一种用于微牛顿推进器推力测量的复摆。

A compound pendulum for thrust measurement of micro-Newton thruster.

作者信息

Xu Hao, Gao Yong, Mao Qiang-Bing, Ye Liang-Wen, Hu Zhong-Kun, Zhang Kai, Song Peiyi, Li Qing

机构信息

MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

Beijing Institute of Control Engineering, Beijing 100190, People's Republic of China.

出版信息

Rev Sci Instrum. 2022 Jun 1;93(6):064501. doi: 10.1063/5.0090980.

DOI:10.1063/5.0090980

PMID:35778050

Abstract

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.

摘要

研制了一种用于在地面测试微牛顿级推进器的推力台。该推力台由一个通过两条薄铍铜带对称悬挂的复合摆组成，并通过重力进行精确校准。通过一个配重可将推力台的刚度在3个数量级内进行调节。当刚度大于1 Nm/rad时，推力台对推力表现出快速响应。推力台的测量范围达到1000 μN，在1 mHz - 1 Hz范围内噪声小于0.1 μN/Hz。为了校准推力台的分辨率，用一个致动器向推力台施加静电力。等效推力确定为0.09 μN，标准不确定度为0.02 μN。使用该推力台对一个微牛顿胶体推进器进行了测试。胶体推进器的输出随施加电压的变化为0.015(1) μN/V。当电压改变50 V时，测得推力变化为0.7 μN，标准不确定度为0.1 μN。