| With the rapid development of aviation and aerospace, to these multi-mission satellites which have higher requirements for the attitude and orbit control, the small type of fuel thrusters cannot meet their needs. Currently, all kinds of electric-thrusters are developed and the best one has a high precision that reached sub-microNewton. However, there still exist a large number of difficulties to test and calibrate micro-thrusters at the level of sub-microNewton. So we proposed a design scheme which based on high-temperature superconducting displacement sensing technology and SOUID detecting technology to test and calibrate the micro-thrusters.There are used two superconducting accelerators to make the measurement of differential weak force come true. It has a lot of merits compared with others, such as fast response speed, wide measuring frequency band and high resolution. Moreover, it can realize the force measurement of micro-thrusters from submicro-Newton to10milli-Newton, and from dc to twenty hertz. In addition, we use a SQUID to detect the output’s change of differential signals. It can gurantee the readout noise meet the requirements of the measurement precision because the SQUID whose measurement precision has reached10-6Φ0as a commercialized commdity is the most accurate device to detect the magnetic flux.We have mainly stated the two type of instruement design, namely vectical and horizontal type. What’s more, according to the flux conservation of a superconducting loop, this paper analyzed the differential acceleration of the measurement principle and derived the transfer function of the thrust to output differential current. It also discussed the possible errors and noises. This design scheme of the high matured technology and low cost is of important value for the testing and calibration of developing high performance of micro thrusters in our country. |
