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Updated: Jun 24, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Measurement technology based on a Stokes parametric polarization system.

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    |June 10, 2024
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    This study introduces a novel polarization-based structured light measurement method using Stokes parameters to enhance accuracy. It optimizes polarization angles for improved image quality and faster, more precise measurements in challenging reflective environments.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision and Image Processing
    • Metrology

    Background:

    • Structured light measurement systems commonly employ polarization filters to mitigate interference from highly reflective surfaces.
    • However, conventional polarization filtering can reduce image brightness in dark areas, compromising measurement accuracy.
    • Existing methods struggle with interference and suboptimal image quality in challenging lighting conditions.

    Purpose of the Study:

    • To propose and validate a new structured light measurement method using Stokes parameters to overcome limitations of traditional polarization filtering.
    • To enhance measurement accuracy and efficiency by optimizing polarization angle selection.
    • To improve overall image quality and signal-to-noise ratio in structured light systems.

    Main Methods:

    • A novel measurement approach utilizing Stokes parameters is proposed for polarization-based structured light systems.
    • Images are captured at specific polarization filter angles (0°, 45°, 90°) to calculate Stokes parameters and generate a polarization angle histogram.
    • A quantitative mathematical model determines the optimal polarization angle through orthogonal processing, followed by image fusion of preferred polarization images.

    Main Results:

    • The proposed method effectively reduces interference in highly reflective regions, a common issue with conventional polarization filters.
    • Significant improvements in fringe pattern quality and signal-to-noise ratio were observed.
    • The quantitative mathematical model enabled rapid and accurate selection of polarization angles, boosting system efficiency.

    Conclusions:

    • The Stokes parameter-based method offers a robust solution for structured light measurements in environments with varying reflectivity.
    • This approach enhances measurement accuracy and system efficiency by optimizing polarization parameters.
    • The technique successfully addresses interference and improves image quality, making it valuable for advanced metrology applications.