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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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MI-MZI based distributed optical fiber sensor for location and pattern recognition.

Shu Zhang, Yixiao Ma, Xin Lai

    Optics Express
    |April 4, 2024
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    Summary
    This summary is machine-generated.

    A new fiber optic sensor combines Michelson and Mach-Zehnder interferometers for precise, blind-spot-free positioning. This advanced distributed sensor achieves high accuracy in disturbance detection and pattern recognition.

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    Area of Science:

    • Photonics and Optical Sensing
    • Signal Processing and Machine Learning

    Background:

    • Conventional hybrid structures for fiber optic sensors present limitations in positioning accuracy and frequency response.
    • Existing processing techniques often lead to complex designs and potential blind spots in detection.

    Purpose of the Study:

    • To introduce a novel distributed fiber optic sensor employing a hybrid Michelson and Mach-Zehnder interferometer.
    • To overcome the drawbacks of conventional methods by achieving blind-spot-free positioning and a wide response frequency.

    Main Methods:

    • Utilized a 3x3 optical coupler for demodulating two phase signals from the hybrid interferometer.
    • Applied cross-correlation techniques for disturbance localization and Markov Transition Fields to convert phase signals into 2D images.
    • Employed a neural network for pattern recognition on the generated image dataset.

    Main Results:

    • Verified the sensor's wide frequency response capacity.
    • Achieved accurate positioning within a 0-30 km range with a location error of ±85 m.
    • Demonstrated a 98.74% accuracy in a six-category pattern recognition task.

    Conclusions:

    • The proposed hybrid interferometer sensor offers a robust solution for distributed sensing with enhanced positioning capabilities.
    • The integration of signal processing and machine learning (neural networks) significantly improves pattern recognition accuracy.
    • This novel sensor design presents a promising advancement for applications requiring precise and reliable disturbance detection in fiber optic systems.