Authentication system, data device, and methods for using the same

US7175086B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• David Gilles Gascoyne · Schenectady, US
• Brian Lee Lawrence · Clifton Park, US
• Sriramakrishna Maruvada · Evansville, US
• Radislav Alexandrovich Potyrailo · Niskayuna, US
• Philippe Schottland · Sparta, US
• Micah Sze · Albany, US
• Marc Brian Wisnudel · Clifton Park, US

Key dates

• Filing date: Apr 21, 2004
• Grant date: Feb 13, 2007
• Expiry date: Aug 19, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/0627
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An authentication system may comprise: a first light source, a second light source, and at least three optically filtered light sensing devices. The first light source can have a first light source spectral distribution and can be capable of providing sufficient excitation to produce a photoluminescent emission from a medium comprising a luminescent tag and a color. The second light source can have a visible multi-wavelength spectral distribution and can be capable of providing sufficient visible multi-wavelength illumination of the medium to generate a second analog response. Each light sensing device can have a different device spectral sensitivity range.