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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Quasi-distributed acoustic sensing based on optical path difference demodulation for high-frequency and

Hongkun Zheng, Lingmei Ma, Caiyun Li

    Optics Letters
    |November 1, 2024
    PubMed
    Summary

    This study introduces an optical path difference (OPD) demodulation method for distributed acoustic sensing (DAS). The novel approach enhances bandwidth by 100 times, improving dynamic range and signal frequency capabilities.

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    Area of Science:

    • Optics
    • Fiber Optics
    • Sensing Technology

    Background:

    • Phase-sensitive optical time domain reflectometry (OTDR) is crucial for distributed acoustic sensing (DAS).
    • Existing OTDR schemes face limitations in balancing dynamic range and signal frequency.
    • A need exists for advanced demodulation techniques to overcome these trade-offs.

    Purpose of the Study:

    • To introduce and validate a novel optical path difference (OPD) demodulation method for distributed acoustic sensing (DAS).
    • To address the dynamic range and signal frequency limitations inherent in current phase-sensitive OTDR systems.
    • To demonstrate the application of OPD demodulation to an interferometer array for enhanced acoustic sensing.

    Main Methods:

    • An interferometer array comprising an ultra-weak fiber Bragg grating (UWFBG) array and an imbalanced Michelson interferometer was utilized.
    • Frequency-modulated pulses were employed to interrogate the UWFBG array.
    • The variation of residual optical path difference (OPD) was demodulated to retrieve acoustic signals between adjacent UWFBGs.

    Main Results:

    • The proposed OPD demodulation method was theoretically analyzed and experimentally validated.
    • A 100-fold increase in bandwidth was achieved for a 0.4 µε amplitude signal compared to phase demodulation methods.
    • Increasing signal-to-noise ratios were observed as signal frequency increased.

    Conclusions:

    • The novel OPD demodulation method effectively overcomes the dynamic range and signal frequency trade-off in DAS.
    • This technique offers a significant advancement in bandwidth for acoustic sensing applications.
    • The method demonstrates potential for improved performance in distributed acoustic sensing systems.