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Photorefractive moiré-like patterns for the multifringe projection method in Fourier transform profilometry.

M E de Oliveira, G N de Oliveira, J C de Souza

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    |February 25, 2016
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    Summary

    This study introduces a novel method for 3D object profilometry using simultaneous moiré-like fringe projection. This technique enhances Fourier transform profilometry by projecting multiple fringe patterns for accurate surface measurement.

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    Area of Science:

    • Optics
    • Holography
    • 3D Metrology

    Background:

    • Fourier transform profilometry (FTP) is a key technique for 3D surface measurement.
    • Traditional FTP methods often face limitations in capturing complex object geometries.
    • Developing advanced fringe projection techniques is crucial for improving measurement accuracy and efficiency.

    Purpose of the Study:

    • To describe a new method for simultaneous moiré-like fringe pattern projection for Fourier transform profilometry.
    • To demonstrate the generation of controlled moiré-like patterns with multiple variation directions.
    • To present the 2D fringe projection stage for a proposed 3D object profilometry procedure.

    Main Methods:

    • Utilizing a photorefractive holographic interferometric process.
    • Superposing high spatial frequency sinusoidal gratings with slightly different pitches to create low spatial frequency fringe patterns.
    • Employing a photorefractive Bismuth Titanate (Bi₁₂TiO₂₀ or BTO) crystal as a dynamic holographic medium to induce optical holographic beating.
    • Projecting two or more moiré-like fringe patterns with at least two different variation directions onto the object surface.

    Main Results:

    • Successfully generated controlled moiré-like fringe patterns with multiple variation directions.
    • Demonstrated the dynamic induction of these patterns via holographic beating within the BTO crystal.
    • Established the 2D fringe projection stage for a comprehensive 3D profilometry approach.

    Conclusions:

    • The proposed method enables simultaneous projection of multiple moiré-like fringe patterns.
    • This technique is a significant advancement in the fringe projection stage of Fourier transform profilometry.
    • The method holds potential for accurate 3D surface profiling of simple objects.