引力常数G的测量实验中球三点支撑研究
引力常数G的测量实验中球三点支撑研究
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DOI：
10.1063/1.4944475
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发表时间：
2016
影响因子：
1.6
通讯作者：
罗俊
中科院分区：
文献类型：
--
作者：
黎卿;刘建平;薛超;邬俊飞;杨山清;罗俊
我们小组目前对重力常数G的精确测量是通过两种不同的方法进行的：摆动时间法（ToS）和角加速度反馈法。在这两种方法中，均采用不锈钢球体作为源质量，球体的位置稳定性是一个重要参数，它为支撑极其需要的球体提供合适的安装座。本文介绍了一种升级版的三点安装座，并进行了详细的测试。实验结果表明，对于ToS方法中使用的三点安装座支撑的球体，其重复性、温度影响和振动影响均小于0.1μm（G值约为2ppm）。对于 AAF 方法中使用的三点支架支撑的球体，得到了类似的结果，由于 1 ℃ 的温度变化，球体位置的最大变化约为 0.6 μm，这也导致 G 值的不确定性为 2 ppm。
The ongoing precision measurement of the gravitational constant G at our group is performed by.using two different kinds of methods: time-of-swing method (ToS) and angular acceleration feedback.method. In the two methods, the stainless steel spheres are employed as source masses, and the.position stability of the spheres is an important parameter, which make suitable mounts for supporting.the spheres needed extremely. In this paper, an upgraded three-point mount is introduced and tested.in detail. Experimental results show that, for the sphere supported by the three-point mount used in.the ToS method, the repeatability, the temperature influence, and the vibration influence are all less.than 0.1 μm (about 2 ppm for the value of G). For the sphere supported by the three-point mount used.in the AAF method, similar results are obtained, the largest change of the sphere’s position is about.0.6 μm, introduced by a temperature change of 1 ◦C, which also results in an uncertainty of 2 ppm.for the value of G.