Gravity gradiometer with flexural pivot bearing

Details Gravity gradiometer with flexural pivot bearing Gravity gradiometer with flexural pivot bearing

1995-01-03

1997-09-16

Williams, Hezron E.

Measuring and testing

Gravitational determination

G01V 702

Patent

active

056683154

ABSTRACT:
A gravity gradiometer for measuring off-diagonal components of the gravitational gradient tensor includes a housing having a pair of electromagnetic shield enclosures (22, 23) arranged one inside the other, and a body (25) including superconducting material mounted within the inner enclosure (23) for fine pivotal flexure about an axis passing substantially through the centre of mass of the aforesaid body. An array of superconducting coils (30) is supported by the outer enclosure (22) and positioned in close proximity to the aforesaid body (25) for diamagnetically applying a rotational force to the body with respect to the axis of flexure and/or for responding by modulation of inductance to pivotal flexure of the body arising from a gravitational gradient across the body. The array is arranged to apply the rotational force in both rotational directions and to respond to flexure in either rotational direction. Also disclosed is a flexural pivot bearing which includes a pair of members (28, 31) with opposed close-spaced faces. These faces are joined by a web (29), of microscopic thickness, in a plane intersecting the faces. The members and the web are formed of an integral body of substantially uniform material, and the members are adapted for pivoted mutual flexure about a pivot axis aligned along said web.

REFERENCES:
patent: 3052127 (1962-09-01), De Mott
patent: 3564921 (1971-02-01), Bell
patent: 4841772 (1989-06-01), Paik
Parke, J.W. et al. "Sensitivity Enhancement of Inertial Instruments by Means of Superconducting Spring" Aug. 31, 1984.
Chan, H.A. et al "Superconducting Techniques for Gravity Survey and Inertial Navigation" Sep. 1984.
De Bra, D.B., "A Proposed Lunar Orbiting Gravity Gradiometer Experiment" Apr. 1972.
Chan, H.A. et al., "Superconducting Gravity Gradiometer for Sensitive Gravity Measurements", Jun. 15, 1987, pp. 3572-3597.

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