Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-07-02
1992-06-23
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340572, 342 44, H04B 700
Patent
active
051246996
ABSTRACT:
An electromagnetic detection and identification system for detecting and identifying a plurality of responders (improved transponders), each containing a unique code, and simultaneously present in one and the same interrogation field generated by a transmitter/receiver. According to the invention, the transmitter/receiver is arranged to adjust the frequency of the interrogation field periodically to one of a predetermined number of predetermined values, and each responder is arranged to detect the instantaneous frequency of the interrogation field, the arrangement being such that, in a number of selection cycles, each time a number of responders temporarily deactivate themselves in dependence upon the instantaneous frequency until one single responder remains which an generate the appurtenant code without becoming deactivated until the responder has been identified by the transmitter/receiver, whereafter the responder concerned is blocked by a change in field frequency, and the temporarily deactivated responders are reactivated, and the selection procedure is repeated until all responders in the interrogation field have been identified and blocked.
REFERENCES:
patent: 4459474 (1984-07-01), Walton
patent: 4471345 (1984-09-01), Barrett, Jr.
patent: 4614945 (1986-09-01), Brunius et al.
patent: 4691202 (1987-09-01), Denne et al.
patent: 4799059 (1989-01-01), Grindahl et al.
patent: 4862160 (1989-08-01), Ekchian et al.
Scholten Arjan H.
Stekelenburg Jan C.
Tervoert Marius L.
Venema Willem H. J.
Magistre Dervis
N.V. Netherlandsche Apparatenfabriek Nedap
Yusko Donald J.
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