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OwnerWil Ophey, Sjoerd Stallinga +3inventors
InventorsWil Ophey, Sjoerd Stallinga, Pim Theo Tuyls, Antonius Hermanus Maria Akkermans, Boris Skoric
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An optical identifier (1) can be used as a Physical Unclonable Function for producing a speckle pattern, as a response, upon being challenged with a light beam, as a challenge. This property can be used for identification of the optical identifier or of an object attached thereto, for the authentication of an information carrier or for generation of transaction keys. Since the response obtained in response to given challenge is highly sensitive to the relative position of the optical identifier, light beam source and detector for the speckle pattern, this relative position has to be accurately adjusted to reliably obtain the same response to a given challenge. To this aim, an optical identifier is proposed having an alignment area (3) for splitting an incident beam into distinct beams (6, 7) which can be detected as alignment signals (10a, 10b, 10c, 10d) on a detector (8) and used for the monitoring and for the adjustment of said relative position.
Optical identifier (1) comprising at least one alignment area (3) of a predetermined spatial structure capable of producing at least three separate beams (6, 7) in response to an incident irradiation beam (4), the orientation of said beams (6, 7) being indicative of a position and/or orientation of said optical identifier (1) relative to a reference position and/or orientation within an optical system (5, 8, 12).
Apparatus (2) for positioning an optical identifier (1) comprising at least one alignment area (3) of a predetermined spatial structure capable of producing at least three separate beams (6, 7) in response to an incident irradiation beam (4), the orientation of said beams (6, 7) being indicative of a position and/or orientation of said optical identifier (1) relative to a reference position and/or orientation within the apparatus (2), wherein said apparatus (2) comprises:
Method for positioning an optical identifier (1) comprising at least one alignment area (3) of a predetermined spatial structure capable of producing at least three separate beams (6, 7) in response to an incident irradiation beam (4), the orientation of said beams (6, 7) being indicative of a position and/or orientation of said optical identifier (1) relative to a reference position and/or orientation within an optical system (5, 8, 12), wherein said method comprises the steps of:
Dependencies are inferred from the claim text.