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US 4,301,683 AGranted
Elastic surface wave accelerometer
AssigneeThomson-CSF
InventorsPierre Hartemann, Jean-Paul Castera
Life of this patent
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Abstract
The invention relates to an accelerometer comprising at least one elastic plate propagating elastic surface waves, to which a normal force is applied resulting from the action of the acceleration which is to be measured on a solid or liquid body of predetermined mass. The measurement of the deviation in frequency of the oscillator of which the plate is a part gives an indication of the value of the normal component of the acceleration.
Claims10
An accelerometer using elastic surface waves, comprising:
- a frame;
- at least one elastic plate having opposing edges supported in said frame and subjected to the acceleration which is to be measured;
- means for emitting and means for receiving elastic surface waves on a front surface of said plate;
- amplifying means connecting said emitting means and said receiving means, so as to form an oscillator, the oscillation frequency of which is modulated by said acceleration;
- means for detecting the modulation of said oscillation frequency;
- mass means responsive to said acceleration for applying to the back surface of said plate a force causing deformation of said plate, said force being always located in a plane containing the normal to a flat central area of said back surface whatever is the direction of said acceleration;
- said mass means comprising a solid body having at least one flat central area and a rolling element pinched between said flat central areas.
4 more elements
Dependencies are inferred from the claim text.