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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Small-size, high-resolution angular displacement measurement technology based on an imaging detector.

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    Designing a small photoelectric encoder with high resolution is difficult. This study developed a compact absolute photographic encoder achieving 1.24 arcsec resolution, offering a foundation for advanced rotary encoder technology.

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    Area of Science:

    • * Optoelectronics and Sensor Technology
    • * Precision Measurement Systems

    Background:

    • * Designing compact photoelectric encoders with high resolution and accuracy presents significant challenges.
    • * Traditional moiré fringe methods limit resolution in small-sized gratings.
    • * Photoelectric and digital signal processing offer enhanced angle measurement resolution.

    Purpose of the Study:

    • * To investigate grating displacement coding and decoding for high-resolution encoders.
    • * To analyze factors contributing to measurement errors in high-resolution systems.
    • * To design and validate a small-size absolute photographic encoder.

    Main Methods:

    • * Development of a novel grating displacement coding and decoding scheme.
    • * Implementation of high-resolution subdivision techniques.
    • * Analysis of measurement error sources and their impact on encoder performance.

    Main Results:

    • * A 50 mm diameter absolute photographic encoder was successfully designed and fabricated.
    • * The encoder achieved a high resolution of 1.24 arcseconds (20 bits).
    • * A low standard deviation of error of 14.3 arcseconds was recorded.

    Conclusions:

    • * The developed encoder demonstrates the feasibility of achieving high resolution in a small form factor.
    • * The findings provide a theoretical and technological basis for future small-size, high-resolution photographic rotary encoders.
    • * This research advances the field of precision angular measurement for compact devices.