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Title: 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:
 [1];  [2]
  1. (Livermore, CA)
  2. (Walnut Creek, CA)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
874924
Patent Number(s):
US 6489772
Assignee:
The Regents of the University of California (Oakland, CA) LLNL
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. doi:. 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}
}

Patent:

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