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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...
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Real-time distributed fiber microphone based on phase-OTDR.

Carolina Franciscangelis, Walter Margulis, Leif Kjellberg

    Optics Express
    |January 7, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates an optical fiber as a real-time distributed microphone using phase-OTDR. The system achieves ~60 cm spatial resolution for detecting sound, including voice, along a 300m fiber.

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    Area of Science:

    • Photonics and Sensing Technology
    • Acoustic Wave Detection
    • Fiber Optic Sensing

    Background:

    • Traditional microphones have limitations in distributed sensing.
    • Optical Time-Domain Reflectometry (OTDR) offers potential for real-time monitoring.
    • Phase-OTDR (P-OTDR) is sensitive to external perturbations.

    Purpose of the Study:

    • To demonstrate the feasibility of using a standard optical fiber as a real-time distributed microphone.
    • To develop a P-OTDR system with direct detection for acoustic wave recovery.
    • To achieve high spatial resolution in fiber optic acoustic sensing.

    Main Methods:

    • Implementation of a phase-OTDR system with direct detection.
    • Integration of a sample-and-hold circuit for receiver tuning and real-time signal recovery.
    • Testing with sinusoidal disturbances, music, and human voice signals.

    Main Results:

    • Successful operation of the optical fiber as a distributed microphone.
    • Real-time recovery of acoustic waves detected along the fiber.
    • ~60 cm spatial resolution achieved over a 300 m optical fiber length.
    • Demonstrated detection of variable frequency sinusoidal signals, music, and human voice.

    Conclusions:

    • The developed P-OTDR system effectively functions as a real-time distributed microphone.
    • The system offers a practical solution for high-resolution acoustic sensing using existing fiber infrastructure.
    • This technology has potential applications in surveillance, structural health monitoring, and security.