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

1986-08-08

1987-12-01

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

047107529

ABSTRACT:
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.

REFERENCES:
patent: 3747086 (1973-07-01), Peterson
patent: 4139844 (1979-02-01), Reeder

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