Borehole sensor

Details Borehole sensor Borehole sensor

1976-06-23

1977-05-03

Moskowitz, Nelson

Communications: electrical

Selective

Interrogation response

340 155BH, 33304, 33313, 175 45, 340 18NC, G01V 140, G01C 914, E21B 4722

Patent

active

040217744

ABSTRACT:
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 determine the deviation from desired positions about the axes and provide feedback to the motor drive system to eliminate the error.

REFERENCES:
patent: 3587175 (1971-06-01), Armistead
patent: 3587176 (1971-06-01), Schwerk
patent: 3771118 (1973-11-01), Lichte et al.
patent: 3791043 (1974-02-01), Russell
patent: 3896412 (1975-07-01), Rohr

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