Specifications for High-Temperature Temperature Measuring Optical Cables in South Korea

High-temperature optical fiber cables for distributed temperature sensing can operate up to 1900°C using sapphire fibers, with options for metallic or armored protection for harsh industrial environments.Cable Types and MaterialsHigh-temperature optical cables are designed to withstand extreme conditions, including high temperatures, corrosive environments, and electromagnetic interference. Common types include:Sapphire-based fibers: Capable of measuring temperatures up to 1900°C, ideal for ultra-high temperature applications such as gas turbines, steel production, and nuclear reactors. These fibers are often integrated with Fabry-Perot cavities or Fiber Bragg Gratings (FBGs) for precise temperature measurement and high stability (±1°C at 1100°C) over prolonged periods .Silica fibers: Suitable for temperatures below 1000°C, but prolonged exposure above this range can cause structural changes and measurement drift .Metallic or armored fibers: Provide mechanical protection, crush resistance, and strain tolerance, suitable for long-distance deployment in industrial plants .Sensing PrinciplesHigh-temperature optical cables use various interrogation techniques:Raman scattering: Common for distributed temperature sensing over long distances, providing high-resolution temperature profiles without electrical interference .Brillouin and Rayleigh scattering: Used for distributed sensing in pipelines, kilns, and chemical plants .Fiber Bragg Gratings (FBGs): Enable multiplexed point measurements along a single fiber, suitable for high-definition temperature mapping .Operating Temperature RangesStandard high-temperature fibers: Up to 1000°C (silica-based)Sapphire fibers: Up to 1900°C, with high stability and resolution (