Pipeline, serving as one of the most important gas transportation methods, can cause serious consequences in the event of leakage, so leakage monitoring is particularly important. In our previous study, a fiber Bragg grating hoop strain sensor was developed to detect pipeline leakage by measuring circumferential strain, and this sensor was utilized in a liquid pipeline leakage test to verify its performance. In this article, we established a full-scale gas pipeline model and investigated the performance of this fiber Bragg grating hoop strain sensor in leakage monitoring. On the basis of circumferential strain variation characteristic before and after negative pressure wave arrival at a fiber Bragg grating hoop strain sensor, a linear fitting algorithm combined with threshold detection was proposed to capture the knee point of circumferential strain. Test results illustrated that the proposed approach has good performance in knee point detection, and fiber Bragg grating hoop strain sensor is suitable for gas pipeline leakage monitoring.

管道是最重要的气体传输方法之一，一旦发生泄漏会造成严重后果，因此泄漏监测尤为重要。在我们先前的研究中，开发了一种光纤布拉格环箍应变传感器，以通过测量周向应变来检测管道泄漏，并将该传感器用于液体管道泄漏测试中以验证​​其性能。在本文中，我们建立了一个完整的天然气管道模型，并研究了该光纤布拉格光栅箍应变传感器在泄漏监测中的性能。根据负压波到达光纤布拉格环箍应变传感器之前和之后的周向应变变化特性，提出了一种结合阈值检测的线性拟合算法来捕获圆周应变的拐点。测试结果表明，该方法在拐点检测中具有良好的性能，光纤布拉格环箍应变传感器适用于天然气管道泄漏监测。