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In-line digital holographic interferometry.

G Pedrini, P Fröning, H Fessler

    Applied Optics
    |February 21, 2008
    PubMed
    Summary
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    This study presents an in-line digital holography system for deformation evaluation. It digitally reconstructs and filters holograms to accurately measure object deformations using phase differences.

    Area of Science:

    • Optical Engineering
    • Metrology
    • Digital Holography

    Background:

    • In-line digital holography offers a simplified optical setup for capturing holographic data.
    • A key challenge in in-line holography is the presence of overlapping twin images, which can complicate reconstruction.
    • Accurate measurement of object deformation is crucial in various engineering and scientific fields.

    Purpose of the Study:

    • To describe an optical system utilizing in-line digital holography for precise deformation evaluation.
    • To address and overcome the issue of twin image overlap in in-line holographic recordings.
    • To demonstrate a method for calculating object deformation from recorded interferograms.

    Main Methods:

    • In-line digital holography was employed, recording holograms on a CCD chip.

    Related Experiment Videos

  • Digital reconstruction and filtering techniques were used to eliminate unwanted wave fronts and twin images.
  • Two separate interferograms of an object in undeformed and deformed states were captured.
  • Phase differences between reconstructed wave fronts were calculated to determine deformation.

    • Main Results:

    • The developed system successfully recorded in-line holograms on a CCD chip.
    • Digital reconstruction and filtering effectively resolved the twin image problem.
    • Phase differences were accurately extracted from the reconstructed wave fronts.
    • The system enabled quantitative calculation of object deformation.

    Conclusions:

    • The described in-line digital holography system provides a viable method for deformation evaluation.
    • Digital processing techniques are effective in overcoming limitations of in-line holography.
    • The presented approach allows for accurate measurement of object deformations.