Determining properties of magnetic elements

G - Physics – 06 – K

Patent

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G06K 7/08 (2006.01) G01N 27/72 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2381717

A method of determining differing characteristics of magnetic dipole elements such as orientation, coercivity, bias and response amplitude and a tag reader for reading magnetic tags containing such elements. The elements are scanned by a rotating magnetic field and two sets of transition data are determined. The transition data sets are associated with respective elements and analysed to determine mean field values resolved along the element vectors. These field values are used to determine properties of the elements, such as coercivity.

L'invention porte sur un procédé permettant de déterminer différentes caractéristiques d'éléments dipôles magnétiques tels que : orientation, coercitivité, polarisation et amplitude de réaction. Un lecteur d'étiquettes permet de lire les étiquettes magnétiques contenant ces éléments. Les éléments sont balayés par un champ magnétique rotatif et deux ensembles de données de transition sont déterminés. Ces ensembles de données de transition sont associés à des éléments respectifs et analysés afin de déterminer des valeurs de champ moyennes obtenues avec les vecteurs des éléments. Ces valeurs de champ sont utilisées pour déterminer des propriétés des éléments telles que la coercitivité.

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