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Coding and authentication by phase measurement modulation response and spectral emission

  • US 6,441,380 B1
  • Filed: 10/11/2000
  • Issued: 08/27/2002
  • Est. Priority Date: 10/13/1999
  • Status: Active Grant
First Claim
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1. A method of coding and authentication comprising the steps of:

  • irradiating a sample with a harmonically modulated radiation, the sample comprising at least one material that exhibits a relaxation rate to a first energy level when excited to a second energy level, where the radiation is harmonically modulated in relationship to the relaxation rate; and

    detecting a component of an emission of said sample in response to said irradiating wherein said component is out of phase with said radiation, and where the detected component is expressive of encoded information.

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