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G01V 7/06 (2006.01) G01V 7/00 (2006.01) G01V 7/08 (2006.01)
Patent
CA 1321482
-60- ABSTRACT OF THE DISCLOSURE A three-axis gravity gradiometer including three component gravity gradiometers arranged in mutually orthogonal directions, wherein each component gradiometer includes a pair of accelerometers each defining a sensitive axis. Each accelerometer includes a generally cylindrical proof mass made of a superconducting material. Each proof mass includes annular upper and lower hollowed out portions longitudinally surrounded by a generally cylindrical exterior wall. Common mode and differential mode sensing coils are arranged adjacent a bottom-side surface of a portion of the proof mass in one hollowed out annular portion and a levitation coil is arranged adjacent a bottom-side surface of the proof mass in the other hollowed out annular portion. The common mode, differential mode and levitation coils are connected in respective first, second and third superconducting circuits. The first circuit produces common mode signals indicative of forces acting on both accelerometers in the same direction. The second circuit produces differential mode signals indicative of forces acting on the accelerometers in different directions. The third circuit produces a force on each proof mass by which the proof masses are levitated. In addition, a superconducting negative spring coil is -61- wound on the periphery of the coil form. A persistent current is stored in each negative spring loop to cancel the rigidity of the mechanical spring. Also provided are superconducting circuits for common mode and differential mode force rebalance, residual sensitive axis angular misalignment compensation, and differential proof mass levitation at start-up. Either piezoelectric crystal transducers or persistent current loops are used to obtain residual sensitive axis linear misalignment compensation. 80/rac/sjh
584577
Swabey Ogilvy Renault
University Of Maryland College Park
LandOfFree
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