Method and apparatus for determining the magnitude of a field in

Details Method and apparatus for determining the magnitude of a field in Method and apparatus for determining the magnitude of a field in

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.

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