Analysis of laser speckle patterns from fingertips

Theis Faber Quist Iversen, Steen Grüner Hanson

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    The trend in human-machine interface technology is heading towards optical solutions for tracking and movement detection. Especially, interactive touch screens and pads, in which the movement of the user’s fingertips is detected and tracked, are of great commercial interest. The applications range from mobile phones to laptops and PDA´s. However, the dynamics of scattered light from live tissue must be taken into account when designing optical sensor systems for tracking e.g. fingertips in touch-applications. Especially, when using coherent light sources, the statistics of the speckle-pattern originating from the scattering structure is of critical importance for the sensor performance and has to be understood in details. We investigate theoretically and experimentally the characteristics of the dynamics of backscattered speckle pattern generated by a human fingertip and address the effects of an intermediate optically flat interface, between the fingertip and the illuminating light source.
    Original languageEnglish
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Volume7726
    Pages (from-to)772621
    ISSN0277-786X
    Publication statusPublished - 2010
    EventPhotonics Europe 2010: Optical Sensing and Detection - The Square Conference Center, Brussels, Belgium
    Duration: 12 Apr 201016 Apr 2010
    http://spie.org/x40293.xml

    Conference

    ConferencePhotonics Europe 2010
    LocationThe Square Conference Center
    Country/TerritoryBelgium
    CityBrussels
    Period12/04/201016/04/2010
    Internet address

    Keywords

    • Bio speckle
    • Speckle interferometry
    • Laser speckle

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