How to connect the fiber optic vibration sensing cable

Proper connection of a fiber optic vibration sensing cable involves careful handling, correct alignment of connectors, secure fixing, and adherence to bending and splicing requirements to ensure accurate vibration detection.Choosing the Right Cable

Use single-mode optical fiber (SMF, G652 recommended) for DVS/DAS systems, as it serves both as the sensing medium and signal transmission carrier. Specialty sensor cables may include protective coatings, armored or metal-free designs, and sheathing suitable for environmental conditions such as buried or exposed installations .

Installation Methods

1. Fence-Mounted Installation:
   • Arrange the cable in a wave pattern along the fence to capture vibrations effectively.
   • Use cable ties to secure the fiber at intervals of 15–30 cm to prevent movement from wind or vibration .
   • Avoid sharp bends and maintain the minimum bending radius specified for the cable.
   • Reserve extra fiber length at splice points and protect it inside a splice box.
2. Buried Installation:
   • Dig a trench along the planned perimeter, avoiding heavy vehicle zones and drainage channels.
   • Place a bottom protection layer (plastic grid or approved support) to transfer vibrations and protect the cable.
   • Lay the fiber smoothly without twisting or heavy pulling.
   • Cover with geotextile and soil, compacting properly to maintain concealment and protection .

Connector and Splice Handling

• Align the notch of the FC/APC connector with the interface slot on the host or DAS module before connecting .
• Use a fusion splicer for joining fiber ends, ensuring splice loss remains below the required threshold to prevent weak signals or unstable detection.
• Protect splice points inside a fiber splice box to maintain signal integrity.

General Handling Tips

• Avoid sharp bends, twisting, or excessive pulling of the fiber.
• Ensure all accessories, including splice boxes, optical jumpers, and connectors, are approved for the system to maintain reliability .
• Use protective conduits, warning labels, and waterproof accessories where necessary.
• Test the system with an optical power meter after installation to verify signal quality and proper operation. By following these steps, the fiber optic vibration sensing cable will be properly connected, ensuring accurate, real-time vibration monitoring and long-term system stability .