Measuring and testing – Gravitational determination
Patent
1981-02-17
1983-12-27
Gill, James J.
Measuring and testing
Gravitational determination
G01V 708
Patent
active
044223293
ABSTRACT:
A gravity meter is provided which has a support framework which supports a suspension system having a weight arm to which a reaction mass is attached. The reaction mass includes a dielectric mass which extends partially into a cavity between a pair of conductors. Changes in either the ambient gravitational field or the electric potential on the conductors causes the dielectric mass to be moved into or out of the cavity between the conductors allowing both fine tune calibration of the device by means of varying the electric potential and direct readout of the device by measuring the electric potential required to equilibrate the conductor and dielectric system. The suspension assembly includes a pair of parallel spindles rotatably mounted on hinges secured to the support framework with the spindles being interconnected by a zero length mainspring and temperature compensating framework. The weight arm is attached to a first one of the spindles and the second spindle is connected to a mechanical adjustment assembly for gross tune adjustment of the tensioning mechanism to calibrate the gravity meter to a pre-selected gravity range prior to fine tuning the gravity meter by means of varying the potential on the conductors.
REFERENCES:
patent: 2316915 (1943-04-01), Truman
patent: 2322681 (1943-06-01), Zenor
patent: 2732718 (1956-01-01), Cornelison
patent: 2738676 (1956-03-01), Worden et al.
patent: 3245263 (1966-04-01), Cornelison
patent: 3713088 (1973-01-01), Lehner et al.
"A New Gravimeter . . . " by Hedstrom, from Technical Publication 953, American Inst. of Mining & Metallurgical Engrs., 1938.
"Worden Gravity Meter Operating Instructions" by Texas Instruments, Jan. 1978.
"Geodetic Gravity Meter Model `G`", La Coste +Romberg, 1956.
"Table-Synopsis of Capacitive Displacement Transducers" from Instruments & Control Systems, vol. 37, p. 80, Nov. 1964.
Pelegrin Karl
Richards Christopher
Delta-G Instruments, Inc.
Gill James J.
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