Apparatus and method for detecting magnetic electronic article s

Details Apparatus and method for detecting magnetic electronic article s Apparatus and method for detecting magnetic electronic article s

1992-09-03

1994-04-19

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

053049829

ABSTRACT:
A dual frequency field is generated to produce an interrogation zone wherein the higher frequency is substantially higher than the lower frequency. The signal generated by the magnetic marker is detected, filtered and amplified. Time windows are selected at the expected pulse locations of a signal. The signals detected at the time windows are multiplied by a window function. The product resulting therefrom is averaged to produce a demodulated signal and the presence of a marker in the interrogation zone is determined by detecting the demodulated signal at the lower frequency of the dual frequency interrogation zone.

REFERENCES:
patent: 3990065 (1976-11-01), Purinton et al.
patent: 4356477 (1982-10-01), Vandebult
patent: 4710752 (1987-12-01), Cordery
patent: 5005001 (1991-04-01), Cordery
patent: 5023598 (1991-06-01), Zemlok et al.

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