Self-correlation fiber specklegram sensor using volume characteristics of speckle patterns

Jorge A. Gómez, Ángel Salazar

    Research output: Contribution to journalArticle in an indexed scientific journalpeer-review

    13 Scopus citations


    Tuning of the dynamic range of a micro-displacement fiber specklegram sensor based on two-wave mixing on a photorefractive material Bi 12SiO 20 (BSO) and self-correlation operations of speckle patterns is experimentally demonstrated. The high modal interference present in a standard plastic optical fiber (POF) allows generating a Gaussian pattern of subjective speckle, which is recorded in the volume crystal. The volume characteristics of the fiber speckle are changed using a pupil aperture adjacent to the imaging lens of the speckle. A notorious effect of the three dimensional structure of the speckle on the dynamic range of the metrological system is observed, such that, the performance of the sensor can be improved by a simple mechanical action on the pupil aperture. The behavior of the self-correlation loss of the sensor can be adequately described by a squared normalized Bessel function.

    Original languageEnglish
    Pages (from-to)812-815
    Number of pages4
    JournalOptics and Lasers in Engineering
    Issue number5
    StatePublished - May 2012

    Bibliographical note

    Funding Information:
    J.A. Gómez acknowledges the financial support of the Politécnico Colombiano Jaime Isaza Cadavid for his Ph.D. studies and for the resources for the Research Project 2061090125 . A. Salazar acknowledges the financial support of the Universidad Pontificia Bolivariana, Medellín-Colombia, and its Centro de Investigación para el Desarrollo y la Innovación, CIDI , through the Research Project 635A-02/10–27 .


    • Fiber speckle
    • Photorefractive
    • Self-correlation
    • Sensing


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