral atoms in the plume area is a very effective means to solve the above problems. . [0003] As the most basic method of plasma ...

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Problems solved by technology

but it cannot measure the velocity distribution of ions and neutral atoms

And as an entity's intrusion into the plasma, the probe will inevitably interfere with the plasma

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