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Resolution verification sensing device for a stereo digital image correlation system based on dual-frequency laser

Chang Ma, Zhoumo Zeng, Hui Zhang

    Applied Optics
    |December 25, 2019
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    This study introduces a novel method for verifying the measurement resolution of Digital Image Correlation (DIC) instruments. A high-precision laser interferometer was used to validate the accuracy and resolution of a stereo DIC system.

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    Area of Science:

    • Optical Measurement
    • Materials Mechanics
    • Nondestructive Testing

    Background:

    • Digital Image Correlation (DIC) is a noncontact, full-field optical measurement technique crucial in materials science and engineering.
    • Measurement accuracy and resolution are key performance indicators for DIC instruments, yet verification methods are underdeveloped.
    • Current research on DIC primarily addresses accuracy factors, noise reduction, and algorithm improvements, with limited focus on resolution verification.

    Purpose of the Study:

    • To address the lack of standardized resolution verification for Digital Image Correlation (DIC) instruments.
    • To propose and validate a novel sensing device for assessing DIC measurement resolution.
    • To evaluate the accuracy and resolution of a self-made stereo DIC system.

    Main Methods:

    • Designed a sensing device based on a high-precision dual-frequency laser interferometer principle.
    • Employed the developed sensing device to test and evaluate a self-made stereo DIC instrument.
    • Quantified the measurement accuracy and resolution of the DIC system under controlled conditions.

    Main Results:

    • Successfully designed and implemented a laser interferometer-based sensing device for DIC resolution verification.
    • The developed device enabled accurate testing and evaluation of a stereo DIC instrument's performance.
    • Demonstrated the capability of the sensing device to assess both accuracy and resolution.

    Conclusions:

    • Resolution verification is a critical but under-researched aspect of DIC instrument development.
    • The proposed laser interferometer-based sensing device offers a viable method for DIC resolution verification.
    • This work contributes to ensuring the credibility and reliability of DIC measurement data in scientific and industrial applications.