Stepped gravity gradiometer

Details Stepped gravity gradiometer Stepped gravity gradiometer

1987-11-27

1994-08-30

Lobo, Ian J.

Measuring and testing

Gravitational determination

G01V 702

Patent

active

053416813

ABSTRACT:
A gravity gradiometer instrument alternately and sequentially rotatable in opposing angular increments provides a measure of the gravity gradient in-line and cross components without requiring real-time generation of trigonometric harmonic components, continuous demodulation to separate the component data signals, or filtering. Demodulation of the output data is accomplished by simple summing of the data from successive angular positions of radially opposing accelerometers. Precise control of the rotational speed is not required. Further, the accelerometer complement is minimal and because the direction of rotation is periodically reversed, a twist capsule is used rather than slip rings, thereby avoiding the noise and maintenance problems associated therewith.

REFERENCES:
patent: 3630086 (1971-12-01), Wilk
patent: 3731537 (1973-05-01), Tragerer
Metzger, E. H., "Recent Gravity Gradiometer Developments," AIAA vol. 77-1081 (306-315), Aug. 8-9, 1977.

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