Secure tag reader
First Claim
1. A reader for a secure tag, the reader comprising a first excitation source that stimulates at least one transition;
- and a second excitation source that stimulates more transitions than the first excitation source; and
a detector for detecting luminescence from the secure tag in response to excitation from the first excitation source and in response to excitation. from the second excitation source to ensure that luminescence is detected at a pre-determined wavelength in response to the second excitation source but not the first excitation source.
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Abstract
A reader for a secure tag. The reader comprises a first excitation source (such as one or more LEDs) that stimulates at least one transition in the secure tag. The reader also comprises a second excitation source that stimulates more transitions than were stimulated by the first excitation source. The reader has a detector for detecting luminescence from the secure tag in response to excitation from the first excitation source and in response to excitation from the second excitation source to ensure that luminescence is detected at a pre-determined wavelength in response to the second excitation source but not the first excitation source.
26 Citations
12 Claims
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1. A reader for a secure tag, the reader comprising a first excitation source that stimulates at least one transition;
- and a second excitation source that stimulates more transitions than the first excitation source; and
a detector for detecting luminescence from the secure tag in response to excitation from the first excitation source and in response to excitation. from the second excitation source to ensure that luminescence is detected at a pre-determined wavelength in response to the second excitation source but not the first excitation source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and a second excitation source that stimulates more transitions than the first excitation source; and
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11. A reader for a secure tag, the reader comprising (i) a first excitation supply that stimulates at least one luminescence peak from the secure tag, and (ii) a second excitation supply that stimulates more luminescence peaks from the secure tag than the first excitation supply.
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12. A method of authenticating a secure tag comprising:
- exciting the secure tag at a first wavelength to stimulate a plurality of transitions;
detecting luminescence from the secure tag in response to the first wavelength excitation;
exciting the secure tag at a second wavelength, lower than the first wavelength, to stimulate more transitions than for the excitation at the first excitation;
detecting luminescence from the secure tag in response to the second wavelength excitation;
comparing luminescence at a pre-determined wavelength resulting from the first wavelength excitation with luminescence at the pre-determined wavelength resulting from the second wavelength excitation;
authenticating the secure tag in the event that the second wavelength excitation stimulates luminescence at the pre-determined wavelength and the first wavelength excitation does not stimulate luminescence at the pre-determined wavelength.
- exciting the secure tag at a first wavelength to stimulate a plurality of transitions;
Specification