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High-performance accelerometer array with chirped pulse modulation using reference interferometric architecture.

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    This study presents a novel optical fiber disk accelerometer using chirped pulse demodulation for precise acceleration measurement. The system achieves superior performance with enhanced signal-to-noise ratio and expanded dynamic range, improving accuracy and noise suppression.

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    Area of Science:

    • • Optical Engineering
    • • Sensor Technology
    • • Signal Processing

    Background:

    • • Limitations in current accelerometer technology include noise and limited dynamic range.
    • • Optical fiber sensors offer potential for high-precision measurements but require advanced signal processing.
    • • Laser source fluctuations and environmental noise impact accelerometer performance.

    Purpose of the Study:

    • • To demonstrate a high-performance optical fiber disk accelerometer.
    • • To improve acceleration measurement precision and noise suppression.
    • • To enhance signal-to-noise ratio (SNR) and dynamic range.

    Main Methods:

    • • Employed chirped pulse demodulation with a reference interferometer architecture.
    • • Utilized matched-filter processing for enhanced SNR and spatial resolution.
    • • Implemented a second-order time-domain difference unwrapping (TDU) algorithm.

    Main Results:

    • • Achieved a sensitivity of 30.97 rad/g over a 5-800 Hz bandwidth.
    • • Demonstrated 12.84 dB phase noise reduction in the 1-20 Hz range.
    • • Exhibited a high-frequency noise floor of -105 dB re g²/Hz, outperforming IQ demodulation by 15 dB.
    • • Expanded dynamic range from 85.93 dB to 106.59 dB using the TDU algorithm.

    Conclusions:

    • • The proposed optical fiber accelerometer with chirped pulse demodulation offers high precision and effective noise suppression.
    • • The system demonstrates superior performance metrics compared to conventional methods.
    • • The enhanced dynamic range facilitates distortion-free acceleration detection across extended spectral bandwidths.