G - Physics – 08 – B
Patent
G - Physics
08
B
324/48, 340/124.
G08B 13/24 (2006.01)
Patent
CA 1272774
Title: An electromagnetic detection system, as well as a responder for such a system Abstract of the disclosure An electromagnetic detection system comprising transmission means producing in at least one first spatial detection zone an electromagnetic interrogation field; plurality of responders having attachment means for attachment to articles to be protected, each including a resonant circuit and if present in a detection zone, in response to the interrogation field, producing a signal; and first detection means adapted to detect a responder and, on detection of a responder, to produce a warning signal. According to the invention, the respond- ers are designed in such a manner that when the attachment means are removed or when a responder is damaged, at least one frequency determining parameter of the responder is changed in a predetermined manner. At least one second spatial detection zone is provided wherein respond- ers with the at least one changed frequency determining parameter can be detected.
511223
Hogen Esch Johannes H.l.
Macrae & Co.
N. V. Nederlandsche Apparatenfabriek Nedap
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