Tuned borehole gravity gradiometer
AssigneeThe Standard Oil Company
InventorsTheodore V. Lautzenhiser, Anthony G. Nekut, Jr.
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Abstract
A tuned borehole gravity gradiometer comprises a dipole mass system having means for selectively tuning the sensitivity of the gravity gradiometer to detect variations in the earth's gravity gradient within a borehole. The tuning means includes varying the metacentric height of the dipole mass system by selectively varying the center of gravity of the dipole mass system with respect to the metacenter of the dipole mass system.
Claims10
A tuned borehole gravity gradiometer for detecting variations in gravity gradient comprising:
- a suspended dipole mass system having symmetrically distributed dipole masses and suspension means for suspending the dipole masses such that the gravity gradient to be measured produces an angular displacement about a rotation axis of the dipole mass system from a reference position;
- and
- tuning means with the dipole mass system for selectively varying the sensitivity to angular displacements with respect to the rotation axis of the dipole mass system to variations in gravity gradient, wherein the tuning means includes means for selectively varying the metacentric height of the dipole mass system.
A method for selectively tuning the sensitivity of a suspended dipole mass gravity gradiometer to respond to a gravity gradient to be measured including the step of:
- selectively varying the metacentric height of the suspended dipole mass gravity gradiometer.
A method for selectively tuning the sensitivity of a suspended dipole mass gravity gradiometer to respond to a gravity gradient to be measured including the step of:
- selectively varying the center of gravity of the dipole mass gravity gradiometer with respect to the metacenter of the dipole mass gravity gradiometer.
Dependencies are inferred from the claim text.