Nonlinear vibration transfer in torsion pendulums
Nonlinear vibration transfer in torsion pendulums
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DOI：
10.1088/1361-6382/ab2162
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发表时间：
2018-12
影响因子：
3.5
通讯作者：
T. Shimoda;M. Ando
中科院分区：
文献类型：
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作者：
T. Shimoda;M. Ando
扭摆由于其较小的恢复力适合于微小的力测量，在物理实验中得到了广泛的应用。近年来，低频重力梯度仪的一些应用已经被提出，主要是因为它们的共振频率较低。具有低共振频率的扭转摆可以使悬浮质量与地面隔离，从而在低频下对局部重力场的波动有良好的响应。然而，地面平动振动可以非线性地传递到扭转摆的水平自转。这种效应对作为重力梯度计的扭转摆的灵敏度有不可忽略的贡献。本文对非线性振动噪声的大小进行了估算，并对如何降低非线性振动噪声进行了探讨。
Torsion pendulums have been widely used in physical experiments, because their small restoring forces are suitable for tiny force measurement. Recently, some applications such as low-frequency gravity gradiometers have been proposed by focusing on their low resonant frequencies. Torsion pendulums with low resonant frequencies enable the suspended masses to be isolated from the ground, allowing for good response to the fluctuation of local gravity field at low frequencies. However, translational ground vibration can be transferred to the horizontal rotation of the torsion pendulum nonlinearly. This effect can have a non-negligible contribution to the sensitivity of torsion pendulums as gravity gradiometers. This paper evaluates the amount of nonlinear vibration noise, and discusses how to reduce it.