摘要
空间引力波探测任务需要具有亚微牛级推力分辨率和推力噪声的微推力器来实现卫星平台高精度无拖曳控制任务,为了在地面对所需微推力器的推力进行标定,设计并研制了一套基于扭摆的亚微牛级推力测量系统。该系统选用高精度、高分辨率电容式位移传感器作为扭摆角位移传感装置,利用高精度电子天平对静电梳进行标定,再利用该静电梳标定扭摆,得到推力与角位移的关系。此外,研究了高精度弱力标定技术和亚微牛级微推力在线测量技术,分析了测量误差来源以及控制方案,最后利用静电梳产生标准弱力测量扭摆推力分辨能力和范围等。实验结果表明:该系统可测推力范围为0~400μN,分辨率达到0.1μN,背景噪声功率谱密度优于0.1μN/√Hz(10 mHz^1 Hz),满足空间引力波探测在10 mHz^1 Hz频段推力测量需求。
The space gravitational wave detection mission requires a micro-thruster with sub-micro-scale thrust resolution and thrust noise to achieve high-precision drag-free control tasks for satellite platforms.In order to calibrate the thrust of the above-mentioned micro-thrusters on the ground,a set of sub-micro-scale thrust measurement systems using a torsion pendulum is designed.The system uses a high-precision and high-resolution capacitive displacement sensor as the torsion swing angle displacement sensing device.A high-precision electronic balance is used to calibrate an electrostatic comb,and the static comb is used to observe the torsion pendulum to obtain the relationship between thrust and angular displacement.In addition,high-precision weak force calibration technology and sub-micro-scale micro-thrust on-line measurement technology are studied.The measurement error source and control scheme are analyzed.Finally,the static weak comb is used to generate a standard weak force to measure the torsion pendulum thrust resolution capability and range.The experimental results show that the system can measure a thrust range of 0.1μN to 400μN with a resolution that reaches 0.1μN,and a background noise power spectral density of better than 0.1μN/√Hz(10 mHz^1 Hz),which satisfies the requirements of space gravitational wave detection in the thrust measurement range of 10 mHz-1 Hz.
作者
杨超
贺建武
康琦
段俐
YANG Chao;HE Jian-wu;KANG Qi;DUAN Li(National Micro Gravity Laboratory,Institute of Mechanics,CAS,Beijing 100190,China;School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中国光学》
EI
CAS
CSCD
北大核心
2019年第3期526-534,共9页
Chinese Optics
基金
中国科学院战略性先导科技专项资助项目(No.XDB23030300,No.XDA1502070901-01,No.XDA1502070503)~~
关键词
引力波
扭摆
微推力器
弱力测量
gravitational wave
torsion balance
micro thrust
measurement of weak force
