基于分布式光纤测温系统的管廊管道渗漏监测模型试验

In view of different leakage characteristics of integrated pipe gallery pipelines and buried pipelines, an application of distributed optical fiber temperature measurement technology was proposed to monitor the leakage of the pipeline gallery. A model test device and a monitoring system was designed to monitor and study the leakage characteristics of tap water pipes with different diameters at different locations under different ambient temperatures. The results show that for circular pipes, when the optical fiber was arranged on the left and right sides and directly under the pipe diameter section, the leakage on the section could be effectively detected. As the temperature difference between the environment and the medium in the tube increased, the temperature response of the optical fiber near the leakage point became more obvious. At the same leakage point section, when the water slided down the pipe wall from the leakage point, the temperature at the low point of the cross section was slightly higher than that at the high point. Along the water supply direction, the temperature of the distant leaking point on the pipeline was higher than that of the nearby leaking point.