Apparatuses and methods for making geophysical measurements useful in determining the deflection of the vertical
AssigneeChevron Research and Technology Company
InventorPeter Graebner
Life of this patent
Estimating the term…
Abstract
A non-magnetic apparatus is disclosed for finding the deflection of the vertical. That apparatus has a device for finding an instrument spatial angle between a reference direction and an instrument characterization direction, and a device for finding a deflection spatial angle between the instrument characterization direction and a direction along a plumb line. Preferably, the device for finding the instrument spatial angle uses a system of gyroscopes. Preferably, the device for finding the deflection spatial angle uses a pendulum.
Claims10
A non-magnetic apparatus comprising:
- (a) means for finding an instrument spatial angle between a reference direction and an instrument characterization direction, wherein the means for finding said instrument spatial angle comprises a gyroscope, and
- (b) means for finding a deflection spatial angle between said instrument characterization direction and a direction along a plumb line, wherein the means for finding a deflection spatial angle is attached to the means for finding an instrument spatial angle.
A method for determination of the deflection of the vertical comprising:
- (a) finding a reference spatial angle between the perpendicular to a reference spheroid and a reference direction;
- (b) finding an instrument spatial angle between said reference direction and an instrument characterization direction;
- (c) finding a deflection spatial angle between said instrument characterization direction and a direction along a plumb line;
- and
- (d) adding together said reference spatial angle, said instrument spatial angle, and said deflection spatial angle.
Dependencies are inferred from the claim text.