Tang Haibin, Shi Chenbo, Zhang Xin'ai, Zhang Zun, Cheng Jiao
School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China.
Rev Sci Instrum. 2011 Mar;82(3):035118. doi: 10.1063/1.3567803.
A thrust stand for accurately measuring impulse bits, which ranged from 10-1000 μN s using a noncontact electromagnetic calibration technique is described. In particular, a permanent magnet structure was designed to produce a uniform magnetic field, and a multiturn coil was made to produce a calibration force less than 10 mN. The electromagnetic calibration force for pulsed thrust measurements was linear to the coil current and changed less than 2.5% when the distance between the coil and magnet changed 6 mm. A pulsed plasma thruster was first tested on the thrust stand, and afterward five single impulse bits were measured to give a 310 μN s average impulse bit. Uncertainty of the measured impulse bit was analyzed to evaluate the quality of the measurement and was found to be 10 μN s with 95% credibility.
描述了一种用于精确测量脉冲冲量的推力台，其使用非接触式电磁校准技术，脉冲冲量范围为10 - 1000μN·s。具体而言，设计了一种永磁体结构以产生均匀磁场，并制作了一个多匝线圈以产生小于10 mN的校准力。用于脉冲推力测量的电磁校准力与线圈电流呈线性关系，当线圈与磁体之间的距离变化6 mm时，校准力变化小于2.5%。首先在该推力台上对脉冲等离子体推进器进行了测试，随后测量了五个单脉冲冲量，得到平均脉冲冲量为310μN·s。分析了测量脉冲冲量的不确定度以评估测量质量，发现其在95%置信度下为10μN·s。
