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High-temperature digital image correlation surface measurement method based on laser projection speckle.

Wanlin Pan, Xingyang Cui, Jiangxun Zhou

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    |March 17, 2026
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    This study introduces a laser-projected speckle method to improve high-temperature 3D topography measurement using digital image correlation (DIC). The new technique overcomes speckle detachment issues, ensuring accurate surface reconstruction even at 1000°C.

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    Area of Science:

    • Metrology
    • Optical Engineering
    • Materials Science

    Background:

    • Spray-applied speckles detach at high temperatures, hindering 3D topography measurement.
    • Digital image correlation (DIC) is sensitive to speckle quality and stability.

    Purpose of the Study:

    • To develop a laser-projected speckle generation method for high-temperature DIC.
    • To evaluate and optimize parameters for stable speckle patterns at 1000°C.
    • To validate the method's accuracy for 3D surface reconstruction.

    Main Methods:

    • Developed an integrated speckle evaluation framework combining image quality and binocular consistency metrics.
    • Analyzed laser, imaging, and optical parameters' effects on speckle quality and DIC accuracy at 1000°C.
    • Performed quantitative and qualitative experiments, including engine turbine blade reconstruction.

    Main Results:

    • Identified optimal experimental settings for laser projection speckle generation.
    • Achieved relative errors of 0%-2% at room temperature and 0%-9% at 1000°C compared to coordinate-measuring machines.
    • Successfully reconstructed the 3D geometry of an engine turbine blade at 1000°C with high accuracy.

    Conclusions:

    • The laser-projected speckle method effectively addresses high-temperature challenges in DIC.
    • The technique demonstrates engineering feasibility for accurate 3D topography measurement in extreme environments.
    • Optimized parameters ensure reliable speckle pattern stability and measurement accuracy.