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Fringe projection 3D microscopy with the general imaging model.

Yongkai Yin, Meng Wang, Bruce Z Gao

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    This study introduces a new fringe projection 3D microscopy system for precise 3D imaging and metrology of microstructures. The developed system and calibration method enable accurate 3D reconstruction for microelement design and inspection.

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    Area of Science:

    • Optics and Photonics
    • Microscopy
    • Metrology

    Background:

    • Accurate three-dimensional (3D) imaging and metrology of microstructures are essential for microelement design, fabrication, and inspection.
    • Existing methods may face limitations in precision and scope for microscale applications.

    Purpose of the Study:

    • To present a newly developed fringe projection 3D microscopy system.
    • To enable quantitative 3D imaging and full 3D reconstruction of microstructures.

    Main Methods:

    • System configuration with a camera-projector layout and long working distance lenses.
    • Application of the Scheimpflug principle to maximize the use of limited depth of field.
    • Development of a general imaging model and a dedicated calibration procedure for quantitative 3D imaging.

    Main Results:

    • Demonstration of a functional prototype system.
    • Validation of the proposed configuration, imaging model, and calibration approach.
    • Successful quantitative 3D reconstruction of microstructures.

    Conclusions:

    • The presented fringe projection 3D microscopy system is accessible and effective.
    • The developed imaging model and calibration procedure facilitate accurate 3D metrology of microstructures.
    • This approach offers a viable solution for the critical task of microelement inspection and analysis.