Apparatus and method for detecting a magnetic marker

Details Apparatus and method for detecting a magnetic marker Apparatus and method for detecting a magnetic marker

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 1266900

APPARATUS AND METHOD OF DETECTING A MAGNETIC MARKER Abstract of the Disclosure This invention relates to an apparatus and method for detecting the presence of a magnetic marker in an interrogation zone. A dual frequency magnetic field is generated causing a magnetic marker to produce amplitude modulated side band signals at harmonics of the higher frequency field. These side band signals are readily distinguishable from amplitude noise.

544016

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