Metal object detecting apparatus

Details Metal object detecting apparatus Metal object detecting apparatus

2007-06-13

2009-06-09

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C340S551000, C324S247000

Reexamination Certificate

active

07545140

ABSTRACT:
A metal object detecting apparatus comprising, a transmitter for generating a primary magnetic field having a resultant magnetic field direction which varies along any substantially linear path through a surveillance volume such that at three locations along said path the resultant magnetic field points in three mutually substantially orthogonal directions; a detector for measuring a secondary magnetic field at a plurality of positions as a function of time due to the presence of a metal object within the surveillance volume as it passes a plurality of measurement points there-through; and a processor for determining from the measured secondary magnetic fields a track through the surveillance volume comprising a plurality of locations of the metal object and a magnetic moment thereof at each location, the processor being adapted in use to derive there-from a magnetic signature that is characteristic of the metal object and independent of the orientation and track of the metal object.

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