Method and apparatus for imaging latent fingerprints

Optical: systems and elements – Optical frequency converter

Reexamination Certificate

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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.

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