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Heatwave distortion correction using an improved reference sample compensation method and multispectral digital image

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    This study introduces a multispectral digital image correlation (DIC) method to correct heatwave distortions in high-temperature measurements. The technique uses a reference sample to accurately compensate for optical path variations, revealing hidden deformation.

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    Area of Science:

    • Optical Measurement
    • Materials Science
    • Mechanical Engineering

    Background:

    • High-temperature digital image correlation (DIC) is susceptible to heatwave distortions caused by temperature and refractive index variations.
    • These distortions lead to inaccuracies in displacement measurements, masking true material behavior.
    • Existing methods struggle to effectively compensate for these optical path disturbances.

    Purpose of the Study:

    • To propose and validate a multispectral DIC-aided reference sample compensation method.
    • To eliminate heatwave distortions in high-temperature DIC measurements.
    • To accurately capture real displacement fields and reveal heatwave-hidden deformation.

    Main Methods:

    • A transparent reference glass with fluorescent speckle patterns is attached to the specimen.
    • Multispectral imaging captures blue light from the reference and red light from the specimen under UV and red illumination.
    • A subset-based local 2D-DIC algorithm calculates displacement fields from separated red and blue subimages, with distortions compensated by subtracting reference fields.

    Main Results:

    • Static heatwave experiments demonstrate the method's feasibility and accuracy in correcting distortions.
    • A uniaxial tensile test on an aluminum specimen confirmed the method's practicality.
    • The technique successfully revealed deformation previously obscured by heatwave effects.

    Conclusions:

    • The proposed multispectral DIC method effectively eliminates heatwave distortions in high-temperature measurements.
    • This compensation technique enables accurate real displacement field calculations.
    • The method enhances the reliability of DIC for analyzing material behavior under extreme thermal conditions.