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Frequency shift estimation technique near the hotspot in BOTDA sensor.

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    This summary is machine-generated.

    A new fitting technique reduces Brillouin frequency shift (BFS) errors in Brillouin optical time domain analysis (BOTDA) systems. This method accurately estimates BFS near hotspots by accounting for distorted Brillouin gain spectrum (BGS), improving measurement accuracy.

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    Area of Science:

    • Optical fiber sensing
    • Signal processing in optical systems

    Background:

    • Brillouin optical time domain analysis (BOTDA) systems measure temperature and strain using Brillouin frequency shift (BFS).
    • Hotspots in BOTDA systems cause distorted Brillouin gain spectrum (BGS), leading to significant BFS uncertainty and measurement errors.
    • Conventional fitting methods fail to accurately estimate BFS near hotspots due to distorted BGS.

    Purpose of the Study:

    • To propose and validate a novel fitting technique for accurately estimating BFS in BOTDA systems with hotspots.
    • To mitigate the BFS error caused by distorted BGS near hotspots.
    • To improve the spatial resolution and accuracy of BOTDA measurements in the presence of hotspots.

    Main Methods:

    • A fitting technique was developed to analyze the combined contributions of hotspot and ambient segments to the BGS.
    • The proposed method reconstructs the distorted BGS near hotspots.
    • The technique was compared against conventional Lorentzian and dual Lorentzian fitting schemes.

    Main Results:

    • The proposed fitting technique significantly reduced BFS error around hotspots compared to conventional methods.
    • The technique effectively recovers the distorted BGS, enabling more accurate BFS evaluation.
    • The method demonstrates improved performance in addressing BFS uncertainty caused by localized temperature or strain variations.

    Conclusions:

    • A novel fitting technique effectively addresses BFS errors in BOTDA systems with hotspots.
    • Accurate BGS analysis is crucial for reliable BFS measurements in non-uniform environments.
    • The proposed method offers a significant advancement for precise optical fiber sensing applications.