We have measured the transfer function of the recently proposed folded pendulum which has a resonant period up to 66 s. Results confirm that the dynamic behavior of the folded pendulum closely approximates that of a simple pendulum of the same period. The system can provide a simple one-dimensional seismic isolation stage for laser interferometer gravitational wave antennas, as well as having application to very low frequency seismometers.
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Liu et al. (1995) studied this question.
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