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Three-dimensional stitching of stereo-deflectometry based on marker points.

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    |October 18, 2022
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    A new 3D stitching method for stereo-deflectometry accurately measures large surface inclinations on complex optical surfaces. This technique enhances precision for mass applications in optical manufacturing.

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    Area of Science:

    • Optics and Optical Engineering
    • Metrology and Measurement Science

    Background:

    • Traditional stereo-deflectometry faces challenges in measuring surfaces with large inclinations.
    • Accurate 3D measurement of complex optical surfaces is crucial for advanced applications.

    Purpose of the Study:

    • To develop and validate a novel 3D stitching method for stereo-deflectometry to overcome limitations in measuring steep surfaces.
    • To enable precise non-contact measurement of large-aperture, high-steepness freeform optical surfaces.

    Main Methods:

    • Proposed a 3D stitching technique for stereo-deflectometry utilizing marker points.
    • Employed binocular stereo vision for coarse stitching and the Iterative Closest Point (ICP) algorithm for fine stitching of 3D data.
    • Constructed a measurement system for an ultra-short lens (100 mm diameter, 52.6° steepness) to test the algorithm.

    Main Results:

    • The 3D stitching algorithm successfully measured the freeform surface of the ultra-short lens.
    • Achieved a spherical fitting error within 60 mm for the reflective bowl after stitching.
    • Demonstrated the feasibility of the proposed method for complex optical surface metrology.

    Conclusions:

    • The developed 3D stitching method effectively addresses the limitations of traditional stereo-deflectometry for steep surfaces.
    • This technique holds significant potential for the mass production and quality control of complex optical components.
    • Paves the way for wider adoption of stereo-deflectometry in advanced optical metrology.