New Mach Probe

Abstract

The invention provides a novel Mach probe, and relates to the technical field of vacuum plume parameter diagnosis equipment of an electrical thruster. The novel Mach probe provided by the invention provides a first collection module and a second collection module, wherein the first collection module comprises a cylindrical probe, an extension direction of the cylindrical probe is parallel to a plume flowing direction, a surface of a cylindrical side of the cylindrical probe is used for collecting flow field ions, the second collection module comprises a planar probe, the planar probe is provided with a through hole and a collection end surface, the through hole is used for the cylindrical probe to penetrate through, the collection end surface is used for collecting the flow field ions, a plane wherein the collection end surface is perpendicular to the plume flowing direction, and the planar probe and the cylindrical probe are insulated by an insulation sheath sleeving the planar probe.When the novel Mach probe provided by the invention is used, the ions can be directly collided onto the collection end surface and are collected to generate an ion current, meanwhile, the ions are accelerated by a target layer of the cylindrical probe and then are collected to generate the ion current, the collection process is free from the influence of flowing speed of a flow field, and the measurement result is more accurate.

Description

technical field [0001] The invention relates to the technical field of diagnostic equipment for vacuum plume parameters of an electric thruster, in particular to a novel Mach probe. Background technique [0002] Electric thrusters such as ion thrusters and Hall thrusters are widely used in spacecraft attitude and orbit control because of their advantages such as high specific impulse, long life and small system mass. Accurately obtaining the vacuum plume parameters of an electric thruster is crucial for evaluating the performance of an electric thruster. [0003] The plume ejected by the nozzle of the electric thruster in vacuum is plasma, which contains electrons with only thermal motion emitted by the hollow cathode and ions with negligible thermal motion drawn out by grid acceleration. The macroscopic velocity of the ions in the plume is the plume velocity. [0004] The Mach probe is a kind of contact plasma diagnostic tool, which is used to obtain the Mach number of th...

AI Technical Summary

Problems solved by technology

The traditional Mach probe is composed of two parallel cylindrical tungsten wires, which are completely immersed in the vacuum plume during use, so that the plume flows vertically to the tungsten wire, which makes the flow field at the front end of the flow field when the flow velocity is too high The tungsten wire of the back-end tungsten wire produces severe interference, which affects the accuracy of the measurement results and leads to inaccurate measurement results

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