Magnetic interrogation techniques
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United States of America Patent
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Apr 9, 2002
Grant Date -
N/A
app pub date -
Jul 20, 1999
filing date -
Oct 9, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reader for interrogating a magnetic tag, e.g. for reading data stored in the tag, is described. The reader comprises a field generating device the magnetic field produced by which defines an interrogation zone, wherein said field generating device comprises: (a) means for generating a magnetic field: (b) a transmit coil for transmitting an interrogating electromagnetic signal into the interrogation zone so as to interact with a magnetic tag, when present in said interrogation zone; and (c) at least one receive coil for receiving an electromagnetic signal generated by a tag in response to said interrogating signal and the magnetic field produced by said magnetic field generating means. The field generating means can take the form of a pair of hollow cylinders, giving rise to a 'loop' reader, or it can be a flat magnet, giving rise to a 'side pass' reader.
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