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Updated: Feb 14, 2026

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Integrated polar microstructure and template-matching method for optical position measurement.

Chenyang Zhao, Chifai Cheung, Mingyu Liu

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    This study introduces a novel optical position measurement method using polar microstructures and template matching. The technique achieves high-resolution measurements with minimal length uncertainty, advancing ultra-precision machining applications.

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    Area of Science:

    • Metrology and Measurement Science
    • Optical Engineering
    • Computer Vision and Image Processing

    Background:

    • Accurate optical position measurement is critical for advanced manufacturing and scientific research.
    • Existing methods often face limitations in resolution and accuracy, necessitating innovative solutions.
    • Ultra-precision machining (UPM) and computer vision offer synergistic potential for enhanced metrology.

    Purpose of the Study:

    • To develop and validate an integrated method for high-resolution optical position measurement.
    • To combine the strengths of polar microstructures fabricated via UPM with computer vision template matching.
    • To assess the performance, specifically position accuracy and length uncertainty, of the proposed measurement system.

    Main Methods:

    • Design and fabrication of a novel 'polar microstructure' using ultra-precision diamond machining.
    • Implementation of a template-matching algorithm within a computer vision framework for surface position matching.
    • Experimental validation using a high-precision multi-sensor coordinate measuring machine to evaluate two-axis positioning.

    Main Results:

    • The integrated method demonstrated high-resolution optical position measurement capabilities.
    • Experimental results showed average length uncertainties of 109.6 nm (X-axis) and 91.8 nm (Y-axis).
    • Corresponding standard deviation errors were 76.4 nm (X-axis) and 69.7 nm (Y-axis), indicating precise measurements.

    Conclusions:

    • The proposed polar microstructure and template-matching method offers a viable solution for precise optical position measurement.
    • The integration of UPM and computer vision effectively enhances measurement accuracy and resolution.
    • This technique holds significant promise for applications requiring sub-micron level positioning accuracy.