Apparatus for the detection of magnetic tags

Details Apparatus for the detection of magnetic tags Apparatus for the detection of magnetic tags

1991-01-08

1992-07-28

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Magnetometers

324253, 340573, G01R 33022, G01R 3304

Patent

active

051343703

ABSTRACT:
An apparatus detects a magnetic tag implanted in an organism as detector is moved past the organism by detecting a magnetic field difference between two positions. Prior to examination of a specimen under test, the outputs of a plurality of loops detecting magnetic fields are balanced in a uniform magnetic field. As a consequence, when one of the coils is exposed to a different magnetic field than the other of the coils this difference is detected and an alarm is sounded to indicate that the magnetic tag has been detected.

REFERENCES:
patent: 2958819 (1960-11-01), Bregar
patent: 3374787 (1968-03-01), Hatke
patent: 3528402 (1970-09-01), Abramowitz
patent: 4127813 (1978-11-01), Hiroshima et al.
patent: 4439732 (1984-03-01), Hesterman et al.
patent: 4625842 (1986-11-01), Bell et al.

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