Method and apparatus for determining the magnitude of a field in the presence of an interfering field in an EAS system
US5189397A · kind A · utility
16Cited by
1References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1992 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Jan 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2471
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.