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    Area of Science:

    • Optoelectronics
    • Signal Processing
    • Nanotechnology

    Background:

    • Heterodyne interferometry is crucial for precise measurements.
    • Traditional phase demodulation schemes can be complex and costly.
    • Software-defined radio (SDR) offers a flexible platform for signal processing.

    Purpose of the Study:

    • To design and evaluate a novel phase demodulation scheme using SDR.
    • To achieve real-time phase retrieval with a low-cost system.
    • To demonstrate the system's performance in measuring nanoscale displacements.

    Main Methods:

    • Implementation of a phase demodulation scheme utilizing a low-cost SDR.
    • Integration of a wideband optoelectronic front-end for signal acquisition.
    • Real-time phase retrieval and displacement measurement.
    • Characterization of a polyvinylidene fluoride (PVDF) piezoelectric transducer.

    Main Results:

    • The SDR-based demodulator is simpler, more versatile, and lower cost than existing methods.
    • Accurate measurement of displacements ranging from 3.5 pm to 122 pm.
    • Achieved a relative uncertainty of 7% across a frequency range of 20 kHz to 1 MHz.
    • Successful demonstration of ultrasonic applications with a PVDF transducer.

    Conclusions:

    • The developed SDR phase demodulation scheme provides a practical and efficient solution for heterodyne interferometry.
    • The system's performance is suitable for precise nanoscale displacement measurements in ultrasonic applications.
    • This approach offers a cost-effective and versatile alternative for real-time phase retrieval.