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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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that for the thrust that is constantly changing with time generated by the micro thruster, traditional thrust measurement methods such as torsion pendulum and electromagnetic balance cannot measure the instantaneous thrust value of the thruster and the measurement process of the piezoelectric sensor In view of the shortcoming that the thruster is susceptible to electromagnetic interference, a transient thrust measurement system that can measure the thruster's transient thrust and record the entire process of the thruster's thrust change is proposed

The present invention applies the dynamic photoelastic method to the measurement field of the thruster's transient thrust. On the one hand, it has the advantages of simple structure, easy operation and high reliability. The most important thing is to solve the problem that the traditional thrust measurement method is difficult to measure the transient thrust. method

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