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Modulation measuring profilometry with auto-synchronous phase shifting and vertical scanning.

Min Zhong, Xianyu Su, Wenjing Chen

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    |January 22, 2015
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    Summary
    This summary is machine-generated.

    A new modulation measuring profilometry method uses auto-synchronous phase shifting and vertical scanning for accurate 3D object shape determination. This technique avoids shadows and occlusions by employing a coaxial optical system for precise surface profiling.

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    Area of Science:

    • Optical Metrology
    • 3D Surface Profilometry
    • Computational Imaging

    Background:

    • Accurate 3D shape determination of complex objects is crucial in various scientific and industrial fields.
    • Traditional methods like triangulation-based profilometry often suffer from shadow and occlusion issues.
    • Existing phase-shifting techniques require separate steps for phase shifting and vertical scanning, limiting efficiency and accuracy.

    Purpose of the Study:

    • To propose a novel modulation measuring profilometry technique for high-accuracy 3D shape measurement.
    • To integrate auto-synchronous phase shifting and vertical scanning into a single system.
    • To overcome limitations of existing methods, such as shadow and occlusion, and improve measurement efficiency.

    Main Methods:

    • A coaxial optical system for projection and observation was employed to eliminate shadow and occlusion.
    • A 1D precision translation platform was used to move a sinusoidal grating for simultaneous phase shifting and vertical scanning.
    • Fringe patterns were captured by a CCD camera, and object profiles were reconstructed using the relationship between height values and modulation distributions, calculated from intensity curves at specific pixel coordinates.

    Main Results:

    • The proposed modulation measuring profilometry successfully achieved auto-synchronous phase shifting and vertical scanning.
    • The coaxial optical system effectively prevented shadow and occlusion artifacts.
    • Computer simulations and experimental results validated the feasibility and accuracy of the proposed method for 3D object shape reconstruction.

    Conclusions:

    • The novel modulation measuring profilometry offers a feasible and accurate approach for 3D shape determination of complex objects.
    • The integrated system enhances measurement efficiency by combining phase shifting and vertical scanning.
    • This technique provides a valuable tool for applications requiring high-precision surface profiling.