Mechanical characterisation of the TorPeDO: a low frequency gravitational force sensor
Mechanical characterisation of the TorPeDO: a low frequency gravitational force sensor
复制标题
TorPeDO 的机械特性：低频重力传感器
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
B. Slagmolen
中科院分区：
文献类型：
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作者：
D. McManus;P. Forsyth;M. Yap;R. Ward;D. Shaddock;D. McClelland;B. Slagmolen
牛顿噪声很可能是Advanced LIGO和其他第二代引力波探测器在低频下的未来挑战。我们提出的TorPeDO系统：一个双扭摆传感器，旨在测量当地的重力，以高精度。重力引起两个扭转梁之间的差动旋转，这是用光学读出测量。这两个扭转阻尼器有一个共同的悬挂点，可调的质量中心，和谐振频率。这产生高水平的机械共模噪声消除。我们报告的TorPeDO系统的控制原型，提出的频率响应和调谐范围的两个频率响应。本文还提出了该系统的噪声预算和机械交叉耦合模型。我们证明了两个扭转频率调谐到4.3 μHz的差异。
Newtonian noise is likely to be a future challenge at low frequencies for Advanced LIGO and other second generation gravitational wave detectors. We present the TorPeDO system: a dual torsion pendulum sensor designed to measure local gravitational forces to high precision. Gravitational forces induce a differential rotation between the two torsion beams, which is measured with an optical read-out. Both torsion pendulums have a common suspension point, tunable centre of mass, and resonant frequency. This produces a high level of mechanical common mode noise cancellation. We report on a controls prototype of the TorPeDO system, presenting the frequency response and tuning range of both pendulums. A noise budget and mechanical cross-coupling model for this system are also presented. We demonstrate frequency tuning of the two torsion pendulums to a difference of 4.3 μHz.