Research on modeling and experimentation on detecting buried depth of optical fiber submarine cables based on active detection technique

In recent years, detecting buried depth of optical fiber submarine cables is a difficult problem for the building and the maintenance of optical fiber submarine cable communication system. Based on magnetism detection method, this paper establishes the basic model of buried depth detection and designs the biorthogonal-coil depth detection method. The characteristic of the biorthogonal-coil depth detection method is that it is guaranteed that the detection signal obtains the maximum value in spite of the orientation of coils as long as the coil array is above the optical fiber submarine cable and root-mean-square value of the two coils from each group is calculated. The correctness and feasibility of the basic model and the biorthogonal coils model are validated by the experiments.