Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1997-06-20
1999-09-28
Hannaher, Constantine
Radiant energy
Coded record and readers; invisible radiant energy type
106 3115, 235468, 283 92, G06K 710
Patent
active
059592966
ABSTRACT:
An apparatus for detecting an invisible, near infrared fluorescing mark disposed on a background comprises: includes an excitation source for exciting the mark, having sufficient power to excite the mark and provide a fluorescent signal the mark from a; a signal detector for detecting the fluorescent signal from the mark; a and power modulator means for varying the power if the excitation source between zero and the maximum power level to produce a decodable fluorescent signal from the mark disposed on the background. A process for decoding an invisible mark having a near infrared fluorescing material includes the steps of: providing at least one invisible, near infrared fluorescing mark disposed on at least one portion of a background; exciting the mark with a laser having a maximum power level sufficient to provide a fluorescent signal from the mark; detecting the fluorescent signal and concurrently varying the power of the laser between zero and its maximum power, to obtain a decodable fluorescent signal.
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Clauberg Horst
Cyr Michael John
Krutak, Sr. James John
Meade Randy Barnett
Moore James Edward
Davis Mark L.
Eastman Chemical Company
Gwinnell Harry J.
Hannaher Constantine
Harding Karen A.
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