Coding and authentication by phase measurement modulation response and spectral emission
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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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.
71 Citations
23 Claims
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1. A method of coding and authentication comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for detecting spectral emission comprising:
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a source for 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
a detector for 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. - View Dependent Claims (9, 10, 11, 12)
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13. A method of coding and authentication comprising the steps of:
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irradiating a sample with a harmonically modulated radiation, the sample comprising materials that exhibit characteristic relaxation rates to a first energy level when excited to a second energy level, where the radiation is harmonically modulated in relationship to the relaxation rates; and
detecting a plurality of components of an emission of said sample, wherein said plurality of components are related to said relaxation rates of said materials that comprise said sample and encode information. - View Dependent Claims (14)
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15. A method for encoding information, comprising:
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providing an object with a plurality of light emissive materials selected for encoding information based on a characteristic relaxation rate of each of the plurality of materials, the relaxation rate being to a first energy level when excited to a second energy level;
illuminating the plurality of materials with light that is harmonically modulated in relationship to the relaxation rates;
detecting emitted light from the plurality materials and determining phase differences in the emitted light relative to the harmonically modulated light; and
decoding the encoded information using the determined phase differences. - View Dependent Claims (16)
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17. Apparatus for reading encoding information, comprising:
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an optical source for illuminating an object with harmonically modulated light, the object being provided with a plurality of light emissive materials selected for encoding information based on a characteristic relaxation rate of the materials, the relaxation rate being to a first energy level when excited to a second energy level, the light being harmonically modulated in relationship to the relaxation rates;
a detector for detecting emitted light from the material and for determining phase differences between the emitted light and the harmonically modulated light; and
a decoder coupled to said detector for decoding the encoded information using the determined phase differences. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification