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Related Experiment Video

Updated: Jan 19, 2026

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
08:45

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Published on: July 21, 2014

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Speckle pattern shifting deflectometry based on digital image correlation.

Xinwei Zhang, Dahai Li, Ruiyang Wang

    Optics Express
    |September 13, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel digital image correlation (DIC) method for measuring specular surface shapes using a shifted speckle pattern. The technique offers fast, low-cost, and accurate surface metrology without needing a reference element.

    More Related Videos

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    Related Experiment Videos

    Last Updated: Jan 19, 2026

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    Area of Science:

    • Optical Metrology
    • Surface Characterization
    • Digital Image Correlation

    Background:

    • Specular surfaces present challenges for accurate shape measurement.
    • Existing methods may be complex, costly, or require reference elements.

    Purpose of the Study:

    • To propose and validate a new method for specular surface shape measurement.
    • To leverage digital image correlation (DIC) with a shifted speckle pattern.

    Main Methods:

    • A speckle pattern displayed on an LCD screen is shifted across the test surface.
    • Deformed information is encoded in displacement between two speckle images.
    • DIC algorithm calculates displacement, yielding slope data and surface shape.
    • The method is termed Speckle Pattern Shifting Deflectometry (SPSD).

    Main Results:

    • Simulation verified the method's correctness and feasibility.
    • Error sources were analyzed.
    • Acrylic plastic plates and silicon wafers were measured with high accuracy (approx. 1μm RMS over 100mm).
    • Results were compared favorably with established Phase Measuring Deflectometry (PMD).

    Conclusions:

    • The proposed SPSD method provides a fast, simple, and low-cost approach for specular surface shape measurement.
    • It eliminates the need for a reference element.
    • Offers a promising new avenue for optical metrology of reflective surfaces.