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:
Jul. 09, 2002
Filed:
Mar. 17, 2001
Carl Tyrén, Parc Saint Roman, MC;
RSO Corporation N.V., Curacao, AN;
Abstract
A method for remote detection of objects, each object is provided with a sensor comprising at least two magnetic elements arranged in a predetermined mutual relationship representing an identity of the sensor. Electromagnetic signals are generated for exciting the sensor elements to produce electromagnetic reply signals. An amplitude of the electromagnetic reply signal from each sensor element is modulated by a first magnetic field having a magnitude-variant and a magnitude-invariant component. A second magnetic field is generated with rotating field vector. A frequency shift is detected in a component of the reply signal, when a magnitude-invariant component of the second magnetic field balances the magnitude-invariant component of the first magnetic field, wherein the respective sensor element is momentarily exposed to a resulting magnetic field with essentially no magnitude-invariant component. An orientation of the respective sensor element is determined from the orientation of the magnitude-invariant component of the second magnetic field, when the frequency shift occurs.