VERTICAL GRAVITATIONAL GRADIENT METER Russian patent published in 2007 - IPC G01V7/00 

FIELD: geophysics, possible use for prospecting.

SUBSTANCE: vertical gravitational gradient meter contains vacuumized body, mounted wherein are two vertically spaced cylindrical reservoirs with working liquid, for example, mercury. Positioned in reservoirs are cylindrical floats, together with reservoirs and mercury forming upper and lower hydrostatic systems. Upper float is rigidly connected to lower vessel and through axial rod - to differential string transformer. Lower float is rigidly connected to upper reservoir and to body. Geometric parameters of reservoirs, floats and mercury in each hydrostatic system are selected so that hydrostatic forces active on floats and reservoirs are not dependent on temperature. New in proposed gradient meter is technology for making floats using materials with significant thermal expansion coefficient, for example, duralumin, and reservoirs - using materials with low thermal expansion coefficients, for example, invar. Both pairs of string transformers are connected to axial rod of upper float. Strings are positioned in mutually perpendicular vertical planes with similar nominal strains, resulting forces of which are directed along vertical in opposite directions and compensate each other.

EFFECT: expanded functional capabilities of device.

1 dwg