High-speed and high-resolution YAG fiber based distributed high temperature sensing system empowered by a 2D image...

Area of Science:

• Materials Science
• Optical Sensing
• High-Temperature Engineering

Background:

• High-temperature monitoring is crucial for infrastructure like jet engines and nuclear reactors.
• Current distributed sensing systems face challenges in achieving simultaneous high speed, spatial, and temperature resolution.
• Reliable, high-performance temperature sensing is essential for safety and efficiency.

Purpose of the Study:

• To develop a Raman distributed high temperature sensing system with enhanced spatial and temperature resolution.
• To demonstrate the system's capability in extreme temperature environments.
• To overcome limitations of existing distributed sensing technologies.

Main Methods:

• Utilized a single-crystal Yttrium Aluminum Garnet (YAG) fiber for distributed sensing.
• Implemented a Raman-based temperature sensing technique.
• Employed 2D image restoration algorithms to improve signal-to-noise ratio and data processing.

Main Results:

• Achieved operation from room temperature up to 1400°C.
• Demonstrated a spatial resolution of 7 cm and a response time of 1 millisecond over a 1m YAG fiber.
• Reported an average temperature sensitivity of 7.95 × 10^-4/°C.
• Achieved a temperature standard deviation of 7.89 °C with 1 ms data and a record temperature resolution of 0.62 °C with 1s data.

Conclusions:

• The developed Raman distributed sensing system in YAG fiber offers superior spatial resolution and response time.
• The system provides reliable high-temperature monitoring capabilities critical for industrial applications.
• This breakthrough enables faster and more precise temperature measurements in demanding environments.