Abstract
A scour monitoring method for subsea pipelines is proposed using distributed Raman optical sensors based on active thermometry to achieve distributed 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). In this paper, an industrial cable is used as the thermal cable, which can act as the heat source as well as to monitor the temperature. A DTS8000 thermodetector collects the temperature information over time. 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 the free span and length of the subsea pipeline can be detected from the different temperature change patterns during the heating and cooling process using a distributed Raman scattering technique. In this paper, we mainly focus on recognizing the interface of different media. Tests demonstrate good results in the identification of the interface using an industrial cable as a thermal cable.
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