The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 2001
Filed:
Nov. 04, 1999
Carl Tyrén, Monaco, SE;
RSO Corporation N.V., Curacao, NL;
Abstract
A sensor for remote detection of objects (,), preferably for use in an article surveillance system, comprises a wireshaped element (,), which is arranged to be excited and detected electromagnetically. The wireshaped element (,) has a diameter less than 30 &mgr;m. The element is arranged to transmit an electromagnetic reply signal, the amplitude of which is modulated in response to an externally applied and time-varying magnetic field. According to a method of detecting the presence of an object (,) in a surveillance zone (,), the object is provided with at least one wireshaped element (,) of amorphous or nanocrystalline metal alloy with magnetic properties and with a diameter less than 30 &mgr;m. Electromagnetical signals are generated in the surveillance zone for exciting the wireshaped element. Furthermore, a time-varying magnetic modulating field is generated in the surveillance zone. Electromagnetic signals generated by the wireshaped element are received and analyzed with respect to a modulation in amplitude caused by the magnetic modulating field, so as to determine the presence of the element (and consequently the object) in the surveillance zone.