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Direction-sensitive detection of a spinning object using dual-frequency vortex light.

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    This study introduces a new method for measuring angular velocity using dual-frequency vortex light. It successfully shifts rotational Doppler signals to a high-frequency domain, reducing noise and enabling direct determination of rotation direction.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Signal Processing

    Background:

    • The rotational Doppler effect (RDE) is a promising technique for angular velocity measurement.
    • Conventional RDE methods often use single-frequency vortex light, resulting in low-frequency Doppler signals susceptible to noise.

    Purpose of the Study:

    • To develop an improved RDE detection method with enhanced signal quality and direct direction measurement.
    • To overcome the limitations of low-frequency signals in existing RDE techniques.

    Main Methods:

    • Utilizing dual-frequency, 2-fold multiplexed vortex light as the probe beam.
    • Transforming the rotational Doppler signals from the low-frequency to the high-frequency domain.
    • Comparing modulated and reference signals to determine rotation direction.

    Main Results:

    • Successfully shifted Doppler signals to a high-frequency domain, significantly reducing noise.
    • Achieved high-fidelity measurements with minimal noise interference.
    • Enabled direct and unambiguous determination of the direction of rotation.

    Conclusions:

    • The proposed dual-frequency vortex light method offers a robust and noise-resilient approach for RDE measurements.
    • This technique provides a practical reference for the application of RDE in angular velocity sensing.
    • The ability to directly determine rotation direction enhances the utility of RDE in various scientific and industrial fields.