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8169591 
Journal Article 
Novel lock-in amplifier for identification of luminescent materials for authentication - art. no. 65671I 
Mcaulay, AD 
2007 
Unk 
Proceedings of SPIE
ISSN: 0277-786X
EISSN: 1996-756X 
PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) 
6567 
I5671-I5671 
lock-in amplifiers; luminescent materials; identification of phosphors; authentication; identification of phosphors from lifetime; measuring phosphor lifetime; detecting counterfeits; detecting forgeries; electronic detection of low signals