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The effect of shot noise on the accuracy with which the resonance frequency of a Fabry–Perot interferometer can be measured in the Pound–Drever scheme is considered. A Poisson random process with independent instants when individual pulses (electrons) occur is used as a model of periodically nonstationary shot noise.
The possibility of obtaining geophysical information from the system for controlling the position of the mirrors of the VIRGO laser-interferometric gravitational antenna and from angular perturbations of the vertical mirror lines is examined. Results from a study of tidal horizontal deformations are analyzed.
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