Optical: systems and elements – Optical frequency converter
Reexamination Certificate
2006-12-26
2006-12-26
Lee, John D. (Department: 2874)
Optical: systems and elements
Optical frequency converter
C382S124000
Reexamination Certificate
active
07154661
ABSTRACT:
The present invention relates to a method and apparatus for clearly imaging samples such as fingerprints on substrates of forensic samples. The present invention overcomes the problems of the Laser-Induced-Fluorescence (LIF) technique to distinguish fluorescence from the sample from that of the substrate. The method of the present invention uses either a homodyne- or a heterodyne-assisted phase resolving method, or both, to suppress the contribution of the substrate fluorescence. The resulting image of the sample will then be sufficiently clear for forensic purposes. The present invention may also be used on histological and biochemical samples to visualise latent images.
REFERENCES:
patent: 6306662 (2001-10-01), Menzel
patent: 2002/0020818 (2002-02-01), Mitchell et al.
E. Roland Menzel; Recent Advances in Photoluminescence Detection of Fingerprints; The Scientifice World; 2001; 1, 498-509.
B.E. Dalrymple, et al.; Inherent Fingerprint Luminescence—Dectection by Laser; Journal of Forensic Sciences; vol. 21; 1976; pp. 106-115.
Chao Zhixia
Ong Lin Seng
Ong Sock Koon
Seah Leong Keey
Unnimadhava Kurup Soudamini Amma Dinish
Dinsmore & Shohl LLP
Lee John D.
Nanyang Technological University
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