Rotation sensor for borehole telemetry

Details Rotation sensor for borehole telemetry Rotation sensor for borehole telemetry

1975-05-12

1977-03-22

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

33362, 73518, 324 43R, 324173, 340197, G01R 3304

Patent

active

040139450

ABSTRACT:
A rotation sensor and output signal processing apparatus is presented. The rotation sensor is a ring core flux gate magnetometer whose output varies as a function of the earth's magnetic field. The phase angle of the second harmonic of the magnetometer output is sensed to provide an indication of the state of rotation of the magnetometer. When a state of no rotation is sensed, actuating signals are delivered to a control system to sense borehole parameters and telemeter the parameters to the top of the borehole.

REFERENCES:
patent: 2822515 (1958-02-01), Klasse
patent: 3297948 (1967-01-01), Kohler
patent: 3316768 (1967-05-01), Cook
patent: 3400327 (1968-09-01), Sexton et al.
patent: 3835375 (1974-09-01), Rovner

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