Development of thrust stand for low impulse measurement from microthrusters
Development of thrust stand for low impulse measurement from microthrusters
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DOI：
10.1063/1.1790568
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发表时间：
2004-09
影响因子：
1.6
通讯作者：
H. Koizumi;K. Komurasaki;Y. Arakawa
中科院分区：
文献类型：
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作者：
H. Koizumi;K. Komurasaki;Y. Arakawa
为了精确测量液体推进剂脉冲等离子体推力器和二极管激光烧蚀微推力器两种微推力器的推力，研制了一种推力台架。LP-PPT的脉冲范围为20 ~ 80 μNs。二极管激光微推力器是一种新型的微推力器，脉冲范围在1 ~ 10 μNs之间，持续时间约为1 s。背景振动引起的机械噪声成为精确估计推力的关键问题，特别是在低冲量测量中。提出了一种通过在拟合函数中引入附加项来降低机械噪声影响的数据分析方法。实验证明，在我们的实验条件下，使用的分析方法将噪声引起的方差降低到正常拟合方法的三分之一。LP-PPT的推力架精度为2.1 μNs，二极管激光微推力器的推力架精度为0.7 μNs。
A thrust stand has been developed to accurately measure thrust produced by two types of microthrusters—a liquid propellant pulsed plasma thruster (LP-PPT) and a diode laser ablation microthruster. The impulse of LP-PPT ranged from 20 to 80 μNs. The diode laser microthruster, which is a new type of microthruster, produces much lower impulse range of 1–10 μNs for about 1 s. The mechanical noise induced from the background vibrations becomes a crucial problem for precise estimate of thrust particularly in low impulse measurements. A data analysis method to reduce the effect of mechanical noise is proposed by introducing an additional term in a fitting function. It was verified that the analysis method used in our experimental conditions reduced variance caused by noise down to one-third that of a normal fitting method. The accuracy of the thrust stand is 2.1 μNs in the case of the LP-PPT and 0.7 μNs in the case of the diode laser microthruster.