A key issue in developing pendular Fabry-Perot interferometers as very
accurate displacement measurement devices, is the noise level. The Fabry-Perot
pendulums are the most promising device to detect gravitational waves, and
therefore the background and the internal noise should be accurately measured
and reduced. In fact terminal masses generates additional internal noise mainly
due to thermal fluctuations and vibrations. We propose to exploit the
reflectivity change, that occurs in some special points, to monitor the
pendulums free oscillations and possibly estimate the noise level. We find that
in spite of long transients, it is an effective method for noise estimate. We
also prove that to only retain the sequence of escapes, rather than the whole
time dependent dynamics, entails the main characteristics of the phenomenon.
Escape times could also be relevant for future gravitational wave detector
developments.Comment: PREPRINT Metrology for Aerospace (MetroAeroSpace), 2014 IEEE
Publication Year: 2014, Page(s): 468 - 47
