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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...
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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Updated: May 8, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Range-scalable distributed acoustic sensing with EDFA repeaters demonstrated over 2227 km.

Erlend Rønnekleiv, Trygve Sørgård, Dmitry Klimentov

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    Summary
    This summary is machine-generated.

    We present a novel distributed acoustic sensing (DAS) system that leverages existing subsea telecom infrastructure for long-distance monitoring. This scalable solution achieves high resolution and low noise across a 2227 km fiber optic network.

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    Area of Science:

    • Fiber optic sensing
    • Acoustic monitoring
    • Telecommunications technology

    Background:

    • Long-haul fiber optic networks are crucial for telecommunications.
    • Distributed Acoustic Sensing (DAS) offers valuable monitoring capabilities.
    • Integrating DAS with existing infrastructure presents technical challenges.

    Purpose of the Study:

    • To demonstrate a range-scalable repeatered distributed acoustic sensing (DAS) solution.
    • To leverage existing long-haul subsea telecom networks for DAS.
    • To achieve low noise and high spatial/temporal resolution in DAS.

    Main Methods:

    • Utilizing a single-ended DAS interrogation system.
    • Deploying the system over a 2227 km fiber line with 39 repeatered spans.
    • Implementing wavelength division multiplexing (WDM) for multiple DAS channels.
    • Employing add/drop (A/D) multiplexers for span addressing.

    Main Results:

    • Achieved 10 m spatial resolution.
    • Operated at a 1.78 kHz sampling rate.
    • Obtained a strain resolution of 35 pε/√Hz for the outermost span.
    • Demonstrated < -60 dB crosstalk between spans using A/D multiplexers.

    Conclusions:

    • The developed DAS solution is range-scalable and compatible with existing subsea telecom infrastructure.
    • The system achieves high performance metrics, including low noise and high resolution.
    • Wavelength multiplexing and A/D multiplexers enable efficient and selective span monitoring.