Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2011-03-08
2011-03-08
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Magnetic
Displacement
C324S207150
Reexamination Certificate
active
07902817
ABSTRACT:
Provided is an electromagnetic tracking system, comprising a coil arrangement comprising a first coil configured to generate a first magnetic field and a second coil configured to generate a second magnetic field and a drive unit configured to provide a first drive current to the first coil and to provide a second drive current to the second coil, wherein the first drive current and the second drive current are at about the same frequency, wherein the frequency is below 60 Hz, and wherein the first electromagnetic field and the second magnetic field are generated out of phase. Also provided is a method of electromagnetic tracking comprising generating a first electromagnetic field at a frequency, generating a second electromagnetic field at about the frequency, wherein the frequency is below 60 Hz and wherein the first electromagnetic field and the second magnetic field are generated out of phase, sensing the first electromagnetic field and the second electromagnetic field and processing a waveform indicative of a combination of the sensed first electromagnetic field and the sensed second electromagnetic field.
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Fletcher Yoder P.C.
General Electric Company
Ledynh Bot L
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