Ocean current detection device and method based on double-helix and double-core vibration fiber-optic cable

An ocean current detection device based on double-helix and double-core vibration fiber-optic cable,

• wherein comprises a double-core fiber-optic cable and a φ-OTDR (Phase-Optical Time Domain Reflectometry) system;
• the double-core fiber-optic cable comprises a first optical fiber core and a second optical fiber core, provided symmetrically in the double helix structure;
• the terminate ends of the first optical fiber core and the second optical fiber core are connected to each other, providing a single channel, double helix, optical fiber;
• and the start end of the first optical fiber core or the second optical fiber core is connected with the φ-OTDR system;
• when measuring the ocean current characteristics in the target sea area, the double-core fiber-optic cable is provided underwater in the target sea area to generate vortex-induced vibration;
• and the φ-OTDR system is provided for emitting laser towards the double-core fiber-optic cable, receiving returned double-core vibration signals and extracting vibration characteristics from the double-core vibration signals to determine ocean current characteristics in the target sea area according to the vibration characteristics, including ocean current flow velocity and ocean current flow direction.