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Laser confocal cylindrical radius measurement method and its system.

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    A new laser confocal cylindrical radius of curvature measurement (CCRM) method precisely measures cylindrical surfaces. This high-precision technique offers a simple structure and strong environmental interference capability, making it ideal for engineering applications.

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    Area of Science:

    • Metrology and Measurement Science
    • Optical Engineering
    • Surface Metrology

    Background:

    • Accurate measurement of cylindrical radius of curvature is critical in various engineering applications.
    • Existing methods often face limitations in precision, structural complexity, or environmental robustness.

    Purpose of the Study:

    • To propose and validate a novel laser confocal cylindrical radius of curvature measurement (CCRM) method.
    • To enhance the precision and applicability of cylindrical surface metrology.

    Main Methods:

    • Utilizing a laser confocal system to identify the vertex and curvature center of a cylindrical surface.
    • Employing the axial intensity curve's maximum point to pinpoint the laser confocal system's focus.
    • Implementing a distance measuring instrument for accurate positional data and quadratic fitting for enhanced accuracy.

    Main Results:

    • The CCRM method demonstrates high measurement precision and a simple, robust structure.
    • The established CCRM system achieved a relative uncertainty better than 0.045% in preliminary experiments.
    • The method exhibits strong capability to withstand environmental interference.

    Conclusions:

    • The CCRM method provides an effective and highly precise approach for measuring cylindrical radius of curvature.
    • Its advantages make it particularly suitable for demanding engineering applications.
    • The developed system offers a significant advancement in optical metrology for cylindrical surfaces.