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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Sub-millimeter depth-resolved digital holography.

Joseph van Rooij, Jeroen Kalkman

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    |October 20, 2017
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    Summary
    This summary is machine-generated.

    We developed a new digital holography technique for precise surface topography measurement. This method achieves sub-millimeter depth resolution, enabling rapid, large-area characterization of rough objects.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Surface Science

    Background:

    • Accurate surface topography measurement is crucial for material science and engineering.
    • Digital holography offers non-contact surface profiling but often lacks sufficient axial resolution for rough objects.

    Purpose of the Study:

    • To present a novel sub-millimeter full-field depth from focus digital holography technique.
    • To demonstrate its capability for rapid, large-area surface topography imaging of rough objects.

    Main Methods:

    • The technique calculates object depth per pixel using intensity image variance across reconstruction distances.
    • Theoretical analysis of axial resolution was performed.
    • Experimental validation used a digital holography setup without magnifying optics or lateral scanning.

    Main Results:

    • Sub-millimeter axial resolution was theoretically shown to be feasible.
    • Experimental demonstration achieved 100 μm axial resolution depth ranging.
    • High-resolution surface topography imaging of rough objects was successfully performed.

    Conclusions:

    • The developed digital holography method significantly improves upon previous techniques for axial resolution.
    • This advancement enables rapid and precise large-area characterization of surface topography.
    • The technique holds promise for various industrial and scientific applications requiring detailed surface analysis.