Borehole induction coil transmitter

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874924

Holladay, Gale ^[1]; Wilt, Michael J ^[2]

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1. Livermore, CA
2. Walnut Creek, CA

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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: The Regents of the University of California (Oakland, CA)
• Patent Number(s): US 6489772
• OSTI ID: 874924
• Country of Publication: United States
• Language: English

Related Subjects

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
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