Sensing cable for leakage monitoring of long-distance tunnels/pipelines

Abstract

The present invention discloses a sensing cable for leakage monitoring of long-distance tunnels / pipelines, which allows leakage to be converted to optical loss of optical fibers through reasonable physical design and is used for monitoring optical loss distribution along the optical fibers by utilizing the technology of the optical time domain reflection (OTDR), thereby random leakage monitoring of long-distance structure is achieved. The sensing cable provided by the invention comprises leakage-deformation conversion materials, constraining materials and sensor fibers, wherein two types of sensor fibers are arranged in the sensing cable, thereby reducing optical loss caused by other factors except leakage and improving reliability of monitoring. The sensing cable provided by the invention has the advantages of simple structure, perfect technology of OTDR, low cost, long monitoring distance and strong market competitiveness, and on-line monitoring with low cost and high precision for leakage of long-distance tunnels / pipelines is achieved, thereby national infrastructure security is guaranteed and national resources are protected.

Description

technical field [0001] The invention belongs to the technical field of engineering monitoring and sensing, and in particular relates to an optical cable which can be used for long-distance tunnel / pipe leakage monitoring. Background technique [0002] Due to the small impact on the environment during construction, shield tunnels have become the main form of traffic tunnels such as subways and river / sea crossings. However, the shield tunnel lining is spliced ​​by prefabricated reinforced concrete segments through high-strength bolts, and there are joints between the segments. Generally, tunnels are buried below the groundwater level, which is prone to water leakage. Leakage itself is not terrible, but it is mainly easy to cause corrosion of connecting bolts and degrade structural performance. For water and oil pipelines, it is also easy to cause leakage on the transportation line, resulting in waste of water and oil, and environmental pollution. Therefore, it is very import...

AI Technical Summary

Problems solved by technology

However, because these two types of structures generally have a relatively long layout distance, which can usually reach tens of kilometers or thousands of kilometers, the current existing technology is still unable to effectively implement leakage monitoring on the entire line

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