Security element for the electronic surveillance of articles
This invention relates to a security element for the electronic surveillance of articles. The invention is directed to a security element for the electronic surveillance of articles. This security element is detected by surveillance systems operating in different frequency ranges and it includes at...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | This invention relates to a security element for the electronic surveillance of articles.
The invention is directed to a security element for the electronic surveillance of articles. This security element is detected by surveillance systems operating in different frequency ranges and it includes at least two materials of high permeability which, when excited by an external alternating magnetic field emit each a characteristic signal. The maximum signal components of the two materials lie in different frequency ranges and the signal components of the one material are negligibly ow in that particular frequency range in which the signal component of the other material is at a maximum level. The invention also relates to surveillance systems that incorporate these security elements. |
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