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<p>This study investigates the application of plastic optical fiber (POF) technology in geological engineering, especially for monitoring soil moisture at real-time during water infiltration. Characterized by high sensitivity and stability, POF sensors offer a new solution to accurate measurement of in-situ water contents at specific points in soils. In this study, a series of tests were first performed using a POF sensor to measure changes in light intensity with changes in the saturation degree of three types of soils with various densities. Moreover, soil column infiltration tests were conducted to simulate practical scenarios. As a result, it was confirmed that the change in light intensity detected by the POF sensor is linearly related to soil moisture. Additionally, it was found that the performance of the POF sensor allows for more detailed measurements at specific points than the widely used ECH2O EC5 soil moisture sensor. These features make the POF technology particularly useful for monitoring micro-changes in soil moisture, which are important for early landslide prediction. This study also presents significant potential for integrating the POF sensors into field applications, providing a reliable tool for disaster prevention and infrastructure safety.</p>

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Innovative optical fiber technique for soil moisture monitoring based on light intensity variation

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Depu Hu,
  • De’an Sun,
  • Qianhao Yue,
  • Shoji Kato,
  • Byeong-Su Kim

摘要

This study investigates the application of plastic optical fiber (POF) technology in geological engineering, especially for monitoring soil moisture at real-time during water infiltration. Characterized by high sensitivity and stability, POF sensors offer a new solution to accurate measurement of in-situ water contents at specific points in soils. In this study, a series of tests were first performed using a POF sensor to measure changes in light intensity with changes in the saturation degree of three types of soils with various densities. Moreover, soil column infiltration tests were conducted to simulate practical scenarios. As a result, it was confirmed that the change in light intensity detected by the POF sensor is linearly related to soil moisture. Additionally, it was found that the performance of the POF sensor allows for more detailed measurements at specific points than the widely used ECH2O EC5 soil moisture sensor. These features make the POF technology particularly useful for monitoring micro-changes in soil moisture, which are important for early landslide prediction. This study also presents significant potential for integrating the POF sensors into field applications, providing a reliable tool for disaster prevention and infrastructure safety.