Radiant energy – Luminophor irradiation – Methods
Reexamination Certificate
2005-02-01
2005-02-01
Fields, Carolyn E. (Department: 2506)
Radiant energy
Luminophor irradiation
Methods
C250S458100
Reexamination Certificate
active
06849855
ABSTRACT:
A method of marking and identifying an object (10) by the marking consists of applying to an object (10) an up-conversion material (12), then irradiating the object (10) with infrared electromagnetic radiation (16) and, finally, observing the irradiated object to detect the spectrum of emitted electromagnetic radiation (18). A suitable up-conversion material (12) is selected from a group of up-conversion materials consisting of CaF2, BaF2, CdF2, LaF2and SrF2doped with erbium, praseodymium, neodymium or dysprosium. The objects (10) may be observed to detect emitted electromagnetic radiation (18) from that part of the electromagnetic spectrum that is visible to the naked eye. The objects (10) may also be observed to detect specific wavelengths of electromagnetic radiation which are known to be emitted by the up-conversion material (12) when the up-conversion material (12) is irradiated by designated wavelengths of infrared electromagnetic radiation. The irradiating infrared radiation (16) may be encoded by modulation so that identification may be made by detection of the encoded modulation in the radiation emitted (18) from the up-conversion material (12).
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Chang David B.
Shih I-Fu
Alkov Leonard A.
Dunn Drew A.
Fields Carolyn E.
Raytheon Company
Vick Karl A.
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