Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-01-09
1993-02-23
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, G08B 1324
Patent
active
051893975
ABSTRACT:
A method and apparatus for determining the amplitude of a first magnetic field at a first fundamental frequency in a zone in which a second magnetic field is able to be present wherein first and second transmissions of a magnetic field at the fundamental frequency and different phases is carried out at different times, the field in the zone is detected for each transmission and the detected fields are processed to determine the magnitude of the first magnetic field.
REFERENCES:
patent: 4859991 (1989-08-01), Watkins et al.
Roberson David L.
Watkins Harry E.
Sensormatic Electronics Corporation
Swann III Glen R.
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