Borehole sensor with motor driven direction-sensing gimbals

Details Borehole sensor with motor driven direction-sensing gimbals Borehole sensor with motor driven direction-sensing gimbals

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G01V 3/08 (2006.01) G01C 9/00 (2006.01) G01V 3/18 (2006.01) E21B 47/022 (2006.01) E21B 47/12 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1065597

A borehole sensor is presented including a three axis gimbal device for determining (1) a vertical plane, using the force of gravity as a reference, (2) a horizontal plane, using the force of gravity as a reference, and (3) the north direction, using the earth's magnetic field as a reference. A motor drive system drives parts of the mechanism to desired positions about the three axes, and error transducers deter- mine the deviation from desired positions about the axes and provide feedback to the motor drive system to eliminate the error.

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