Shape monitoring method of submarine cable based on fiber Bragg grating.

• This article presents an FBG-based method for submarine cable shape monitoring. • The Frenet framework is used in the paper to achieve the continuity of discrete curvature. • When the monitoring system from the article was used on the undersea landing cable, it discovered potential dangers. Submarine cables are crucial in the transmission of electricity between coastal islands. Compared with terrestrial cables, submarine cables operate under harsher environments and thus their probability of failure is higher. Therefore, the effective monitoring of submarine cables is necessary to prevent related accidents. Quasi-distributed sensing technology based on fiber Bragg gratings converts the sensing information into discrete curvature information according to the pure bending theory and subsequently reconstructs the shape of the submarine cable using discrete curvature interpolation and curve reconstruction algorithms. The fiber Bragg grating sensor is placed on the landing cable section to analyze the reconstruction effect and error, demonstrating the feasibility of the method for submarine cable monitoring. Finally, the monitoring results in extreme weather reveal potential safety hazards in the submarine landing cable. [ABSTRACT FROM AUTHOR]