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Cable Tunnel Temperature Sensing Optical Cable

Fiber and communications infrastructure knowledge brief Published 25 Jan 2024

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Fiber optic DTS cables provide continuous, high-resolution temperature monitoring along cable tunnels, enabling early fire detection and thermal management.

Overview of DTS Technology

Distributed Temperature Sensing (DTS) systems use standard optical fibers as linear temperature sensors to monitor temperature along the entire length of a cable, often spanning several kilometers. The technology relies on Raman or Brillouin optical scattering, where a laser pulse is sent through the fiber and the backscattered light is analyzed to determine temperature at specific points along the cable. The position of each temperature reading is calculated using Optical Time Domain Reflectometry (OTDR) or Optical Frequency Domain Reflectometry (OFDR), providing spatial resolution down to 1 meter.

Applications in Cable Tunnels

In cable tunnels, DTS optical cables are used to: Monitor power and communication cables for overheating or fire hazards. Detect hot spots in real time, allowing preventive or corrective actions before damage occurs. Provide continuous coverage along the tunnel, unlike conventional point-based sensors, ensuring no gaps in monitoring.

Operate safely in high electromagnetic fields and hazardous areas, as the system is passive and immune to interference.

Optical Cable Design

Specialized temperature sensing optical cables for tunnels, such as the SCJKBH-T-03L DTS MM cable, feature: Spiral armored tubes for mechanical protection. Reinforcement with aramid and metal wire weaving. Outer protection with low smoke, halogen-free, flame-retardant materials.

Single-mode or multimode fibers with excellent Raman scattering characteristics for accurate temperature measurement. Compatibility with dedicated DTS equipment for real-time monitoring and system integration.

Advantages of Fiber Optic DTS in Tunnels

Early detection: Identifies temperature rise before reaching critical levels. High accuracy: Temperature readings within ±1°C and hot spot localization within 1 meter. Low maintenance: Passive fiber with no moving parts, corrosion-free, and long service life.

Scalability: Can monitor long tunnel sections (up to 10 km or more) with thousands of measurement points. Versatility: Suitable for industrial, petrochemical, steel, coal, and large building applications.

Installation Considerations

Cables should be fixed at recommended distances (typically 1. 5 meters apart) from the ceiling or cable trays to ensure accurate temperature detection. Pre-alarm levels can be set for individual cable tray risks, allowing customized fire detection thresholds.

The system can be integrated with fire alarm and building management systems for automated response.

Conclusion

Using fiber optic DTS cables in cable tunnels provides a reliable, continuous, and high-resolution method for temperature monitoring and early fire detection. The combination of robust cable design, precise measurement, and real-time monitoring ensures enhanced safety, asset protection, and operational efficiency in critical infrastructure environments.

Cable Tunnel Temperature Sensing Optical Cable - ENSAA OPTICAL NETWORKS [PDF]

Cable Tunnel Temperature Sensing Optical Cable

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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