Strengthening Structural Security Foundations: Applications of OFSCN® Double-Layer Stainless Steel Seamless Tube Fiber Optic Cables in Infrastructure Monitoring

In the Structural Health Monitoring (SHM) of critical infrastructure such as hydraulic dams, rail transit tunnels, and large-scale bridges, the survival rate of the monitoring system is a core metric of concern for the engineering community. Since fiber optic cables are difficult to replace once embedded within concrete structures, their environmental durability directly dictates the continuity of monitoring data.

The Double-Layer Stainless Steel Seamless Tube Fiber Optic Cable, developed by Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®), provides a more resilient carrier solution for sensing and monitoring under complex working conditions through a high-redundancy structural design.

1. Double-Layer Protection Design: Enhancing Damage Redundancy

At infrastructure construction sites, fiber optic cables must endure high-intensity operations such as rebar tying, concrete pumping, and vibration. Compared to single-layer protection, the OFSCN® double-layer stainless steel seamless tube cable offers significant physical advantages:

• Tiered Compression Structure: Utilizing a nested "tube-in-tube" design, the cable's crush resistance is significantly enhanced. This structure effectively disperses localized concentrated stresses generated during construction, reducing the risk of damage to the internal fibers.
• Multiple Sealing Barriers: Both layers of the stainless steel tubes utilize laser welding technology, forming two physical sealing lines. Even if the outer tube suffers localized chemical erosion or mechanical damage in extreme environments, the inner tube continues to provide a sealed environment for the fibers, effectively extending the system's service life.

2. Addressing Complex Environments: Corrosion Resistance and Thermal Stability

The chemical environment inside concrete and the erosion from groundwater are critical factors affecting the long-term stability of fiber optic cables.

• Material Stability: OFSCN® offers 316L stainless steel or higher-grade corrosion-resistant alloys. These materials effectively resist chloride ion penetration and alkaline environment corrosion, ensuring that the cable's mechanical properties do not easily deteriorate under complex chemical conditions.
• Environmental Adaptability: The cable is designed for a wide operating temperature range; standard models can handle environmental changes from -200℃ to 300℃. Whether monitoring the hydration heat of dam concrete or providing tunnel fire warnings, the all-metal structure offers superior thermal conductivity and physical stability, avoiding the sudden performance shifts seen in polymer materials when exposed to high heat.

3. Optimizing Distributed Sensing Accuracy

As a carrier for distributed fiber optic sensing systems (such as DTS temperature sensing and DAS vibration sensing), the OFSCN® double-layer stainless steel cable balances physical strength with signal acquisition accuracy:

• Consistency in Stress Transfer: The compact structure of the stainless steel tubes allows minute deformations of the structural body to be transferred more directly to the internal fibers, improving the sensitivity of Distributed Strain Sensing (DSS).
• Airtight Hydrogen Protection: The metal sealing layers significantly reduce the permeation rate of molecules such as hydrogen (H2) into the fiber interior. This mitigates attenuation increases caused by "hydrogen darkening," helping to maintain the stability of long-distance sensing signals.

4. Summary:

Major infrastructure projects demand monitoring equipment characterized by "high reliability" and "low maintenance." Through the dual redundancy of its physical structure, the double-layer stainless steel seamless tube fiber optic cable from Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) effectively improves the survival rate of monitoring systems in harsh conditions, providing robust hardware support for structural safety monitoring.

• Company Name: Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®)
• Official Website: https://www.ofscn.org
• Product Details: https://www.ofscn.org/sst-cables/two-layer.html
• Core Fields: High-reliability fiber optic sensing, Structural Health Monitoring (SHM) in extreme environments.