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Digital holographic interferometry and speckle interferometry applied on objects with heterogeneous reflecting

Marc P Georges, Cédric Thizy, Fabian Languy

    Applied Optics
    |December 25, 2019
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    This study presents strategies for measuring solid object displacement using digital holographic and speckle interferometry, accommodating both scattering and specular surfaces simultaneously. It details illumination techniques and interpretation methods for accurate displacement analysis in mixed-reflectivity scenarios.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Solid Mechanics

    Background:

    • Digital holographic and speckle interferometry are crucial for solid object displacement measurement.
    • Object surface reflectivity (scattering vs. specular) significantly impacts system design and data acquisition.
    • Practical scenarios often involve objects with mixed surface reflectivity within the field of view.

    Purpose of the Study:

    • To develop and present strategies for simultaneous measurement of solid object displacement in digital holographic and speckle interferometry systems.
    • To address the challenges posed by objects exhibiting both scattering and specular reflectivity zones.
    • To enable accurate displacement analysis in complex surface scenarios.

    Main Methods:

    • Illuminating scattered surface zones with a point source.
    • Illuminating specular surface zones with a diffuser.
    • Developing separate interpretation methods for interferograms generated from different reflectivity types.

    Main Results:

    • Demonstrated strategies for handling mixed reflectivity in interferometric measurements.
    • Generated specific interferograms with distinct characteristics for scattering and specular areas.
    • Showcased separate interpretation of interferometric data based on reflectivity type.

    Conclusions:

    • Effective strategies exist for digital holographic and speckle interferometry on objects with mixed surface reflectivity.
    • Tailored illumination and separate data interpretation are key to accurate displacement measurement.
    • The sensitivity vector definition must account for differing reflectivity characteristics.