Shape monitoring of pipelineelixandre
Distributed strain sensor with optical fiber is a recent technology capable of measuring strain of offshore and onshore pipeline. A 3D layout of the fiber sensor on the all pipeline’s length is necessary to calculate global displacement of a specific portion or normal stress everywhere on its surface.
If production equipments and installations are capable of helical shape disposition around pipeline, only one optical fiber cable is necessary to measure what three optical fiber cables with straight disposition can measure.
Comparative experiment were made to compare performance of the well-known local Bragg sensor technology. Even though, strain resolution of Bragg grating (±1µdef) are better than Brillouin technology (±5µdef), distributed strain sensor gets its advantage on the number of equivalent sensor (1km of monitoring pipeline <=> 3000 local strain sensors). Ideal to cover very long pipeline (tens of kilometers).