C-type two-thermocouple sensor design between 1000 and 1700 °C.

Area of Science:

• Thermocouple technology
• High-temperature measurement
• Transient temperature analysis

Background:

• Single thermocouples exhibit limited consistency for multi-point temperature field measurements in transient ultra-high-temperature events.
• Existing methods for temperature field reconstruction in such scenarios yield unsatisfactory results.

Purpose of the Study:

• To design and validate a C-type two-thermocouple system for transient temperature measurement in high-temperature environments.
• To improve the accuracy and reliability of temperature field reconstruction for boron-containing warm-pressure explosives.

Main Methods:

• System characterization using blind system identification and a novel cost function optimized via gradient descent.
• Temperature reconstruction employing an auto-regressive with extra inputs model.
• Experimental validation using a high-temperature furnace to analyze thermocouple dynamic characteristics.

Main Results:

• The C-type two-thermocouple system demonstrated superior performance compared to single thermocouples.
• The temperature reconstruction achieved a root mean squared error of 0.0162 and a goodness of fit of 89.13%.
• Analysis revealed the impact of exposure length and wire diameter on thermocouple output.

Conclusions:

• The developed two-thermocouple method offers enhanced accuracy for transient temperature measurements in demanding environments.
• The findings validate the feasibility and effectiveness of the proposed system for high-temperature applications.