Journal Published Online: 01 May 2000
Volume 45, Issue 3

A Scanning Beam Time-Resolved Imaging System for Fingerprint Detection

CODEN: JFSCAS

Abstract

A highly sensitive confocal scanning-beam system for time-resolved imaging of fingerprints is described. Time-resolved imaging is a relatively new forensic procedure for the detection and imaging of latent fingerprints on fluorescent substrates such as paper, cardboard, and fluorescent paint. Ordinary fluorescent imaging of latent fingerprints on these surfaces results in poor contrast. Instead, the specimens are treated with a phosphorescent dye that preferentially adheres to the fingerprint which allows time-resolved discrimination between the fingerprint phosphorescence and the background fluorescence. Time resolved images are obtained by synchronizing the digital sampling of the specimen luminescence with the on-off cycle of the chopped illumination beam. The merit of this technique is illustrated with high contrast images of fingerprints obtained from the fluorescent painted surface of a Coke™ can.

Author Information

Roorda, RD
University of Waterloo, Waterloo, Ontario, Canada
Ribes, AC
University of Waterloo, Waterloo, Ontario, Canada
Damaskinos, S
University of Waterloo, Waterloo, Ontario, Canada
(Ted) Dixon, AE
University of Waterloo, Waterloo, Ontario, Canada
Menzel, ER
Texas Tech University, Lubbock, TX
Pages: 5
Price: $25.00
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Stock #: JFS14729J
ISSN: 0022-1198
DOI: 10.1520/JFS14729J