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Related Experiment Video

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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Optical distortion evaluation based on the Integrated Colour CCD Moiré Method.

Jiaye Zhao, Yue Hou, ZhanWei Liu

    Optics Express
    |December 28, 2019
    PubMed
    Summary

    The Integrated Colour CCD Moiré Method (ICCM) accurately calibrates micro-nano lenses by analyzing moiré fringes. This advanced technique precisely determines lens distortion and rotation angles for high-precision optical measurements.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Microscopy

    Background:

    • High-precision optical measurement, especially in micro-nano fields, requires accurate camera calibration.
    • Lens distortion is a significant challenge in achieving precise measurements at micro-nano scales.

    Purpose of the Study:

    • To develop a novel lens calibration technique for micro-nano scale optical measurements.
    • To accurately determine lens distortion and rotation angles simultaneously.

    Main Methods:

    • Integrated Colour CCD Moiré Method (ICCM) utilizing integrated correlation calculation and CCD moiré.
    • Formation of CCD moiré fringes by superimposing specimen grating with CCD target or Bayer filter array.
    • Particle swarm optimization algorithm for accurate inversion of lens distortion and rotation angles.

    Main Results:

    • The ICCM method successfully and simultaneously inverts lens distortion, rotation angle, and grating pitch with high precision.
    • Lens distortion of a metallographic microscope was accurately characterized using an 833 nm pitch grating.
    • Numerical experiments and simulations validated the method's accuracy, robustness, and anti-noise capabilities.

    Conclusions:

    • The developed ICCM technique offers an intuitive, accurate, anti-noise, and robust solution for lens distortion calibration.
    • ICCM significantly enhances precision in micro-nano optical measurements.
    • This method is suitable for characterizing lens distortion in various microscopic applications.