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首页> 外文会议>Conference on Laser Frequency Stabilization, Standards, Measurement, and Applications Jan 24-26, 2001, San Jose, USA >A suspended Fabry-Perot interferometer for determining the Newtonian constant of gravitation
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A suspended Fabry-Perot interferometer for determining the Newtonian constant of gravitation

机译：悬浮法布里-珀罗干涉仪，用于确定牛顿引力常数

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摘要

Of all the fundamental constants of nature, the Newtonian constant of gravitation, G, has been one of the most difficult to measure. The current CODATA value of G has an uncertainty of 1.5 parts in 1000. Although recent experiments have produced values with uncertainties smaller than this, the adopted CODATA uncertainty reflects the fact that there is still substantial disagreement between the values from these experiments. The majority of previous measurements have used torsion pendulums or balances to convert the small gravitational attraction of a laboratory source mass into a relatively large mechanical displacement. However, our approach is to use simple pendulums, which results in a small displacement that we measure very accurately. This means that the attraction of the source masses is measured against a restoring force provided by earth's gravity rather than the less well-understood torsion of a wire. Also, the shorter period of our pendulums allows us to make measurements much more rapidly than in most other experiments. In our apparatus, two mirrors, each suspended as a simple pendulum, form a Fabry-Perot cavity. A He-Ne laser locked to this cavity monitors the relative displacement of these two pendulums (through changes in its frequency) as laboratory source masses are moved, altering the gravitational pull on the mirrors.
机译：在自然界的所有基本常数中，牛顿重力常数G是最难测量的常数之一。 G的当前CODATA值具有1000的1.5不确定度。尽管最近的实验得出的不确定度小于此数值，但采用的CODATA不确定度反映了以下事实：这些实验的值之间仍然存在很大分歧。先前的大多数测量都使用了扭摆或摆轮来将实验室源质量的小重力吸引转换为相对较大的机械位移。但是，我们的方法是使用简单的摆锤，从而产生很小的位移，我们可以非常精确地进行测量。这意味着源质量的吸引力是根据地心引力所产生的恢复力来衡量的，而不是相对不太容易理解的电线扭转来衡量的。同样，摆锤的较短周期使我们能够比大多数其他实验更快地进行测量。在我们的设备中，两个反射镜分别构成一个简单的摆锤，形成法布里-珀罗腔。当实验室源质量移动时，锁定到该腔的He-Ne激光器监视这两个摆的相对位移（通过其频率的变化），从而改变了镜子上的引力。

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