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Detection of a spinning object with circular procession using an optical vortex beam.

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    This study introduces a new method using optical vortex beams to measure two rotational frequencies simultaneously. The technique enhances the rotational Doppler effect for advanced optical metrology and micro-motion detection.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Optical Physics

    Background:

    • The rotational Doppler effect (RDE) typically measures one rotational frequency of a spinning object.
    • Existing RDE applications are limited to simple spinning or combined linear and rotational motion.
    • Optical vortex beams carry orbital angular momentum, enabling more complex interactions.

    Purpose of the Study:

    • To analyze the interaction between optical orbital angular momentum and a spinning object with circular procession.
    • To demonstrate simultaneous measurement of two distinct rotational frequencies.
    • To expand the applicability of RDE in optical metrology and remote sensing.

    Main Methods:

    • Theoretical analysis of the interaction mechanism between optical orbital angular momentum and circular procession.
    • Experimental setup utilizing optical vortex beams.
    • Simultaneous measurement of two rotational frequencies.

    Main Results:

    • Successful demonstration of simultaneous measurement of two rotational frequencies.
    • Validation of the interaction mechanism analysis.
    • Enhanced RDE performance for complex rotational scenarios.

    Conclusions:

    • The developed technique broadens the application scope of the rotational Doppler effect.
    • This method offers potential for remote detection of targets with complex micro-motions.
    • The findings contribute to advancements in optical metrology and sensing technologies.