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Quadrature detection for self-mixing interferometry.

Junfeng Wu, Fengfeng Shu

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    Summary
    This summary is machine-generated.

    A novel quadrature detection system for self-mixing interferometry simplifies vibration measurement. This method uses a rotating beam splitter and two photodiodes for easier displacement demodulation.

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    Area of Science:

    • Optics and Photonics
    • Measurement Science and Instrumentation

    Background:

    • Self-mixing interferometry (SMI) is a technique for measuring displacement and vibration.
    • Traditional SMI signal demodulation can be complex, requiring sophisticated algorithms.

    Purpose of the Study:

    • To develop a simplified quadrature detection system for self-mixing interferometry.
    • To improve the ease of demodulating vibration information from SMI signals.

    Main Methods:

    • A new system employing a 22.5-degree rotated beam splitter and two photodiodes was established.
    • The rotating beam splitter generates two quadrature self-mixing signals.
    • An arctangent phase algorithm is used for signal demodulation.

    Main Results:

    • The proposed method successfully obtains quadrature self-mixing signals.
    • Vibration information and displacement were demodulated more easily.
    • Experimental results confirmed the feasibility of the quadrature detection system.

    Conclusions:

    • The developed quadrature detection system simplifies self-mixing interferometry signal processing.
    • This approach offers a practical method for optical measurement of object vibration.
    • The findings provide valuable guidance for designing self-mixing interferometers.