Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-09-12
2006-09-12
Nguyen, Hung (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S552000, C340S561000, C340S568100, C340S686100, C340S870030, C340S870030, C324S323000, C324S326000, C324S329000
Reexamination Certificate
active
07106194
ABSTRACT:
A method for identifying a buried metal object using a three-dimensional steerable magnetic field (3DSMF) system. The method comprises generating a magnetic field vector (MFV) at a first MFV position above the buried metal object; measuring a time decay response at the first MFV position; generating a MFV at a next MFV position above the buried metal object; measuring a time decay response at the next MFV position; repeating the above steps until a complete 360-degree measurement of time decay responses of the buried metal object is completed; processing all measured time decay responses with a target search algorithm to determine a magnetic polarizability tensor of the buried metal object; and identifying the buried metal object by matching the magnetic polarizability tensor of the buried metal object to a known magnetic polarizability tensor of an object.
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Cooch Francis A.
Nguyen Hung
The Johns Hopkins University
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