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Scanning Beam Time-Resolved Imaging System for Fingerprint Detection

NCJ Number
183933
Journal
Journal of Forensic Sciences Volume: 45 Issue: 3 Dated: May 2000 Pages: 563-567
Author(s)
Robert D. Roorda M.Sc.; Alfonso C. Ribes Ph.D.; Savvas Damaskinos Ph.D.; A. E. (Ted) Dixon Ph.D.; E. Roland Menzel Ph.D.
Date Published
May 2000
Length
5 pages
Annotation
This article describes a scanning beam time-resolved imaging system for fingerprint detection.
Abstract
The article describes a highly sensitive confocal scanning-beam system for time-resolved imaging of fingerprints. 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, permitting 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 soda can. Figures, references