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Subaperture stitching interferometry based on the combination of the phase correlation and iterative gradient

Ruoyan Wang, Zhishan Gao, Dan Zhu

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    This study introduces a hybrid algorithm for precise subaperture positioning in stitching interferometry (SAS). The method achieves subpixel accuracy, crucial for accurate large optical component testing.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Precision Measurement

    Background:

    • Subaperture stitching interferometry (SAS) is vital for testing large optics.
    • Accurate positioning of subapertures is critical for precise stitching.
    • Existing methods often rely on mechanical structures for positioning.

    Purpose of the Study:

    • To develop a hybrid optimization algorithm for subpixel-level positioning accuracy in SAS.
    • To improve the precision of large aperture optical component testing.
    • To overcome limitations of traditional positioning methods in SAS.

    Main Methods:

    • A hybrid algorithm combining phase correlation and iterative gradient methods was proposed.
    • Phase correlation calculates initial pixel-level deviations.
    • Iterative gradient optimization refines deviations to subpixel levels.

    Main Results:

    • The hybrid algorithm demonstrated subpixel-level positioning accuracy in simulations.
    • Experimental testing on a 76.2 mm off-axis parabolic mirror validated the method.
    • The resulting surface map matched full aperture testing results.

    Conclusions:

    • The proposed hybrid optimization algorithm offers subpixel-level positioning accuracy for SAS.
    • This method is a powerful tool for precise testing of large optical components.
    • The algorithm enhances the reliability and accuracy of stitching interferometry.