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Composition including an item and an encoded optical substrate and a method for identifying an item

  • US 8,498,052 B2
  • Filed: 09/14/2009
  • Issued: 07/30/2013
  • Est. Priority Date: 08/20/2002
  • Status: Active Grant
First Claim
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1. A method of identifying a dispersive substance, comprising:

  • (a) providing an item comprising the dispersive substance and an optical substrate removably attached to the dispersive substance, at least a portion of the optical substrate having a diffraction grating embedded therein or thereon, the diffraction grating having a resultant refractive index variation at a grating location indicative of a code;

    (b) removing the optical substrate from the dispersive substance;

    (c) illuminating the optical substrate with incident light after the removing, the diffraction grating providing an output light signal indicative of the code;

    (d) reading the output light signal from the optical substrate after the optical substrate is removed from the dispersive substance, thereby detecting the code therefrom; and

    (e) identifying the dispersive substance from the detected code.

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