Thales

Thomson-csf Sextant

Pierre Gallon

Bernard Chaumet

Etienne Bonnaudet

Jacques Cordonnier

Selvin David

The present invention relates to a laser gyro of the type comprising an optical block comprising three communicating resonant optical cavities which form a regular octahedron having eight triangular sides, each of the cavities presenting four capillary segments forming a square perpendicular to a corresponding sensitive axis, these cavities being arranged so that each of the angles of one cavity coincides and communicates with the angle of another cavity, a mirror associated with each pair of coinciding angles being oriented so as to be used by the two cavities forming said pair, each cavity using four mirrors including a reading mirror and a cavity-length servo mirror, said gyro also comprising an activation mechanism for driving the block according to a reciprocating rotation movement about an activation axis, and it is characterized in that this gyro comprises three cathodes each linked to two cavities out of the three, these two cavities being each time taken by circular permutation.

Device for improving the life of a triaxial gyro

The invention relates to a gyroscope comprising at least one mass capable of vibrating along an x axis at a resonant excitation frequency Fcapable of vibrating along a y axis perpendicular to the x axis, at a resonant detection frequency F, under the effect of a Coriolis force generated by a rotation about a z axis perpendicular to the x and y axes. It includes, connected to the mass or masses, a feedback control loop for controlling the resonant frequency Fso that Fis equal or practically equal to Fthroughout the duration of use of the gyroscope.

Vibrating rate gyro with slaving of detection frequency to excitation frequency

An antivibration elastic suspension in which a chassis of an inertial measurement unit is placed inside a casing. The inertial measurement unit includes a gyro assembly that is fixed to the chassis by two support rings flexible in terms of torsion and rotation around a fixed axis of the chassis. At least one flexible annular diaphragm is coaxial with the fixed axis and the flexible annular diaphragm is fixed by an interior periphery to an exterior periphery of the chassis and by an exterior periphery to an interior wall of the casing. The flexible annular diaphragm respects a symmetry of revolution exhibited by the gyro assembly with respect to the fixed axis.

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Vouneuil sur Vienne, France

Pierre Gallon