Patent ID: 6073490
Filing Date: 2000-06-13
Classification: G01P

Abstract:
A servo accelerometer, comprisinga detachable case comprising two symmetrically positioned bars of silicon monocrystal, in which bars implemented are cylindrical openings arranged along one axis of symmetry,a mounting frame disposed between said two bars and made of silicon monocrystal, the silicon monocrystal of said mounting frame having a same orientation as the silicon monocrystal of said case,a proof mass having a paddle whereon implemented are four projections and which paddle is disposed in said case on an elastic suspension means disposed in said mounting frame, said mounting frame, said paddle of the proof mass and said elastic suspensions constitute a single element of a structure made of silicon monocrystal,a differential pick-off of the angular-movement of a position of said proof mass relative to the case,a differential torque pick-off secured in said detachable case and having two movable coils and two sources of constant magnetic fluxes,means for compensating thermal expansions of said movable coils, said means being rigidly coupled to said movable coils and disposed between said movable coils and said paddle of the proof mass and secured on said paddle,means for compensating thermal expansions of a material of said case and a material of said constant magnetic fluxes sources, and disposed within a clearance between said bars and said constant magnetic fluxes sources,a servo amplifier electrically coupled to said differential angular-movement pick-off and said differential torque pick-off and constituting, together with said pick-offs, a compensating loop.