Sextant Avionique

Thales Avionics S.a.

Pierre Giroud

Pierre Guillemin

Sylvie Pedraza-Ramos

Andre Migeon

Olivier Lefort

Rene Presset

An electromagnetic accelerometer including a stationary stator element ( ) associated with a movable polar element ( ) securable to an external member ( ), the stationary stator element ( ) and the movable polar element ( ) forming a magnetic circuit and defining between them at least two gaps ( ), a magnet ( ) helping to create magnetic field lines in the magnetic circuit, a coil ( ) and a mechanism for energizing the coil for controlling the displacement of the movable polar element ( ) through electromagnetic induction phenomena. The electromagnetic accelerometer further includes an adjustment polar element ( ) for placing the movable polar element ( ) in an adjusted position with respect to that of the stationary stator element ( ), by deviating the magnetic field lines.

Electromagnetic actuator equipped with means for adjusting its mobile polar element

Accelerometer and method for making same

Electromagnetic accelerometer

An electromagnetic accelerometer includes a moving mass suspended to a peripheral frame and associated with stress gauges forming sensors for detecting the displacement of the moving mass which supports a coil, and a permanent magnet which is associated with a magnetic circuit formed by two pole pieces defining two air-gaps for channeling the magnetic field of the magnet. The moving mass includes a central recess having a surface at least equal to the surface of a free extremity of a first pole piece of the magnetic circuit and forming a shoulder for receiving the coil, the free extremity of the shoulder leading inside the air-gaps.

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Bourg les Valence, France

Pierre Giroud