VIBRATION SENSOR

A vibration sensor includes: a supporting structure provided with a cavity; a proof mass accommodated in the cavity; a plurality of elastic bodies, each connecting the proof mass to the supporting structure along a corresponding connection axis; an optical fibre portion arranged in contact with each elastic body and wound around the corresponding connection axis. The proof mass has an elongated shape according to a main reference direction (Z), and the plurality of elastic bodies comprises two or more first elastic bodies which are spaced along the main reference direction (Z) and are arranged so that they are all caused to be simultaneously compressed along their corresponding connection axes following a displacement of the proof mass in a first reference direction (X) perpendicular to the main reference direction (Z), and simultaneously stretched along their corresponding connection axes following a displacement of the proof mass in a direction opposite the first reference direction.