Coding and authentication by phase measurement modulation response and spectral emission
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United States of America Patent
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Aug 27, 2002
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N/A
app pub date -
Oct 11, 2000
filing date -
Oct 13, 1999
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Abstract
A method of coding and authentication includes the steps of irradiating a sample with a harmonically modulated radiation and detecting a component of an emission of the sample in response where the component is out of phase with the radiation. The method further includes modulating the intensity of the radiation and identifying the sample by a phase difference between the radiation and the out of phase component.
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