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Related Experiment Video

Updated: Jun 7, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

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Published on: May 23, 2017

Fizeau phase-measuring interferometry using the moiré effect.

B V Dorrío, A F Doval, C López

    Applied Optics
    |November 6, 2010
    PubMed
    Summary

    This study presents automated fringe pattern analysis for Fizeau interferometry using moiré effects and phase-stepping. This method simplifies phase steps by translating a Ronchi grid, achieving high repeatability in measurements.

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    Area of Science:

    • Optical metrology
    • Interferometry
    • Image analysis

    Background:

    • Fizeau interferometry is crucial for precise optical surface measurements.
    • Traditional fringe analysis can be complex and time-consuming.
    • Automation is key to improving efficiency and accuracy in metrology.

    Purpose of the Study:

    • To automate fringe pattern analysis in Fizeau interferometry.
    • To integrate the moiré effect with phase-stepping for enhanced evaluation.
    • To develop a simplified phase-stepping mechanism.

    Main Methods:

    • Utilizing a Ronchi grid as a phase modulator at the interferometer's image plane.
    • Generating moiré patterns through incoherent superposition.
    • Implementing phase stepping by translating the Ronchi grid perpendicularly to the optical axis.

    Main Results:

    • Successful automation of fringe pattern analysis in Fizeau interferometry.
    • Demonstrated moiré image formation via incoherent superposition.
    • Achieved root-mean-square (rms) repeatabilities of less than 3 degrees in phase-difference values.

    Conclusions:

    • The combined moiré effect and phase-stepping method offers an effective approach for automated Fizeau interferometry.
    • Grid translation provides a simple and repeatable way to introduce phase steps.
    • The developed technique enhances measurement accuracy and efficiency in optical metrology.