Patent ID: 7202943
Filing Date: 2007-04-10
Classification: B82Y,G06K,Y10T

Abstract:
1. A system for identity determination of a subject in sunlight, the system comprising: coating means applied to said subject, said coating means fluorescing when activated by an activating optical beam; optical beam means for providing said activating optical beam; receptor means for detecting fluorescence of said coating means when said coating means fluoresces; data processing means for processing data derived from fluorescence of said coating means by way of said receptor means, wherein said fluorescence of said coating means has encoded thereon at least one identification code identifying said object, and wherein said coating means fluoresces at wavelengths which correspond to a wavelength of at least one Fraunhofer line in the solar spectrum such that fluorescence of said coating means is detectable by said receptor means in sunlight ,wherein said fluorescent semiconductor nanocrystals fluoresces at different wavelengths, at least one of said different wavelengths corresponding to a wavelength of a Fraunhofer line in a spectrum of the sun, at least one of said different wavelengths corresponding to a wavelength selected from a group comprising: 686.7–688.4 nm, 656.28 nm, 627.6–628.7 nm, 589 . . .592 nm, 589.595 nm, 587.56 nm, 526.95 nm, 518.36 nm, 517.27 nm, 516.89 nm, 516.74 nm, 516.73 nm, 495.76 rim, 486.13 nm, 466.81 nm, 438.35 nm, 434.05 nm, 430.79 nm, 430.77 nm, 422.67 nm, 410.17 nm, 396.84 nm, and 393.37 nm.