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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Spherical aberration measurement with shearing interferometer using fourier imaging and moiré method.

S Yokozeki, K Ohnishi

    Applied Optics
    |February 6, 2010
    PubMed
    Summary

    This study presents a novel optical method for measuring lateral spherical aberration in camera lenses. The technique simplifies aberration analysis by using a plane reference wavefront, eliminating the need for fringe distortion correction.

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    Area of Science:

    • Optical Metrology
    • Lens Aberration Analysis
    • Fourier Optics

    Background:

    • Lateral spherical aberration affects image quality in camera lenses, particularly those with low f-numbers.
    • Traditional measurement methods using shearing interferometry often require complex distortion correction for fringe patterns.

    Purpose of the Study:

    • To develop and demonstrate an experimental method for quantitative measurement of lateral spherical aberration.
    • To simplify the analysis of lateral spherical aberration by eliminating the need for fringe distortion correction.

    Main Methods:

    • Utilized a shearing interferometer combined with Fourier imaging and the moire method.
    • Employed an optical arrangement with a plane reference wavefront.
    • Measured the aberration of a camera lens with a small f/number (1.7).

    Main Results:

    • Successfully obtained fringe patterns directly illustrating lateral spherical aberration.
    • The proposed method eliminated the necessity of fringe distortion correction.
    • Quantitative measurements of lateral spherical aberration were achieved.

    Conclusions:

    • The developed optical arrangement offers a simplified and effective approach for measuring lateral spherical aberration.
    • Using a plane reference wavefront is key to obtaining direct fringe patterns without distortion correction.
    • This method enhances the efficiency of lens aberration analysis.