New determination of the gravitational constant G with time-of-swing method
New determination of the gravitational constant G with time-of-swing method
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用摆动时间法测定引力常数 G 的新方法
DOI：
10.1103/physrevd.82.022001
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发表时间：
2010-07
期刊：
影响因子：
--
通讯作者：
Luo, Jun
中科院分区：
文献类型：
--
作者：
Tu, Liang-Cheng;Li, Qing;Wang, Qing-Lan;Shao, Cheng-Gang;Yang, Shan-Qing;Liu, Lin-Xia;Liu, Qi;Luo, Jun
本文提出了用扭摆摆动时间法测定牛顿引力常数G的一种新方法。与我们以前用同样方法测量的结果相比，我们做了以下几点改进：（1）用两个密度更均匀的不锈钢球代替原来的圆柱体作为源质量，测量了质心相对于几何中心的偏移量，发现它比圆柱体小得多;（2）采用矩形玻璃块作为摆的主体，减少了振动模态，提高了周期的稳定性，减小了转动惯量的不确定性;（3）将摆和源质量放在同一真空室内，减小了相对位置测量的误差;（iv）通过使用步进电机远程操作在“近"和”远"位置之间改变配置，以降低环境干扰;以及（v）首先通过使用两个盘状样品在高Q石英光纤的帮助下直接测量扭转光纤的滞弹性效应。我们已经进行了两次独立的G测量，更多»并且两个G值仅相差9 ppm。G的组合值为（6.673 49{+-}0.000 18）x10{sup -11} m{sup 3} kg{sup -1} s{sup -2}，相对不确定度为26 ppm。«少
A new determination of the Newtonian gravitational constant G is presented by using a torsion pendulum with the time-of-swing method. Compared with our previous measurement with the same method, several improvements greatly reduced the uncertainties as follows: (i) two stainless steel spheres with more homogeneous density are used as the source masses instead of the cylinders used in the previous experiment, and the offset of the mass center from the geometric center is measured and found to be much smaller than that of the cylinders; (ii) a rectangular glass block is used as the main body of the pendulum, which has fewer vibration modes and hence improves the stability of the period and reduces the uncertainty of the moment of inertia; (iii) both the pendulum and source masses are placed in the same vacuum chamber to reduce the error of measuring the relative positions; (iv) changing the configurations between the ''near'' and ''far'' positions is remotely operated by using a stepper motor to lower the environmental disturbances; and (v) the anelastic effect of the torsion fiber is first measured directly by using two disk pendulums with the help of a high-Q quartz fiber. We have performed two independent G measurements,more » and the two G values differ by only 9 ppm. The combined value of G is (6.673 49{+-}0.000 18)x10{sup -11} m{sup 3} kg{sup -1} s{sup -2} with a relative uncertainty of 26 ppm.« less
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DOI：
10.1109/te.2003.813896
发表时间：
2003-08
期刊：
IEEE Trans. Educ.
影响因子：
--
作者：
U. Klein;W. Vollmann;P. J. Abatti
通讯作者：
U. Klein;W. Vollmann;P. J. Abatti
影响因子：
2.6
作者：
Xiang Fan;Qi Liu;Lin-Xia Liu;V. Milyukov;Jun Luo
通讯作者：
Xiang Fan;Qi Liu;Lin-Xia Liu;V. Milyukov;Jun Luo
影响因子：
5
作者：
S. Schlamminger;E. Holzschuh;W. Kundig;F. Nolting;R. Pixley;J. Schurr;U. Straumann
通讯作者：
S. Schlamminger;E. Holzschuh;W. Kundig;F. Nolting;R. Pixley;J. Schurr;U. Straumann
影响因子：
3.5
作者：
Hu Zhong-kun;Wang Xue-li;L. Jun
通讯作者：
Hu Zhong-kun;Wang Xue-li;L. Jun
影响因子：
2.6
作者：
K. Numata;K. Yamamoto;H. Ishimoto;S. Otsuka;K. Kawabe;M. Ando;K. Tsubono
通讯作者：
K. Numata;K. Yamamoto;H. Ishimoto;S. Otsuka;K. Kawabe;M. Ando;K. Tsubono