English
 
通知: ·5月8日学术报告    ·4月25日学术报告    ·4月17日学术报告    ·4月14日学术报告    ·4月11日学术报告   
 
 


  最新进展

  研究小组
  ·2013年5月小组照片
·2014年9月小组照片
  研究方向
  科研项目
  研究成果
  ·发表论文
·获奖
·专利
  最新进展
 

最新进展 您的位置是: 首页 > 科学研究 > 最新进展 > 正文

 

Feedback control of torsion balance in measurement of gravitational constant G with angular acceleration method

发布时间:2014-02-25          来源:涂良成           浏览次数:

Feedback control of torsion balance in measurement of gravitational constant G with angular acceleration method

REVIEW OF SCIENTIFIC INSTRUMENTS 85, 014501 (2014)

Li-Di Quan,1,2 Chao Xue,1 Cheng-Gang Shao,1 Shan-Qing Yang,1 Liang-Cheng Tu,1 Yong-Ji Wang,2 and Jun Luo1,a)
1MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
2School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic of China
(Received 11 August 2013; accepted 18 December 2013; published online 10 January 2014)


The performance of the feedback control system is of central importance in the measurement of the Newton’s gravitational constant G with angular acceleration method. In this paper, a PID (Proportion-Integration-Differentiation) feedback loop is discussed in detail. Experimental results show that, with the feedback control activated, the twist angle of the torsion balance is limited to 7.3 × 10−7rad/Hz at the signal frequency of 2 mHz, which contributes a 0.4 ppm uncertainty to the G value. © 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4861189]

上一篇:High-κ Al2O3 material in low temperature wafer-level bonding for 3D integration application
下一篇:专利:落塔或者落井设备中落舱微重力水平改善装置
 
 
 

Copyright (C) 华中科技大学引力实验中心 地址:湖北省武汉市洪山区珞喻路1037号 邮编:430074 技术支持:尚网互联