Laser verification and authentication raman spectrometer (LVARS) detecting the stokes and/or anti-stokes emission
First Claim
1. A method to analyze media for composition and authentication of a source of unknown media comprising the steps of:
- exposing a sample of unknown media simultaneously to multiple wavelengths from multiple laser sources;
reading a Raman spectra of the sample of the unknown media through a variety of detectors each with a specific wavelength detection region using Raman spectroscopy, wherein the Raman spectra comprises at least one Stokes component and/or at least one Anti-Stokes component; and
manipulating mathematically at least one of the Stokes component and/or at least one of the Anti-Stokes component.
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Accused Products
Abstract
The LVARS is a fully instrumental, non-destructive spectroscopic device for the analysis and verification and authentication of the optical and electromagnetic properties (OEMP) of the inks, dyes, thin films, plastics, toners, paper, fixatives, paints, and printing agents used in documents and financial instruments. The instrument is quantitative in nature so as to correlate compositional data (elemental, isotopic, structure) with Raman optical spectra. The LVARS design consists of a computer-controlled spectrometer with a microscope-guided grid head containing the laser excitation source and detector and optics.
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Citations
29 Claims
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1. A method to analyze media for composition and authentication of a source of unknown media comprising the steps of:
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exposing a sample of unknown media simultaneously to multiple wavelengths from multiple laser sources;
reading a Raman spectra of the sample of the unknown media through a variety of detectors each with a specific wavelength detection region using Raman spectroscopy, wherein the Raman spectra comprises at least one Stokes component and/or at least one Anti-Stokes component; and
manipulating mathematically at least one of the Stokes component and/or at least one of the Anti-Stokes component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14, 15)
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8. A method to verify the origin of an unknown sample of a document comprising the steps of:
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exposing a sample of unknown media simultaneously to multiple wavelengths from laser sources in order to create Raman emissions from the sample;
detecting the Raman emissions from the sample using two or more detectors each with a specific wavelength detection region, wherein the Raman emissions comprises at least one Stokes component and/or at least one Anti-Stokes component; and
comparing the detected Raman spectra with Raman spectra previously stored in a database. - View Dependent Claims (9, 10, 11, 12, 13, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29)
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16. A computer readable medium containing program instructions for verifying the origin of an unknown sample, said program instructions comprising instructions for:
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exposing a sample of unknown media simultaneously to multiple wavelengths from multiple laser sources;
reading a Raman spectra of the sample of the unknown media through a variety of detectors each with a specific wavelength detection region using Raman spectroscopy, wherein the Raman spectra comprises at least one Stokes component and/or at least one Anti-Stokes component; and
manipulating mathematically at least one of the Stokes component and/or at least one of the Anti-Stokes component.
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23. A system for verifying the origin of an unknown sample of a document comprising:
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a chamber for exposing a sample to a multiple wavelength laser source in order to create Raman emissions from the sample;
two or more detectors each with a specific wavelength detection region for detecting the Raman spectra, wherein the Raman spectra comprises at least one Stokes component and/or at least one Anti-Stokes component; and
a computer for manipulating mathematically at least one of the Stokes component and/or the Anti-Stokes component.
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Specification