This paper presents a feasibility study on leak detection of buried pipelines using the active distributed temperature sensing (ADTS) method. The proposed solution involves the use of actively heated fiber optic (AHFO) cables arranged parallel to the pipelines, allowing for changes in the thermal properties of the surrounding soil to be captured and correlated with leakage accidents. This problem was modeled as an infinite cylindrical or linear heat source buried in porous media with seepage flowing inside. AHFO sensors were designed to verify the proposed method through scale-reduced model tests. The fiber optic temperature sensing technology based on optical frequency domain reflectometry (OFDR) was used to continuously monitor temperature profiles. The test results demonstrate that the ADTS solution has greatly improved the accuracy of passive temperature sensing methods. The feasibility of the solution was evaluated regarding different levels of leakage estimation, namely, identification, location, and quantification. This paper presents the first attempt to monitor the infiltration process associated with pipeline leaks using the AHFO-OFDR technique, which is a reliable method for structural health monitoring of underground pipelines.

本文介绍了使用主动分布式温度传感 (ADTS) 方法对埋地管道进行泄漏检测的可行性研究。拟议的解决方案涉及使用与管道平行布置的主动加热光纤 (AHFO) 电缆，允许捕获周围土壤热特性的变化并将其与泄漏事故相关联。这个问题被建模为一个无限大的圆柱形或线性热源，埋在多孔介质中，内部有渗流。AHFO 传感器旨在通过缩小比例的模型测试来验证所提出的方法。基于光频域反射计（OFDR）的光纤温度传感技术用于连续监测温度曲线。测试结果表明，ADTS解决方案大大提高了被动温度传感方法的准确性。该解决方案的可行性根据不同级别的泄漏估计进行了评估，即识别、定位和量化。本文首次尝试使用 AHFO-OFDR 技术监测与管道泄漏相关的渗透过程，这是一种可靠的地下管道结构健康监测方法。