This research reports a distributed fiber optic high-temperature sensing system tailored for applications in the steel industry and various other sectors. Recent advancements in optical sensor technology have led to the exploration of sapphire crystal fibers as a solution for sensing in harsh environments. Utilizing a femtosecond (fs) laser, cascaded fiber Bragg gratings (FBGs) were meticulously fabricated within a multimode sapphire optical fiber. These FBGs endowed the system with distributed sensing capabilities and underwent rigorous testing under extreme temperatures, reaching up to 1,800 °C. The study delves into the investigation of the FBG reflection spectrum, facilitated by the development of a sophisticated multimode demodulation system, which contributed to the attainment of precise temperature measurements with a performance accuracy of 99.9%. Demonstrating exceptional thermal stability, the sapphire FBGs endured temperatures of 1,600 °C for a sustained duration of 22 hours. Furthermore, the paper explores the application of distributed temperature sensing employing multiple sapphire FBGs, showcasing their utility in temperature measurements related to molten steel studies.
- femtosecond (fs) laser,
- Fiber Bragg gratings (FBGs),
- Fiber gratings,
- fiber sensors,
- molten steel,
- Optical fiber networks,
- Optical fiber sensors,
- sapphire optical fiber,
- Sensors,
- Steel,
- submerged entry nozzle (SEN),
- Temperature measurement,
- Temperature sensors
Available at: http://works.bepress.com/ronald-omalley/141/