Selector for AC magnetic inductive field receiver coils

Details Selector for AC magnetic inductive field receiver coils Selector for AC magnetic inductive field receiver coils

1985-09-17

1987-03-03

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

046479104

ABSTRACT:
An inductive magnetic field article surveillance system includes a generator for a first magnetic field. Articles to be monitored include a structure responsive to the first magnetic field for deriving a second inductive magnetic field having a predetermined frequency. An inductive magnetic field receiver responsive to the second magnetic field includes a receiver coil arrangement for deriving a signal that is a replica of variations of the second magnetic field. Processing circuitry responds to the receiver coil arrangement to derive an indication of the presence of the structure. The receiver coil arrangement includes first and second coils likely to have different responses to the second magnetic field. Only one of the first and second coils is connected to the processing circuitry at a time, as a function of which coil is supplying a signal at the predetermined frequency of the second field to the processing circuitry for at least a predetermined time interval.

REFERENCES:
patent: 4251808 (1981-02-01), Lichtblau
patent: 4260990 (1981-04-01), Lichtblau
patent: 4539558 (1985-09-01), Fearon

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