Based On The Weak-force Torsion Balance Measurements Preliminary Analysis And Verification

The increasing interests in space science missions, more and more human’s explorations of space have be done in today. With the increase of human activity space science, space vehicle types of increasingly rich and advanced. As for propeller aircraft power system, its development level has reached the micro Newton. Micro thrust measuring device can accurately measure of propeller thrust and performance measurement results and according to the evaluation of propeller thrust and guide the improvement direction of propulsion research, shorten the development time and period of the propeller.In this thesis, the micro-space micro-thruster thrust measurement for the study, preliminary design of a complete torsion balance based on a weak force measurement system that uses a two-step calibration method as the experimental principle, which is the standard weak force generated torsion angle displacement measurement and calibration. Design and production of the corresponding experimental equipment, including twisted wire fixtures, torsion system, a standard weak force generating device, the vacuum system transformation, angular displacement measuring systems and optical lever Based on PSD reference measurement system. Two-step calibration experiments, the standard vacuum environment given the weak force of the torsion angle and the torsion mathematical relationship between displacement. In a vacuum environment of principle experiment, the measurement of the range of micro 4μN～180μN thrust measurement accuracy can be achieved 3μN, resolution of 1μN, gives the final set of calibration of the measuring device results FO=△θ-d, where the calibration factor is c=(1.9063±0.0226)×10-3μN/rad and d= (0.7658±0.1411)μN.It was found that the angular displacement calibration experiments in electromagnetic solenoid pitch changes within the vacuum system vibration and temperature fluctuations and other interfering factors on the torsion balance measurements will be the impact, while limiting the precision machining and assembly system minimum torsion balance thrust measurements. For the above design the corresponding suppression and measurement system improvement program for the next step to carry out experimental work laid the foundation.