How can a portable reversible pendulum be used as a gravity meter?
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A portable reversible pendulum can be used as a gravity meter by measuring the oscillations of the pendulum caused by gravitational forces at audio-band frequencies. The pendulum, suspended as a mass, has resonance frequencies lower than the frequencies of the gravitational forces. To ensure accurate measurements, it is important to mitigate the reduction in sensitivity caused by thermal energy or seismic motion of the environment. This can be achieved through various methods such as seismic isolation, cryogenic cooling, and mechanical parametric cooling of the pendulum motion. Mechanical parametric feedback cooling has been demonstrated to achieve a damping factor of 5.7, reaching the quantum mechanical regime near the ground state . Torsion pendulums with low resonant frequencies have also been proposed for gravity gradiometers, allowing for good response to the fluctuation of local gravity field at low frequencies. However, the sensitivity of torsion pendulums can be affected by nonlinear vibration noise, which can be reduced through appropriate measures .
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Open access•Posted Content | The paper does not mention the use of a portable reversible pendulum as a gravity meter. |
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