From -269°C to +700°C: Gold-Coated Fiber, the "King of the Poles" for Ultra-High/Low Temperature Sensing

In the fields of scientific exploration and industrial manufacturing, temperature extremes often pose the greatest barrier to data transmission and sensing. Traditional optical fibers risk coating decomposition and brittle cracking when temperatures exceed 85°C or drop below -60°C. Even high-performance polyimide fibers typically reach a temperature ceiling of around 350°C.

[Beijing Dacheng Yongsheng Technology Co., Ltd. (DCYS)] offers the OFSCN® Gold-Coated Fiber, a specialized optical fiber designed to surpass these thermal limitations. With an astonishing operating range of -269°C to +700°C, it is unquestionably crowned the "King of the Poles" in ultra-high/low temperature sensing.

I. Conquering Ultra-High Heat: The Challenge of 700°C Stability

In applications such as turbine engines, high-temperature furnaces, and geothermal wells, temperatures can easily surpass the melting point of polymer coatings.

• The Metal Advantage: The gold coating is made of inert metallic gold. Unlike polymer materials, it will not thermally decompose, burn, or generate harmful gases during continuous exposure to temperatures as high as 700°C.
• Data Stability: This ensures that the fiber's geometrical structure and optical performance (such as attenuation) remain stable for the long term in extreme high-temperature environments. This is vital for Distributed Fiber Optic Sensing (DOFS) applications requiring precise temperature measurement.

II. Withstanding Ultra-Low Temperatures: -269°C Structural Assurance

Cryogenic environments (such as liquid helium and liquid hydrogen applications) pose equally severe challenges to optical fibers.

• The Challenge: At extremely low temperatures, approaching absolute zero (-273.15°C), materials undergo significant shrinkage. Traditional coatings become exceptionally brittle in the extreme cold and develop stress due to the significant thermal expansion mismatch with the silica glass, leading to fiber structure damage or fracture.
• The Gold Solution: The gold coating exhibits thermal expansion properties that are better matched to the silica glass. It provides stable and reliable protection at temperatures as low as -269°C, preventing low-temperature stress from destroying the fiber.

III. Gold Coating: Dual Assurance Beyond Temperature

The value of gold-coated fiber extends beyond its temperature range, rooted in the ultra-high reliability provided by its metallic coating.

1. Permanent Hermetic Seal: The gold coating forms a complete hermetic barrier, entirely preventing moisture, humidity, and hydrogen molecules from penetrating the fiber's glass structure.
   • Eliminates Hydrolysis: Permanently eliminates static fatigue (hydrolysis) caused by moisture, ensuring the fiber's ultra-long life in humid, high-pressure environments.
   • Eliminates Hydrogen Darkening: Completely prevents hydrogen gas from entering the core, safeguarding against the sharp increase in fiber attenuation in high-temperature, hydrogen-rich environments.
2. Superior Mechanical Strength and Inertness: Gold-coated fiber offers high tensile strength (over 100 kpsi) and is highly inert to most corrosive chemicals, making it ideal for harsh environments like oil and gas, chemical, and nuclear industries.

IV. Typical Applications: Critical Support for Polar Extremes

OFSCN® Gold-Coated Fiber is the ideal choice for the following mission-critical applications:

• Energy and Industry: Geothermal well exploration (up to 650°C), nuclear reactor monitoring, and ultra-high-temperature industrial furnaces (glass, metal).
• Aerospace and Defense: Cryogenic fuel systems for rockets, and high-temperature areas of spacecraft engines and turbines.
• Scientific Research: Ultra-low or ultra-high temperature environments in physics experiments, and superconductivity research.

Choosing OFSCN® Gold-Coated Fiber means choosing the widest temperature range and highest reliability fiber solution currently available on the market, ensuring your critical data is transmitted accurately, stably, and persistently in the most extreme environments.

[Beijing Dacheng Yongsheng Technology Co., Ltd. (DCYS)]

Official Website: https://www.ofscn.org

Product Link: https://www.ofscn.org/optical-fibers/gold-coated.html