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Related Experiment Video

Updated: Jul 9, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils
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Inversion method for soil moisture content based on a distributed fiber optic acoustic sensing system.

Ying Shang, Qiujie He, Sheng Huang

    Optics Express
    |November 29, 2023
    PubMed
    Summary

    This study introduces a new method for real-time soil moisture content (SMC) monitoring in two-dimensional areas using distributed acoustic sensing (DAS). The technique accurately measures SMC by analyzing seismic wave sound velocity, offering a significant advancement over traditional methods.

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    Area of Science:

    • Geophysics
    • Soil Science
    • Remote Sensing

    Background:

    • Traditional soil moisture content (SMC) methods lack real-time, two-dimensional monitoring capabilities.
    • Accurate SMC data is crucial for various applications, including agriculture and environmental management.

    Purpose of the Study:

    • To develop and validate a rapid SMC monitoring method for two-dimensional areas.
    • To leverage distributed acoustic sensing (DAS) for enhanced soil moisture assessment.

    Main Methods:

    • Utilized distributed acoustic sensing (DAS) to demodulate backward Rayleigh scattering signals from an active seismic source.
    • Employed the folding ruler approximation to calculate soil sound velocity.
    • Inverted sound velocity data to determine soil moisture content (SMC).
    • Configured a 3x10 m two-dimensional area with sensing optical cable and seismic source for measurement.

    Main Results:

    • Successfully inverted soil sound velocity to determine SMC within the 15%-40% range.
    • Achieved an absolute error of 7% compared to a water cut meter.
    • Demonstrated the feasibility of using Rayleigh scattering properties for SMC inversion.

    Conclusions:

    • Distributed acoustic sensing (DAS) provides a viable new method for real-time, large-area SMC monitoring.
    • The proposed method overcomes limitations of traditional soil moisture measurement techniques.