Defying Strong Magnetism and Extreme Heat: Safety Applications of OFSCN® Double-Layer Stainless Steel Seamless Tube Fiber Optic Cables in Power and Extreme Conditions

In modern urban power supply and high-end industrial R&D, working conditions in cable tunnels, liquefied gas storage, and vacuum laboratories are extremely complex. Monitoring equipment must not only withstand intense electromagnetic interference but also maintain signal stability under extreme temperature fluctuations.

The Double-Layer Stainless Steel Seamless Tube Fiber Optic Cable, developed by Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®), provides a sensor carrier with high environmental tolerance for Distributed Fiber Optic Sensing (DFOS) systems through its all-metal sealed structure and high-strength design.

1. Extreme Temperature Control: From Liquid Hydrogen and Nitrogen to High Heat

In power tunnels or specialized energy storage fields, drastic temperature changes are the norm. The OFSCN® double-layer stainless steel cable exhibits excellent physical properties in extreme temperature control:

• Adaptation to Cryogenic Environments: In scientific research involving ultra-low temperatures such as liquid nitrogen (-196℃) or liquid hydrogen, ordinary polymer materials undergo low-temperature embrittlement. Stainless steel maintains stable mechanical properties at cryogenic temperatures, effectively protecting the internal fibers from micro-bending losses.
• Thermal Conductivity and Stability: For monitoring localized overheating in high-voltage cable joints, standard models of this cable support operating environments up to 300℃. With specialized fibers, it can even withstand short-term high-temperature shocks up to 700℃. The all-metal structure ensures that heat is rapidly transferred to the optical fiber, improving the response speed of fire warning systems.

2. Vacuum Sealing and High Airtightness Assurance

In semiconductor manufacturing, aerospace simulation, and high-end physics experiments, fiber optic cables often need to penetrate vacuum chamber walls.

• Double-Layer Laser Welding Process: OFSCN® utilizes a structure of two nested and independently welded seamless steel tubes, forming two reliable airtight defense lines. This "tube-in-tube" design significantly reduces the probability of leakage caused by a defect in a single weld.
• Permeation Resistance: For environments requiring high vacuum or strictly restricted gas compositions, the metal sealing layers effectively block the permeation of small molecules such as H2 and O2. This ensures that the internal fibers are not chemically contaminated while maintaining the purity of the external environment.

3. Magnetic Shielding and Flame Retardancy in Power Tunnels

High-voltage cable tunnels are typical strong electromagnetic environments that also demand extremely high fire ratings.

• Electromagnetic Interference (EMI) Resistance: As an all-metal sheathed cable, the double-layer stainless steel structure provides natural physical shielding for the internal fiber signals, reducing potential interference from complex electromagnetic fields on sensing sensitivity.
• Intrinsic Safety and Non-combustibility: Stainless steel is inherently non-combustible and does not support combustion. In the event of an accidental arc or the early stages of a fire, the double-layer metal tubes provide valuable physical protection time, allowing the monitoring system to continue outputting data and assisting maintenance personnel in accurately locating the fault point.

4. A Reliable Foundation for Structural Health Monitoring

Compared to traditional single-layer SST cables, the OFSCN® double-layer structure provides higher mechanical redundancy:

• Crush and Tensile Resistance: During the complex laying process in power pipe galleries, cables are inevitably subjected to traction and lateral pressure. The double-layer structure distributes stress more uniformly.
• Reduced Maintenance Frequency: By improving the survival rate of the cable in harsh environments, this product helps reduce the risk of monitoring system downtime caused by sensor failure, effectively assisting maintenance teams in improving management efficiency.

5. Summary

Whether facing the cryogenic tests of liquid hydrogen and nitrogen or the high-heat and strong magnetic challenges of power tunnels, the double-layer stainless steel seamless tube fiber optic cable from Beijing Dacheng Yongsheng Technology Co., Ltd. (OFSCN®) demonstrates immense engineering value. It does not chase an illusory "permanence" but provides high-reliability monitoring support for every critical project through solid material mechanics and sealing craftsmanship.

• 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 Advantages: Double-layer full sealing, extreme temperature resistance, vacuum compatibility, high mechanical strength.