MAGNETIC SENSING APPARATUS, SYSTEMS, AND METHODS
First Claim
1. A processor-implemented method, comprising:
- acquiring a first signal from a first magnetometer at least partially disposed within a Helmholtz coil;
acquiring a second signal from a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer;
processing the second signal to determine a drive signal;
driving the Helmholtz coil using the drive signal so as to substantially null an ambient Earth magnetic field surrounding the first magnetometer; and
processing the first signal as one of a down hole location signal or a down hole telemetry signal, the location signal to determine a range to a sub-surface object, and the telemetry signal to provide data from down hole drilling operations.
1 Assignment
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Accused Products
Abstract
In some embodiments, an apparatus and a system, as well as a method and an article, may operate to acquire a first signal from a first magnetometer at least partially disposed within a Helmholtz coil, to acquire a second signal from a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer, to process the second signal to determine a N drive signal, to drive the Helmholtz coil using the drive signal so as to null an ambient Earth magnetic field surrounding the first magnetometer, and to process the first signal as one of a down hole location signal or a down hole telemetry signal, the location signal to determine a range to a sub-surface object, and the telemetry signal to provide data from down hole drilling operations. Additional apparatus, systems, and methods are disclosed.
6 Citations
21 Claims
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1. A processor-implemented method, comprising:
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acquiring a first signal from a first magnetometer at least partially disposed within a Helmholtz coil; acquiring a second signal from a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer; processing the second signal to determine a drive signal; driving the Helmholtz coil using the drive signal so as to substantially null an ambient Earth magnetic field surrounding the first magnetometer; and processing the first signal as one of a down hole location signal or a down hole telemetry signal, the location signal to determine a range to a sub-surface object, and the telemetry signal to provide data from down hole drilling operations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a first magnetometer at least partially disposed within a Helmholtz coil; a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer; and a signal processor configured to drive the Helmholtz coil according to a signal provided by the second magnetometer so as to substantially null an ambient Earth magnetic field surrounding the first magnetometer, and to receive a down hole location signal or a down hole telemetry signal from the first magnetometer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system, comprising:
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a down hole tool housing; and an apparatus attached to the housing, the apparatus comprising a first magnetometer at least partially disposed within a Helmholtz coil, a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer, and a signal processor configured to drive the Helmholtz coil according to a signal provided by the second magnetometer so as to substantially null an ambient Earth magnetic field surrounding the first magnetometer, and to receive a down hole location signal or a down hole telemetry signal from the first magnetometer. - View Dependent Claims (19, 20, 21)
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Specification