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Simultaneous multi-segmented mirror orientation test system using a digital aperture based on sheared Fourier

Heejoo Choi, Isaac Trumper, Matthew Dubin

    Optics Express
    |August 10, 2017
    PubMed
    Summary

    A new simultaneous multi-segmented mirror orientation test system (SMOTS) precisely measures mirror surface orientation. This advanced optical testing method achieves high accuracy for both flat and concave mirrors, enabling real-time monitoring.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Instrumentation

    Background:

    • Accurate measurement of mirror surface orientation is critical for optical system performance.
    • Existing methods may lack the speed or precision required for multi-segmented or complex mirror geometries.

    Purpose of the Study:

    • To introduce a novel simultaneous multi-segmented mirror orientation test system (SMOTS).
    • To demonstrate high-accuracy, rapid orientation measurements for various mirror types.

    Main Methods:

    • Utilized localized sheared images captured by a CMOS camera.
    • Employed reflected 2D sinusoidal patterns to assess mirror surface orientation.
    • Developed a system capable of simultaneous measurement of multiple mirror segments.

    Main Results:

    • Achieved surface orientation measurement accuracy of 0.8 µrad for a flat mirror.
    • Successfully measured the orientation variation of seven mirror segments simultaneously.
    • Determined the orientation of two concave mirrors with an accuracy of 2.7 µrad.
    • Completed the measurement of seven segments in just 0.07 seconds.

    Conclusions:

    • SMOTS provides a highly accurate and efficient method for testing mirror orientation.
    • The system is suitable for monitoring mirror segment orientation in real-time for diverse optical setups.
    • This technique advances the capabilities in optical metrology and system calibration.