Method for near field electromagnetic proximity determination for guidance of a borehole drill
US5923170A · kind A · utility
247Cited by
4References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1998 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Mar 26, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.