Vibrating beam accelerometer

US7124633B2 · kind B2 · utility

Assignee

• THALES · FR

Inventors

• Régis Quer · Valence, FR
• Jérôme Inglese · Valence, FR
• Claude Rougeot · Val-de-Reuil, FR

Key dates

• Filing date: Dec 1, 2003
• Grant date: Oct 24, 2006
• Expiry date: Dec 1, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P15/097
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Accelerometer micromachined in a plane plate comprising a base, and at least one measurement cell including a moveable seismic mass connected to the base and capable of moving translationally along the sensitive y axis of the accelerometer under the effect of an acceleration γ along this y axis, a resonator cell that comprises a resonator that can vibrate and be subjected to a tensile or compressive force depending on the direction of the acceleration γ and is placed symmetrically with respect to an axis of symmetry S of the structure, this axis S being parallel to the y axis and passing through the center of gravity of the seismic mass, the measurement cell furthermore including amplification means for amplifying the acceleration force, which means comprise at least one anchoring foot for anchoring to the base, two rigid terminations of the resonator cell and two pairs of micromachined arms symmetrical with respect to the axis S, each pair comprising a first arm connecting a termination to the seismic mass, and a second arm connecting the same termination to the anchoring foot, the angle α between the Ox axis and the first arm being small enough for the tensile or compressive forc…