Signature mark recognition systems

G - Physics – 01 – N

Patent

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Details

G01N 21/21 (2006.01) B42D 15/10 (2006.01) B44F 1/02 (2006.01) G07D 7/12 (2006.01) G07F 7/08 (2006.01)

Patent

CA 2280564

A signature recognition system for identifying an article with a distinctive diffractive element (or elements) and verifying the presence of that element or elements comprising; an article with one or more diffraction gratings impressed thereon, the gratings) exhibiting periodic wave surface profiles having a depth-to-pitch ratio .delta. of between 0.1 and 0.5, a source of polarised electromagnetic radiation of wavelength .lambda., such that the pitch G of the periodic wave surface profile of the grating(s) is comparable to an integer multiple n of that wavelength means for directing the source of polarised electromagnetic radiation to the surface of the grating(s) at a plane of incidence substantially normal to the plane of the surface of the diffraction grating and at an angle of approximately 45 ° azimuth to the alignment of the grooves on the surface, and means for detecting radiation reflected from the grating(s) surface which is oppositely polarised to the incident radiation.

Système de reconnaissance de signature pour identifier un article à l'aide d'un élément (ou d'éléments) ayant une diffraction distincte et pour vérifier la présence du ou desdits éléments, entre autres : un article avec une ou plusieurs mires à diffraction gaufrées dessus, les mires exhibant des profils de surface à onde périodique ayant un rapport profondeur-inclinaison.delta compris entre 0,1 et 0,5; une source de radiation électromagnétique polarisée d'une longueur d'onde lambda, de telle sorte que l'inclinaison G du profil de surface de l'onde périodique des mires est comparable à un multiple d'un nombre entier de cette longueur d'onde, des dispositifs pour diriger la source du rayonnement électromagnétique polarisé sur la surface des mires à un plan d'inclinaison essentiellement normal par rapport au plan de la surface de la mire à diffraction, et à un angle d'environ 45 degrés d'azimut par rapport à l'alignement des gorges sur la surface, ainsi que des dispositifs pour détecter le rayonnement réfléchi de la surface des mires, ladite surface étant polarisée à l'opposé du rayonnement incident.

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