Method for near field electromagnetic proximity determination for guidance of a borehole drill
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United States of America Patent
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Jul 13, 1999
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N/A
app pub date -
Mar 26, 1998
filing date -
Apr 4, 1997
priority date (Note) -
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Abstract
A method and apparatus for precise measurement of the distance and direction from a magnetic field sensor to a nearby magnetic field source includes an elongated iron core solenoid driven by a repetitive, nonsinusoidal current source. In the near field the solenoid has two spaced, temporally varying magnetic poles, and measurement of the distance and direction to this source includes analysis of field components which vary in synchronism with the current source.
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