Patent ID: 9632208
Date: 2017-04-25
CPC Classifications: G01V

Claim:
1. A rotational gravity gradiometer comprising: a first member, a second member, a drive member and a motor; the first member disposed above the second member orthogonal to and centered with respect to the second member; the first member comprising a first pair of support arms extending axially from a center of the first member; the second member comprising a second pair of support arms extending axially from a center point of the second member; a mass unit is attached to opposite ends of each support arm at a distal end of the respective first member and second member; a first sensor element attached between each mass unit of the first member and a connection point of the second member for sensing movement of the mass unit; and a second sensor element attached between each mass unit of the second member and the drive member; and the drive member coupled to the motor to drive the first member and the second member rotationally; wherein the respective first and second sensor elements generate a signal in response to deflection of the support arms induced by an external mass.