Electric-propulsion-field microthrust transient measurement system based on dynamic photoelastic method

Abstract

The invention relates to an electric-propulsion-field microthrust transient measurement system based on a dynamic photoelastic method. In the invention, according to a thrust characteristic of electric propulsion, based on the dynamic photoelastic method, an optical elastic component is taken as a core so as to construct an optical path system; and through measuring real-time changes of an optical stripe image under a stress, instantaneous stress size and change conditions are displayed. The system comprises a laser, the optical elastic component, a high-speed transient image collector and a necessary image processing technology. The system is mainly used for collecting transient thrusts which are continuously changed along with time and are generated by a pulse-type propulsion system. The system is based on a stress-optical law. A photoelastic special material and a high-speed photography device are used to visualize the thrusts generated by a thruster, and a change process of the thrusts is especially recorded so as to research a change mechanism of the thrusts of an electric propulsion thruster.

Description

technical field

[0001] The invention relates to a micro-thrust measurement system, in particular to a real-time measurement system for the micro-thrust in the field of electric propulsion. Background technique

[0002] At present, the domestic high-precision measurement of micro-thrust and micro-impulse of electric propulsion thrusters is more commonly based on thrust measurement systems such as simple pendulum, inverted pendulum, and torsion pendulum. Among them, when the electromagnetic balance based on the inverted pendulum principle measures the impulse, there is a serious zero point drift, and the unstable balance position of the electromagnetic balance also leads to poor measurement accuracy. Therefore, it can generally only be used for qualitative or semi-quantitative analysis.

[0003] Relatively speaking, the use of torsion pendulum to measure thrust or impulse has high accuracy and sensitivity. The history of torsion pendulum can be traced back to the torsion balan...

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