Patent ID: 8826737
Filing Date: 2014-09-09
Classification: G01C

Abstract:
1. Vibrating structure gyrometer with at least one tuning fork, produced by micro-machining from a thin plate, the said tuning fork comprising a pair of mobile inertial assemblies (EIM 1 , EIM 2 ) linked by a coupling assembly ( 1 ), one mobile inertial assembly (EIM 1 , EIM 2 ) being furnished with first stiffness elements ( 2 , 2 ′) essentially deformable in the plane of the plate along a drive axis x and with second stiffness elements ( 3 , 3 ′) essentially deformable in the plane of the plate along a sense axis y substantially perpendicular to the x axis, the gyrometer comprising, furthermore, for the tuning fork, two first controlled electrodes ( 4 , 4 ′) for electrostatic excitation along the drive axis x which are respectively associated with the two mobile inertial assemblies (EIM 1 , EIM 2 ), two second controlled electrodes ( 5 , 5 ′) for capacitive detection of the drive resonator along the drive axis x which are respectively associated with the two mobile inertial assemblies (EIM 1 , EIM 2 ), two third controlled electrodes ( 6 , 6 ′) for capacitive detection of the drive motion along the sense axis y which are respectively associated with the two mobile inertial assemblies (EIM 1 , EIM 2 ), and two fourth controlled electrodes ( control means (UCE) adapted for applying two respective continuous electrical voltages V in which: f f μ c a represents a coefficient characterizing the influence of a discrepancy in stiffness between the two branches of the tuning fork on the sensitivity of the gyrometer to linear accelerations along the y axis, in deg·h λ V G equals 9.81 m·s