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Related Experiment Video

Updated: Jan 19, 2026

Real-time Flight Control: Embedded Sensor Calibration
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Real-time self-calibration PGC-Arctan demodulation algorithm in fiber-optic interferometric sensors.

Zhiyu Qu, Shuai Guo, Changbo Hou

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    A new self-calibrating algorithm for fiber-optic interferometric sensors improves accuracy by automatically adjusting the phase modulation depth. This fiber-optic sensor enhancement overcomes environmental variations, preventing demodulation failure and distortion.

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    Area of Science:

    • Optoelectronics and Sensor Technology
    • Signal Processing

    Background:

    • Fiber-optic interferometric sensors (FOISs) are crucial for applications like seismometers and hydrophones.
    • The phase-generated carrier arctangent (PGC-Arctan) demodulation algorithm is a key technique for FOISs.
    • Conventional PGC-Arctan requires a precise phase modulation depth (C), which fluctuates with environmental factors, causing distortion and failure.

    Purpose of the Study:

    • To introduce a novel self-calibrating PGC-Arctan (PGC-Arctan-SC) demodulation algorithm.
    • To enable accurate estimation and real-time calibration of the phase modulation depth (C) in FOISs.
    • To suppress nonlinear distortion and improve the performance of FOISs.

    Main Methods:

    • Developed the PGC-Arctan-SC algorithm for joint estimation of C using elliptical parameters.
    • Employed an ellipse fitting algorithm (EFA) to suppress nonlinear distortion.
    • Utilized a closed-loop proportion integration differentiation (PID) module for C calibration.

    Main Results:

    • Simulation results align with theoretical analysis, validating the algorithm's effectiveness.
    • An all-digital PGC-Arctan-SC demodulation system was successfully implemented on an embedded SoC.
    • Experimental results demonstrate accurate real-time estimation and calibration of C, achieving a signal-to-noise and distortion ratio (SINAD) of 61.57 dB.

    Conclusions:

    • The PGC-Arctan-SC algorithm effectively addresses the limitations of conventional PGC-Arctan demodulation.
    • The proposed method ensures robust and accurate performance of FOISs under varying environmental conditions.
    • This advancement offers a significant improvement for high-precision fiber-optic sensing applications.