Holographic particle-streak velocimetry

Lisa Dixon, Fook Chiong Cheong, David G. Grier

    Research output: Contribution to journalArticlepeer-review


    We present a way to measure the positions and instantaneous velocities of micrometer-scale colloidal spheres using a single holographic snapshot obtained through in-line holographic video microscopy. This method builds on previous quantitative analyses of colloidal holograms by accounting for blurring that occurs as a sphere moves during the camera's exposure time. The angular variance of a blurred hologram's radial intensity profile yields both the magnitude and direction of a sphere's in-plane velocity. At sufficiently low speeds, the same hologram also can be used to characterize other properties, such as the sphere's radius and refractive index.

    Original languageEnglish (US)
    Pages (from-to)4393-4398
    Number of pages6
    JournalOptics Express
    Issue number5
    StatePublished - Feb 28 2011

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics


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