GRAVITATIONAL VARIOMETRE Russian patent published in 2011 - IPC G01V7/10 

FIELD: physics.

SUBSTANCE: gravitational variometre has a torsional system with a working body in form of a dumb-bell balancing arm. The invention is characterised by that the torsional system as a physical pendulum is tuned into resonance at one of the frequencies of the spectrum of surface waves emitted from a zone of anomalous seismic activity at the earthquake focus. The useful signal is measured in the azimuthal loop of the torsional system. Resonance tuning of the physical pendulum is provided by contactless magnetic levitation of the torsional system with elements for indicating and controlling its movement when the mobile system is put into an evacuated housing. The gravitational variometre is fitted with a subassembly in order to eliminate errors.

EFFECT: constant operating clearance between rotor and stator elements of source information sensors.

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