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Rotation velocity measurement based on a self-mixing grating interferometer.

Taiji Dong, Bingkun Gao, Chen Qing

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    Summary
    This summary is machine-generated.

    A new method uses a self-mixing grating interferometer to measure rotational velocity via Doppler frequency shift. This technique achieves high accuracy with relative errors under 0.5%.

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    Area of Science:

    • Optics and Photonics
    • Metrology and Measurement Science

    Background:

    • Accurate measurement of rotational velocity is crucial in various scientific and industrial applications.
    • Existing methods may require complex setups or precise angle measurements.

    Purpose of the Study:

    • To introduce and validate a novel rotational velocity measurement technique.
    • To demonstrate the effectiveness of the self-mixing grating interferometer (SMGI) for this application.

    Main Methods:

    • Development of a measurement principle based on Doppler frequency shift analysis.
    • Utilizing a self-mixing grating interferometer (SMGI) to detect velocity-induced frequency shifts.
    • Employing power spectrum analysis for Doppler frequency extraction, eliminating the need for incident angle measurement.

    Main Results:

    • Successful measurement of target object rotational velocity using the SMGI.
    • Demonstrated extraction of Doppler frequency shift through power spectrum analysis.
    • Achieved high measurement accuracy with relative errors consistently below 0.5%.

    Conclusions:

    • The proposed SMGI-based method offers a simple and accurate approach for rotational velocity measurement.
    • The technique's ability to forgo incident angle measurements simplifies experimental procedures.
    • The demonstrated low error rates highlight the method's practical viability.