Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate
2005-03-10
2009-02-10
Patidar, Jay M (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
Reexamination Certificate
active
07489134
ABSTRACT:
A magnetic sensing assembly for measuring magnetic field produced by a time varying electric current generated in geological formations is disclosed. The assembly comprises a soft magnetic core, a sensing coil wound on the core, and at least one miniature low noise magnetic field sensor disposed near an edge of the magnetic core. Due to strong magnetic flux concentration effect of the magnetic core the sensor facilitates very low noise magnetic measurements at a low rate of change of the magnetic field, while the sensing coil offers high sensitivity and low noise measurement at higher rates. The magnetic sensing assembly preferably comprises an earth field cancellation element. The assembly also includes an acquisition means synchronized with an electromagnetic transmitter to receive and process signals from sensing coil and from magnetic field sensor.
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