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Decorrelation-induced phase errors in phase-shifting speckle interferometry.

M Lehmann

    Applied Optics
    |June 1, 1997
    PubMed
    Summary
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    Decorrelation in speckle interferometry causes phase errors. The amount of decorrelation and pixel modulation are key factors, not the number of speckles per pixel.

    Area of Science:

    • Optics and Photonics
    • Metrology

    Background:

    • Speckle interferometry measurements are susceptible to decorrelation.
    • Decorrelation alters speckle fields and random phases, impacting interferometric data.

    Purpose of the Study:

    • To quantitatively investigate decorrelation-induced phase errors in speckle interferometry.
    • To analyze these errors for image and pupil plane decorrelation in various interferometer types.

    Main Methods:

    • Calculations considered aperture and pixel size effects, including resolved and unresolved speckles.
    • Phase error statistics were derived from probability densities before and after decorrelation.

    Main Results:

    • Most scenarios exhibit identical phase error statistics, independent of speckles per pixel.

    Related Experiment Videos

  • Decorrelation-induced phase errors are primarily determined by the extent of decorrelation and pixel modulation.

    • Conclusions:

    • The study quantifies phase errors in speckle interferometry due to decorrelation.
    • Identified key parameters influencing these errors, offering insights for improved measurement accuracy.