Measuring and testing – Gravitational determination
Patent
1997-03-25
1998-03-31
Chapman, John E.
Measuring and testing
Gravitational determination
364420, G01V 716
Patent
active
057341044
ABSTRACT:
A gravity gradiometer capable of obtaining the vertical component T.sub.zz of the gravity gradient tensor out of the two horizontal components T.sub.xx and T.sub.yy based on Laplace equation: T.sub.zz =-(T.sub.xx +T.sub.yy) comprises a single disc, and two pairs of radially-oriented horizontal axis accelerometers oppositely-mounted on such disc along respective X and Y axes, each pair being capable of providing, respectively, T.sub.xx =T.sub.x1 -T.sub.x2 and T.sub.yy =T.sub.y1 -T.sub.y2 where T.sub.x1 and T.sub.x2 are the respective outputs of the X axis accelerometers and T.sub.y1 and T.sub.y2 are the respective outputs of the Y axis accelerometers. The gravity gradiometer is also capable of obtaining all five independent components of the gravity gradient tensor based on the above Laplace equation and tensor symmetry as follows: One of the above pairs of horizontal axis accelerometers further comprises tangentially oriented horizontal accelerometers capable of providing by subtraction the T.sub.xy component of the gravity gradient tensor, and an accelerometer module consisting of two horizontal accelerometers aligned with the radially and tangentially oriented combination is mounted at a location on the Z axis of the disc above or below the disc to provide the T.sub.zx and T.sub.zy components by subtracting the values of T.sub.x and T.sub.y, respectively, at that location from average values of T.sub.x and T.sub.y at the disc plane.
REFERENCES:
patent: 5339684 (1994-08-01), Jircitano et al.
patent: 5357802 (1994-10-01), Hofmeyer et al.
Geophysics, vol. 43, No. 1, Feb. 1978, Jordon, "Moving-Base Gravity Gradiometer Surveys and Interpretation", pp. 94-101.
Geophysics, vol. 58, No. 4, Apr. 1993, Jekeli, "A Review of Gravity Gradiometer Survey System Data Analyses", pp. 508-514.
Physical Review Letters, vol. 70, no. 9, Mar. 1993, Moody et al, "Gaiss's Law Test of Gravity at Short Range", pp. 1195-1198.
Bloom Leonard
Chapman John E.
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