论文部分内容阅读
针对φ-OTDR光纤分布式扰动传感器偏振衰落导致漏报的问题,提出了一种基于空间域差分的定位方法。在不增加光路器件的情况下,在空间域对探测光强进行差分处理,与现有时域定位方法相结合,通过在时域和空间域分别设置报警阈值,可以有效抑制偏振衰落导致的漏报。对提出的定位方法进行了实验验证,在空间分辨率为50 m、光纤长度为25.05 km的条件下进行多次实验测试,与现有单一时域定位方法相比,漏报率从18.5%降低到2%,报警准确率从76%提高至89%。该研究工作可以为优化和提高φ-OTDR光纤分布式扰动传感器在实际应用中的技术性能提供理论指导和技术参考。
Aiming at the problem of omission caused by polarization fading of φ-OTDR optical fiber distributed disturbance sensor, a positioning method based on spatial domain difference is proposed. Without increasing the optical path device, differential processing of the probe light intensity in the space domain and the combination of the existing time domain positioning method can effectively suppress the false negative caused by the polarization fading by setting alarm thresholds in the time domain and the spatial domain respectively . The proposed method is validated experimentally and tested several times at a spatial resolution of 50 m and an optical fiber length of 25.05 km. Compared with the existing single time-domain positioning method, the false negative rate dropped from 18.5% To 2%, alarm accuracy increased from 76% to 89%. The research work can provide theoretical guidance and technical reference for optimizing and improving the technical performance of φ-OTDR optical fiber distributed disturbance sensors in practical applications.