Thales

Sextant Avionique

Thomson-csf Sextant

Eric Loil

Etienne Bonnaudet

Yves Jaulain

Jacques Cordonnier

Bernard Chaumet

Andre Boura

Jean-Luc Vallee

François Perez

Jocelyn Be

Frédéric Sadrin

Frédéric Sardin

Natacha Szulga

Tristan Guillabeau

Serge Petit

Aerodynamic measurement probe for measuring a local incidence of airflow

A laser gyro includes a cylindrical solid amplifier bar having an axis of revolution. The laser gyro also includes: an annular piezoelectric element for exciting said solid amplifier element at a predetermined frequency f, along said axis of revolution, said annular piezoelectric element being mounted fixed on one of the two end cross sections of the cylindrical solid amplifier bar so that its axis of revolution coincides with said axis of revolution of said cylindrical solid amplifier bar; and an annular dynamic counterweight mounted fixed on the free end cross section of said annular piezoelectric element so that its axis of revolution coincides with said axis of revolution of said cylindrical solid amplifier bar; said cylindrical solid amplifier bar being dimensioned so as to be considered nondeformable at said excitation frequency f.

Laser gyro comprising a cylindrical solid amplifier bar, and associated method for exciting a cylindrical solid amplifier bar of a laser gyro

The invention relates to a gyrometer based on a vibrating structure, produced by micromachining in a thin planar wafer, including two symmetrical moving assemblies coupled by a coupling structure connecting these two assemblies in order to allow transfer of mechanical vibration energy between them, each moving assembly comprising three moving elements, a first inertial moving element intended to vibrate in two orthogonal directions Ox and Oy in the plane of the wafer, a second moving element intended to vibrate along Oy and connected to the first moving element and to fixed anchoring zones, by first linking means which allow the vibration movement of the first moving element along Oy to be transmitted to the second moving element without permitting movement of the second element along the Ox direction and a third moving element intended to vibrate along Oy and connected to the second moving element and to fixed anchoring zones by second linking means which allow the vibration movement of the second moving element along Oy to be transmitted, in phase opposition, to the third moving element.

Micromachined double tuning-fork gyrometer with detection in the plane of the machined wafer

An actuating motion detection device for a mechanically actuated gyrolaser including at least one fastening ring coaxial with an actuation axis of the gyrolaser. The fastening ring includes a hub held at a center of a rim by radial flexible strips distributed about the hub, and the radial flexible strips are configured to act as springs and to vibrate under an actuating motion. The motion detecting device includes torsion detectors having a pair of piezoelectric plates disposed at a radial position along one radial flexible strip. The piezoelectric plates have respective remanent magnetic fields aligned in opposite directions, and each piezoelectric plate has two electrodes positioned on opposite sides of the piezoelectric plate with one of the two electrodes contacting the radial flexible strip. The electrodes are connected to a common output. In response to deformations of the flexible strips due to rotational motions along the actuation axis, the torsion detectors generate electrical signals of a same polarity that collect at the common output. In response to deformations of the flexible strips coming from motions not along the actuation axis, the torsion detectors generate electrical signals that cancel at the common output.

Device for detecting activation movement for laser gyroscope

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.

Device to fasten a laser gyrometer optical unit to an actuating mechanism

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.

Triaxial laser gyrometer including an actuating mechanism in thermal

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Chatellerault, France

Eric Loil