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Interferometric sensor with a PGC-AD-DSM demodulation algorithm insensitive to phase modulation depth and light

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    A novel interferometric sensor uses differential-self-multiplication (DSM) and asymmetric division to eliminate carrier modulation depth and light intensity disturbances. This advanced sensor shows significant improvements in signal-to-noise ratio for enhanced performance.

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    Area of Science:

    • Optical Sensing
    • Signal Processing
    • Interferometry

    Background:

    • Interferometric sensors are crucial for precise measurements but are susceptible to disturbances.
    • Existing demodulation algorithms like PGC-Arctan and PGC-DCM have limitations in handling carrier modulation depth and light intensity fluctuations.
    • Phase-generated carrier (PGC) techniques are widely used but require robust algorithms for practical applications.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel interferometric sensor employing asymmetric division and differential-self-multiplication (PGC-AD-DSM) demodulation.
    • To eliminate the influence of carrier modulation depth (C) on demodulation results.
    • To mitigate the impact of light intensity disturbances on sensor performance.

    Main Methods:

    • Development of a PGC-AD-DSM demodulation algorithm based on fundamental frequency mixing.
    • Implementation of asymmetric division to suppress light intensity noise.
    • Utilizing differential-self-multiplication to eliminate the carrier modulation depth effect.
    • Experimental validation of the proposed algorithm's effectiveness.

    Main Results:

    • The proposed PGC-AD-DSM algorithm successfully eliminated the influence of carrier modulation depth (C) on demodulation.
    • Asymmetric division effectively removed the impact of light intensity disturbances.
    • The sensor achieved a signal-to-noise and distortion ratio (SNDR) gain of 7.77 dB over PGC-Arctan and 9.48 dB over PGC-DCM.

    Conclusions:

    • The PGC-AD-DSM demodulation algorithm offers a robust solution for interferometric sensing.
    • The proposed method significantly enhances the signal-to-noise and distortion ratio, outperforming existing techniques.
    • This advancement holds promise for more reliable and accurate optical sensing applications.