Borehole induction coil transmitter
Abstract
A borehole induction coil transmitter which is a part of a cross-borehole electromagnetic field system that is used for underground imaging applications. The transmitter consists of four major parts: 1) a wound ferrite or mu-metal core, 2) an array of tuning capacitors, 3) a current driver circuit board, and 4) a flux monitor. The core is wound with several hundred turns of wire and connected in series with the capacitor array, to produce a tuned coil. This tuned coil uses internal circuitry to generate sinusoidal signals that are transmitted through the earth to a receiver coil in another borehole. The transmitter can operate at frequencies from 1-200 kHz and supplies sufficient power to permit the field system to operate in boreholes separated by up to 400 meters.
- Inventors:
-
- Livermore, CA
- Walnut Creek, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 874924
- Patent Number(s):
- 6489772
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- borehole; induction; coil; transmitter; cross-borehole; electromagnetic; field; underground; imaging; applications; consists; major; wound; ferrite; mu-metal; core; array; tuning; capacitors; current; driver; circuit; board; flux; monitor; hundred; wire; connected; series; capacitor; produce; tuned; internal; circuitry; generate; sinusoidal; signals; transmitted; earth; receiver; operate; frequencies; 1-200; khz; supplies; sufficient; power; permit; boreholes; separated; 400; meters; magnetic field; induction coil; imaging applications; /324/
Citation Formats
Holladay, Gale, and Wilt, Michael J. Borehole induction coil transmitter. United States: N. p., 2002.
Web.
Holladay, Gale, & Wilt, Michael J. Borehole induction coil transmitter. United States.
Holladay, Gale, and Wilt, Michael J. Tue .
"Borehole induction coil transmitter". United States. https://www.osti.gov/servlets/purl/874924.
@article{osti_874924,
title = {Borehole induction coil transmitter},
author = {Holladay, Gale and Wilt, Michael J},
abstractNote = {A borehole induction coil transmitter which is a part of a cross-borehole electromagnetic field system that is used for underground imaging applications. The transmitter consists of four major parts: 1) a wound ferrite or mu-metal core, 2) an array of tuning capacitors, 3) a current driver circuit board, and 4) a flux monitor. The core is wound with several hundred turns of wire and connected in series with the capacitor array, to produce a tuned coil. This tuned coil uses internal circuitry to generate sinusoidal signals that are transmitted through the earth to a receiver coil in another borehole. The transmitter can operate at frequencies from 1-200 kHz and supplies sufficient power to permit the field system to operate in boreholes separated by up to 400 meters.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2002},
month = {Tue Jan 01 00:00:00 EST 2002}
}