Patent ID: 8201448
Filing Date: 2012-06-19
Classification: G01V

Abstract:
1. A quadrupole responder for an OQR-type gravity gradiometer comprising: (a) a housing; (b) a mass quadrupole positioned within the housing, said mass quadrupole having a pair of opposing quadrupole faces and a center of mass between said opposing quadrupole faces; (c) at least a pair of torsion spring flexures provided by pins connecting said opposing quadrupole faces of said mass quadrupole to the housing, said torsion spring flexures providing an axis of rotation which passes through the center of mass of said mass quadrupole and through both spring flexures; and, (d) a pair of bosses, each boss being integral with and coaxial with one of the pins, and each boss being located outwardly of one of the pins; wherein said pins are integral with said mass quadrupole; and further, wherein said housing has two halves, each half containing at least one V-shaped notch, said V- shaped notches from each half of the housing together forming a clamp around one of the bosses, said one of the bosses being diffusion bonded to said housing at said notches.