Abstract: 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.

Abstract: A device for fastening an optical unit to an actuating ring of an actuating device including a fastening ring joined to the actuating ring and having a plurality of securing shims bonded to the optical unit and connected to the fastening ring by flexible axial tongues. The device can be applied to a triaxial laser gyrometer.

Abstract: In the disclosed laser gyrometer, the three resonant optical cavities of the block are connected to a cathode chamber by means of the three cathode capillary tubes and to a balancing chamber by means of three balancing capillary tubes. The axis of the cathode is identified with the axis of actuation. The block is actuated by means of an actuating ring in thermal contact with the cathode so as to provide for dissipation of the heat generated at the cathode. The invention makes it possible to solve the problems relating to wobble (or lack of dynamic balance) as well as thermal gradients.