Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2006-07-11
2006-07-11
Lefkowitz, Edward (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C324S326000
Reexamination Certificate
active
07075304
ABSTRACT:
A pulse inductive metal detector that includes a variable resistor for controlling coil characteristics for both transmitter and receiver modes of operation. A coil coupled with an electronic switch is charged with current from the power source in a transmitter mode such that when the electronic switch is abruptly switched closed the coil emits a magnetic field that induces eddy currents in a metal target. Once the transmitter magnetic fields have decayed enough, the coil can be operated in a receiver mode to detect a magnetic field resulting from eddy currents in the metal target. The variable resistor is coupled across the coil for varying the resistance across the coil to optimize the pulse inductive metal detector sensitivity to the metal target.
REFERENCES:
patent: 4638262 (1987-01-01), Miyamoto
patent: 5512878 (1996-04-01), Balch et al.
patent: 6326790 (2001-12-01), Ott et al.
patent: 6686742 (2004-02-01), Candy
patent: 2002/0180443 (2002-12-01), Fine et al.
Fasulo, II Albert J.
Lefkowitz Edward
The Johns Hopkins University
Whittington Kenneth J.
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