A Reversible Beam Divergence Angle Movement Measuring Mechanism

Abstract

The invention discloses a reversible beam divergence angle mobile measurement mechanism. Through a reversible mechanism, a beam divergence angle measurement device can be moved out of a beam area after measurement or during the measuring process. The defect that beam divergence angle measurement is difficult and sensors and cables are easily short-circuited and damaged during long-term ignition of an ion thruster is solved. A rack is a double-layer structure: a rotating device is installed at the upper layer and the lower layer is a cavity with an opening. A crank is an inverted U-shaped structure. One arm of the crank is fixed on the rotating device, and the other arm of the crank is fixed on the beam divergence angle measurement device. In a test state, a test surface of the beam divergence angle measurement device is positioned in a test area and in a vertical state. When the beam divergence angle measurement device withdraws from the test, the rotating device rotates under the control of a stepper motor, and the crank drives the beam divergence angle measurement device to overturn downwards. The crank is contained into the second-layer cavity of the rack. The test surface of the beam divergence angle measurement device departs from the test area and is in a horizontal state.

Description

technical field [0001] The invention relates to the technical field of beam current testing of ion thrusters, in particular to a reversible beam divergence angle movement measurement mechanism. Background technique [0002] The beam divergence angle measurement is carried out by the beam divergence angle measuring device fixed in the cabin under the ignition state of the ion thruster. Although this method can meet the measurement requirements of the beam divergence angle of the ion thruster, because the beam divergence angle measurement device is in the beam current environment generated by the ignition of the ion thruster for a long time, the measurement sensor and the measurement cable will be damaged and short-circuited. Therefore, the ignition time of the ion thruster needs to be limited in a single measurement. [0003] Moreover, the Faraday probes currently used to measure the beam divergence angle are generally point distribution or line distribution, and the collect...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a reversible beam divergence angle movement measurement mechanism, which can move the beam divergence angle measurement device out of the beam region through the reversible mechanism after the measurement is completed or during the measurement process, and solves the problem of ion thrusters. Difficult to measure the beam divergence angle in the case of long-time ignition, short-circuit and damage to sensors and cables

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