Seismic cross-coupling noise in torsion pendulums
Seismic cross-coupling noise in torsion pendulums
复制标题
扭摆中的地震交叉耦合噪声
DOI：
10.1103/physrevd.97.104003
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Yuta Michimura and Masaki Ando
中科院分区：
文献类型：
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作者：
T. Shimoda;Naoki Aritomi;Ayaka Shoda;Yuta Michimura and Masaki Ando
探测0.1Hz附近的低频引力波是未来引力波观测的重要目标之一。预期信号的主要来源之一是引力波从二进制中等质量黑洞合并，这是提出的超大质量黑洞的形成方案之一。通过使用扭转摆，其可以具有几个毫赫兹的共振频率，这样的信号可以在地面上测量，因为其旋转运动可以作为低至0.01赫兹的自由质量。然而，一个现实的扭摆灵敏度将遭受扭转位移噪声引入平移地面运动在主要频段的利益。本文对标准扭转试验中的地震交叉耦合噪声进行了系统的研究，并对标准扭转试验中的交叉耦合噪声的传递途径进行了分析。在此基础上，本文还提出了降低交叉耦合噪声的方案，并进行了实验验证。这一结果建立了一个基本的方法，以减少地震噪声在扭转的最显着的耦合路线。
Detection of low-frequency gravitational waves around 0.1 Hz is one of the important targets for future gravitational wave observation. One of the main sources of the expected signals is gravitational waves from binary intermediate-mass black hole coalescences which is proposed as one of the formation scenarios of supermassive black holes. By using a torsion pendulum, which can have a resonance frequency of a few millihertz, such signals can be measured on the ground since its rotational motion can act as a free mass down to 0.01 Hz. However, sensitivity of a realistic torsion pendulum will suffer from torsional displacement noise introduced from translational ground motion in the main frequency band of interest. Such noise is called seismic cross-coupling noise, and there has been little research on it. In this paper, systematic investigation is performed to identify routes of cross-coupling transfer for standard torsion pendulums. Based on the results, this paper also proposes reduction schemes of cross-coupling noise, and they were demonstrated experimentally in agreement with theory. This result establishes a basic way to reduce seismic noise in torsion pendulums for the most significant coupling routes.