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Laser reflection differential confocal large-radius measurement for concave surfaces.

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    |August 22, 2018
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    A new laser reflection differential confocal large-radius measurement (RDCLM) method accurately measures concave lens surfaces. This technique achieves a low relative measurement uncertainty of 0.003% for large radius of curvature measurements.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Surface Science

    Background:

    • Accurate measurement of large radius of curvature (ROC) for concave surfaces is critical in optical manufacturing.
    • Existing methods may face challenges with precision and applicability to large concave optics.

    Purpose of the Study:

    • To propose and validate a novel laser reflection differential confocal large-radius measurement (RDCLM) method for precise concave surface characterization.
    • To determine the radius of curvature of concave lenses with high accuracy.

    Main Methods:

    • The RDCLM method utilizes the focus property of a laser differential confocal system to identify key surface vertices.
    • It measures the moving distance of the test lens (L), using the objective lens focal length (f) and system aperture (D) to calculate ROC.

    Main Results:

    • The RDCLM method precisely identifies the surface vertex of the test lens and the last surface vertex of the objective lens.
    • Preliminary experiments demonstrate a relative measurement uncertainty of 0.003% for a concave lens with a ROC of -5003 mm.

    Conclusions:

    • The proposed RDCLM method offers a highly accurate and reliable approach for measuring the radius of curvature of large concave optical surfaces.
    • This technique has significant potential for quality control in advanced optical component manufacturing.