Back to results
US 11,747,268 B2Granted
Coded polymer substrates for banknote authentication
AssigneeSpectra Systems Corporation
InventorNabil Lawandy
Life of this patent
Estimating the term…
Abstract
A method and system for authenticating an item includes irradiating the item, the item including a polymer substrate including a polymer material and a doping material and configured to emit a radiation spectrum having a spectral signature in response to the irradiating, the doping material capable of absorbing or scattering radiation at a specific wavelength to generate the spectral signature, detecting the spectral signature, and determining a code associated with the spectral signature.
Claims20
A method for authenticating an item, comprising:
- providing the item including a polymer substrate comprising a polymer material and a doping material, the polymer substrate being transparent to visible spectrum radiation, the polymer material and the doping material configured to transmit radiation through the polymer substrate, and the doping material capable of absorbing and scattering radiation of at least one specific wavelength to generate a spectral signature including a notched pattern in a spectral band of wavelengths of the transmitted radiation;
- irradiating the item with incident radiation characterized by a spectral band of wavelengths spanning a band of wavelengths including the at least one specific wavelength absorbed and scattered by the doping material, the polymer substrate absorbing and scattering radiation of the incident radiation to generate the spectral signature in the spectral band of wavelengths of the incident radiation and transmitting the radiation having the generated spectral signature through the polymer substrate;
- detecting the spectral signature after the radiation is transmitted through the polymer substrate;
- and
- determining a code associated with the spectral signature.
2 more elements
A system for authenticating an item, comprising:
- the item including a polymer substrate comprising a polymer material and a doping material, the polymer substrate being transparent to visible spectrum radiation, the polymer material and the doping material configured to transmit radiation through the polymer substrate, and the doping material capable of absorbing and scattering radiation of at least one specific wavelength to generate a spectral signature including a notched pattern in a spectral band of wavelengths of the transmitted radiation;
- a radiation source for irradiating the item with incident radiation characterized by a spectral band of wavelengths spanning a band of wavelengths including the at least one specific wavelength absorbed and scattered by the doping material, the polymer substrate absorbing and scattering radiation of the incident radiation to generate the spectral signature in the spectral band of wavelengths of the incident radiation and transmitting the radiation having the generated spectral signature through the polymer substrate;
- and
- a sensor configured to detect the spectral signature after the radiation is transmitted through the polymer substrate.
1 more element
Dependencies are inferred from the claim text.