Research on underwater monitoring system based on Φ-OTDR distributed fiber optic sensors

Stable operation of underwater systems is critical to economic development. However, the system is exposed to certain security risks during the long working cycle due to the complex underwater environment. Therefore, real-time dynamic monitoring of these systems is even more important. We are committed to responding to external disturbances in a timely manner and minimizing damage. In addition, we should exclude the disturbance from the water waves when monitoring, which also increases the difficulty of determining the disturbance for underwater monitoring. This paper designs an underwater monitoring system based on phase-sensitive optical time-domain reflectometer distributed fiber-optic sensor, which can make more accurate judgment of underwater disturbance. At the same time, it has the advantages of enough monitoring range, long-term working ability and large frequency response.