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

 

Preliminary determination of Newtonian gravitational constant with angular acceleration feedback method

发布时间:2014-09-09          来源:涂良成           浏览次数:

Preliminary determination of Newtonian gravitational constant with angular acceleration feedback method

Phil. Trans. R. Soc. A 2014 372, 20140031

Chao Xue1, Li-Di Quan1,2, Shan-Qing Yang1, Bing-PengWang1, Jun-FeiWu1, Cheng-Gang Shao1, Liang-Cheng Tu1, Vadim Milyukov3 and Jun Luo1

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

3Sternberg Astronomical Institute, Moscow State University, Moscow 119992, Russia

e-mail: junluo@mail.hust.edu.cn

This paper describes the preliminary measurement of the Newtonian gravitational constant G with the angular acceleration feedback method at HUST. The apparatus has been built, and preliminary measurement performed, to test all aspects of the experimental design, particularly the feedback function, which was recently discussed in detail by Quan et al. The experimental results show that the residual twist angle of the torsion pendulum at the signal frequency introduces 0.4 ppm to the value of G. The relative uncertainty of the angular acceleration of the turntable is approximately 100 ppm, which is mainly limited by the stability of the apparatus. Therefore, the experiment has been modified with three features: (i) the height of the apparatus is reduced almost by half, (ii) the aluminium shelves were replaced with shelves made from ultra-low expansion material and (iii) a perfect compensation of the laboratory-fixed gravitational background will be carried out. With these improvements, the angular acceleration is expected to be determined with an uncertainty of better than 10 ppm, and a reliable value of G with 20 ppm or below will be obtained in the near future.

 

上一篇:G measurements with time-of-swing method at HUST
下一篇:Operating an atom-interferometry-based gravity gradiometer by the dual-fringe-locking method
 
 
 

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