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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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Binocular DIC system for 3D correlation measurements.

Pengxiang Ge, Huanqing Wang, Yin Hu

    Applied Optics
    |May 13, 2021
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    Summary
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    A new mirror-assisted binocular stereo digital image correlation (DIC) system enables 360° deformation measurement and 3D contour reconstruction. This advanced DIC method accurately measures object thickness and dynamic strain, outperforming existing systems.

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    Area of Science:

    • Optical Metrology
    • Digital Image Correlation (DIC)
    • 3D Reconstruction

    Background:

    • Traditional binocular stereo DIC systems face limitations in achieving omnidirectional measurements and accurate thickness calculations.
    • Precise measurement of complex object contours and dynamic strain remains a challenge in experimental mechanics.

    Purpose of the Study:

    • To propose a novel mirror-assisted binocular stereo digital image correlation (DIC) system.
    • To enable 360° omnidirectional deformation measurement, 3D contour reconstruction, thickness determination, and dynamic strain analysis.
    • To enhance the data acquisition capabilities compared to existing binocular DIC systems.

    Main Methods:

    • Utilizing a mirror-assisted setup to generate multiple virtual and real images of the object.
    • Employing projection speckle technology for precise mirror plane measurement.
    • Conducting 3D contour reconstruction and dynamic tensile experiments to validate the system.

    Main Results:

    • The system successfully achieved 360° omnidirectional deformation measurement.
    • Ideal 3D reconstruction results were obtained for objects with complex contours.
    • Accurate thickness measurement was achieved using virtual images without coordinate subtraction.
    • Separate dynamic strain calculation from front and rear surfaces was demonstrated.

    Conclusions:

    • The proposed mirror-assisted binocular stereo DIC system offers a robust solution for comprehensive object analysis.
    • It provides enhanced capabilities for omnidirectional measurement, thickness, and stress-strain calculations.
    • This method presents a significant advancement over conventional binocular DIC systems, yielding more valid data and excellent results.