Multi-dimensional electronic identification of articles

G - Physics – 06 – K

Patent

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G06K 7/00 (2006.01) G06K 19/07 (2006.01)

Patent

CA 2321674

An identification system is provided for identifying a plurality of randomly aligned object-based transponders (18, 20, 22) passing through a predetermined reading volume. A reader (10) includes multiple transmitting and receiving antenna arrays (12, 14, 16) which are arranged sequentially to transmit interrogating and energising fields (29) into the reading volume, with each energising field having a different polarisation. Each transponder (12, 14, 16) is arranged to be powered by at least one of the interrogating and energising fields, and includes a short term memory module (30) which is arranged to record the successful transmission or otherwise of the identification signal of the transponder (20) and to retain the record in the absence of a power supply to the transponder. The short term memory module has a retention time longer than any predicted interruption of power supply to the transponder via one of the energising fields within the reading volume. The minimum memory retention time is typically the time period taken for the sequential transmission of all but one of the interrogating and energising fields (29) during an interrogation cycle.

L'invention concerne un système d'identification permettant d'identifier une pluralité de transpondeurs (18, 20, 22) basés objet, alignés au hasard, traversant un volume de lecture prédéterminé. Un lecteur (10) comprend plusieurs ensembles d'antennes (12, 14, 16) d'émission et de réception, séquentiellement organisées de manière à transmettre des champs (29) d'interrogation et de mise sous tension dans le volume de lecture, chaque champ de mise sous tension possédant une polarisation différente. Chaque transpondeur (12, 14, 16) est conçu de façon à être alimenté par au moins l'un des champs d'interrogation et de mise sous tension, et comprend un module de mémoire (30) à court terme conçu de manière à enregistrer l'émission fructueuse ou autre du signal d'identification du transpondeur (20) et à conserver l'enregistrement en l'absence de fourniture d'énergie au transpondeur. Le module de mémoire à court terme présente un temps de rétention plus long qu'une interruption prévue quelconque de fourniture d'alimentation au transpondeur via l'un des champs de mise sous tension dans le volume de lecture. Le temps de rétention de mémoire minimum est typiquement la période utilisée pour la transmission séquentielle de tous les champs (29) d'interrogation et de mise sous tension, à l'exception d'un, au cours d'un cycle d'interrogation.

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