A Scanning Beam Time-Resolved Imaging System for Fingerprint Detection

    Volume 45, Issue 3 (May 2000)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 5


    Ribes, AC
    Graduate student, post-doctoral fellow, research associate professor, and professor emeritus, University of Waterloo, Waterloo, Ontario,

    (Ted) Dixon, AE
    Graduate student, post-doctoral fellow, research associate professor, and professor emeritus, University of Waterloo, Waterloo, Ontario,

    Menzel, ER
    Director, Center for Forensic Studies, Lubbock, TX

    Roorda, RD
    Graduate student, post-doctoral fellow, research associate professor, and professor emeritus, University of Waterloo, Waterloo, Ontario,

    Damaskinos, S
    Graduate student, post-doctoral fellow, research associate professor, and professor emeritus, University of Waterloo, Waterloo, Ontario,

    (Received 26 April 1999; accepted 2 August 1999)

    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.


    Paper ID: JFS14729J

    DOI: 10.1520/JFS14729J

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    Author
    Title A Scanning Beam Time-Resolved Imaging System for Fingerprint Detection
    Symposium , 0000-00-00
    Committee E30