Method for minimizing false alarms and electronic noise in elect

Details Method for minimizing false alarms and electronic noise in elect Method for minimizing false alarms and electronic noise in elect

1985-10-31

1987-09-29

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307100, 340501, 340572, 439514, G08B 1324

Patent

active

046971700

ABSTRACT:
A method for minimizing false alarms and background electronic noise in an electronic article surveillance system operated in the vicinity of substantially closed electrical loops such as formed by metal door and window frames. If the conductance of such loops is variable, electric currents induced in such loops by electromagnetic fields produced by the system have been found to be discontinuous, and can both produce a false alarm and raise the background noise level. The method comprises connecting metal straps across all joints in such loops to ensure permanent, reliable electrical connections at all such joints, thus providing greatly reduced variations in conductance around the loop.

REFERENCES:
patent: 1137489 (1915-04-01), Jellinek
patent: 3270124 (1966-08-01), Rawls et al.
patent: 3665449 (1972-05-01), Elder et al.
patent: 4135183 (1979-01-01), Heltemes

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