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High-precision laser transverse differential confocal radius measurement method.

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    A new transverse differential confocal radius measurement (TDCRM) method offers high-precision, environment-insensitive radius of curvature (ROC) measurement. This technique simplifies alignment, reducing measurement time for optical manufacturing applications.

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    Area of Science:

    • Optical Engineering
    • Metrology

    Background:

    • Accurate radius of curvature (ROC) measurement is critical in optical manufacturing.
    • Existing methods like differential confocal radius measurement (DCRM) require precise alignment, increasing setup time.

    Purpose of the Study:

    • To introduce a novel transverse differential confocal radius measurement (TDCRM) method.
    • To achieve high-precision and environment-insensitive ROC measurements.
    • To reduce the time and complexity of ROC measurements.

    Main Methods:

    • Utilized a D-shaped aperture and virtual pinhole technology.
    • Acquired two differential confocal signals from segmented CCD images.
    • Determined cat's-eye and confocal positions using signal differences.

    Main Results:

    • Achieved high-accuracy ROC measurement with a relative repeatability of 3.4 ppm.
    • Eliminated the need for optical alignment after objective lens changes.
    • Significantly reduced measurement time compared to DCRM.

    Conclusions:

    • TDCRM provides a high-precision, efficient, and simplified approach to ROC measurement.
    • The method is suitable for optical manufacturing and mass production instruments.
    • TDCRM offers a significant advancement over traditional DCRM techniques.