为实现海底管道冲刷悬空监测问题,提出一种基于主动加热测温法的海底管道冲刷监测技术,该技术包括3部分:热缆、数据采集单元、数据处理单元.用工业光缆作为主动加热传感带,既可通过加热提供线热源又可感测温度,用DTS 8000拉曼测温仪采集数据,然后使用计算机进行数据处理.海底管道冲刷悬空后周围介质由沉积物变为水,鉴于2种介质的温度传播机理不同,利用拉曼散射技术测量加热和冷却过程中管道周围温度的变化可识别管道悬空及悬空段长度.数值模拟及试验结果均证明该系统的可行性和精确性,利用工业光缆作为加热传感带更加接近实际应用.%A scour monitoring method for subsea pipelines is proposed based on active thermometry to achieve monitoring of the scour and free span of a subsea pipeline.The method consists of three parts:a thermal cable,a Data Acquisition Unit(DAU),and a Data Processing Unit(DPU).An industrial cable is used as the thermal cable,which can act as the heat source and monitor the temperature.The temperature information is collected by a DTS 8 000 thermo detector and the data areprocessed by computers.The surroundings of the subsea pipeline turn from sediment into seawater when scour and free span occur.The heat transfer properties are different between the two media,and frees pan and length of the subsea pipeline are detected from different temperature change patterns during the heating and cooling process using a distributed Raman scattering technique.The feasibility and accuracy of the system is verified by numerical simulation and test results.The industrial optical cable is used as heating sensing belt,which is more practical.
展开▼
