Patent ID: 7104128

Claim:
A differential accelerometer micromachined in a plane plate, comprising: a base and a differential measurement cell which includes a moveable seismic mass and two force sensors that are connected to the mass and to the base, wherein, under the effect of an acceleration along Ox and/or Oy, Ox and Oy being directions orthogonal to each other, the seismic mass is capable of undergoing linear displacement along a direction parallel to the acceleration, and has a center of gravity located at the intersection of a plane A 1 perpendicular to the plane of the plate and passing through Ox and of a plane A 2 perpendicular to the plane of the plate and passing through Oy and wherein a first force sensor comprises, along Ox, two identical detection systems for a differential measurement of the linear displacement along Ox, and associated with each detection system a filtering system connected to the base, and a second force sensor comprises, along Oy, two other identical detection systems for a differential measurement of the linear displacement along Oy, and associated with each detection system a filtering system connected to the base, each filtering system allowing the associated detection system to move along a direction perpendicular to that of its detection without permitting it to move along its detection direction.