A compound pendulum for thrust measurement of micro-Newton thruster.
A compound pendulum for thrust measurement of micro-Newton thruster.
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DOI：
10.1063/5.0090980
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Hao Xu;Yong Gao;Qiangbing Mao;Liang-Wen Ye;Zhongkun Hu;Kai Zhang;Peiyi Song;Qing Li
中科院分区：
文献类型：
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作者：
Hao Xu;Yong Gao;Qiangbing Mao;Liang-Wen Ye;Zhongkun Hu;Kai Zhang;Peiyi Song;Qing Li
研制了一种用于地面微牛顿级推力器测试的推力台。台架由一个复合钟摆组成，该钟摆对称地悬挂在两条薄铍铜条上，并通过重力精确校准。支架的刚度可以通过配重调整3个数量级。当刚度大于1 Nm/rad时，支架对推力的响应速度较快。机架的测量范围达到1000 μN，在1mhz ~ 1hz范围内噪声小于0.1 μN/Hz。为了校准支架的分辨率，用致动器对支架施加静电力。确定等效推力为0.09 μN，标准不确定度为0.02 μN。利用该支架对微牛顿胶体推力器进行了测试。当施加电压为0.015(1)μN/V时，胶体推力器的输出发生变化。当电压改变50 V时，测得推力变化量为0.7 μN，标准不确定度为0.1 μN。
A thrust stand is developed for testing micro-Newton level thrusters on the ground. The stand is composed of a compound pendulum that is symmetrically suspended by two thin beryllium copper strips, and it is precisely calibrated by gravity. The stiffness of the stand can be adjusted in 3 orders of magnitude by a counterweight. When the stiffness is larger than 1 Nm/rad, the stand demonstrates a fast response to thrust. The measured range of the stand reaches 1000 μN, and the noise is less than 0.1 μN/Hz within 1 mHz-1 Hz. To calibrate the resolution of the stand, an electrostatic force is applied to the stand with an actuator. The equivalent thrust is determined to be 0.09 μN with a standard uncertainty of 0.02 μN. Using the stand, a micro-Newton colloid thruster is tested. The output of the colloid thruster changes with the applied voltage as 0.015(1) μN/V. When changing the voltage by 50 V, the change in thrust is measured to be 0.7 μN with a standard uncertainty of 0.1 μN.