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Identifying subsurface metal microstructure and its materials via quantum wide-field microscope.

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    This study introduces a new nondestructive inspection method using quantum sensing to detect subsurface metal microstructure. This quantum testing technology enhances materials evaluation and engineering maintenance.

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    Area of Science:

    • Materials Science
    • Quantum Technology
    • Nondestructive Testing

    Background:

    • Evaluating subsurface metal microstructure is vital for engineering structure performance.
    • Current methods may lack precision in characterizing intricate microstructures.
    • Advanced techniques are needed for accurate materials evaluation.

    Purpose of the Study:

    • To present a novel nondestructive inspection method for subsurface metal microstructure characterization.
    • To integrate quantum sensing with electromagnetic theory and optical imaging.
    • To establish a relationship between microwave fields and metallic material properties.

    Main Methods:

    • Utilized nitrogen-vacancy (NV) centers for characterizing induced microwave fields in metallic materials.
    • Analyzed the relationship between microwave fields and material conductivity theoretically.
    • Applied microstrip transmission theory to understand microwave field variations due to defects.

    Main Results:

    • Successfully characterized microwave fields of six different metallic materials within a 1000×1000 µm² field of view.
    • Established a correlation between induced microwave fields and the electrical conductivity of metals.
    • Identified and analyzed microwave field differences caused by various subsurface metallic defect structures.

    Conclusions:

    • The integrated quantum sensing and optical imaging method is feasible for characterizing subsurface metallic materials and structures.
    • This approach offers a promising advancement in materials evaluation and engineering maintenance.
    • The study highlights the expanding applications of quantum testing technologies.