Low Frequency Isolation Systems for Gravitational Wave Interferometers

激光干涉仪引力波探测器的端镜安装在钟摆上，使其免受干扰。将研究将钟摆支撑点与频率为1至10赫兹的地面运动非常牢固地隔离开来的方法。目前正在建造一个初步隔离级，并将设计、建造和测试另外两个噪音低得多的隔离级。由于这三个阶段一起工作，最终的隔离平台的位移和倾斜噪音将比以往任何时候都要低。然后，最后的平台将用来悬挂两个钟摆，这样就可以直接测量钟摆支撑线中热噪声的影响。本研究的目的是寻找实用的方法来支撑引力波探测器中的反射镜，使反射镜分离中频率为1 ~ 10 Hz的噪声可以减少为地面和空气密度波动引起的局部产生的引力场的不可避免的影响。这将有助于探测来自天文来源的引力波信号，这些信号在较高频率下辐射不强。所开发的低频隔离方法可能在工业和其他科学测量中有用。

Laser interferometer gravitational wave detectors have their end mirrors mounted on pendulums to isolate them from disturbances. Research will be carried out on methods for very strongly isolating the support points for the pendulums from ground motions at frequencies of 1 to 10 Hz. A preliminary isolation stage is now being constructed, and two additional stages with much lower noise will be designed, built and tested. With all three stages operating together, the final isolated platform will have lower displacement and tilt noise than ever has been achieved before. Then, the final platform will be used to suspend two pendulums so that the effects of thermally generated noise in the pendulum support wires can be measured directly. The goal of this research is to find practical ways of supporting the mirrors in gravitational wave detectors so that the noise in the mirror separation at frequencies of 1 to 10 Hz can be reduced to the unavoidable effects of locally generated gravitational fields from density fluctuations in the ground and the air. This will aid in detecting gravitational wave signals from astronomical sources which do not radiate strongly at higher frequencies. The low frequency isolation methods developed are likely to be useful in industry and in other scientific measurements.