Clearance-adjustable Faraday probe

Abstract

The invention provides a clearance-adjustable Faraday probe, and belongs to the field of electric propeller plasma measurement equipment. The clearance-adjustable Faraday probe comprises a collector,a first insulator, an adjustable clearance insulator, a protection ring and an adjusting bolt. The collector comprises a disc collection surface and a conductive rod which is connected with the collection surface. The first insulator sleeves the conductive rod. The protection ring is connected with the conductive rod. The outer edge of the collection surface and the internal wall surface of the protection ring have clearance. The adjustable clearance insulator sleeves outside the collector and the first insulator. The adjusting bolt and the adjustable clearance insulator are connected in a threaded way. The adjustable clearance insulator can be adjusted to stretch in or out of the clearance between the outer edge of the collection surface and the internal wall surface of the protection ring by rotating the adjusting bolt so that the Faraday probe is enabled to have two working conditions of common and clearance filling, the working condition is adjustable and thus the clearance error can be analyzed under the same dimension parameter.

Description

technical field [0001] The invention relates to the field of electric thruster plasma measurement equipment, in particular to a Faraday probe with adjustable gap. 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 electric thruster vacuum plume parameters is crucial to evaluating the performance of electric thrusters and spacecraft. [0003] The vacuum plume of an electric thruster is plasma, which mainly contains ions, electrons, and neutral gas molecules. The distribution of the beam current density in the plume is an important indicator for evaluating the life of the electric thruster and its plume effect. The Faraday probe is the measurement space A simple means and method for cation density distribution. [0004] 2. The gap error is an error caused by the gap bet...

AI Technical Summary

Problems solved by technology

[0004] 2. The gap error is an error caused by the gap between the collector and the guard ring. The reason is that after the ions are injected into the gap between the collector and the guard ring, due to the ion incident direction or negative bias voltage, the ions will Some are attracted by the collector, causing the current to increase

[0008] The above correction function is only a theoretical derivation, but due to the characteristics of the plasma itself and the environment and location factors in the measurement process, the correction accuracy is not reliable

Images