Measurement error of surface-mounted fiber Bragg grating temperature sensor

Area of Science:

• Physics
• Materials Science
• Engineering

Background:

• Fiber Bragg grating (FBG) sensors are widely applied for surface temperature measurements.
• The impact of temperature gradients on surface-mounted FBG sensors is frequently disregarded.
• Accurate surface temperature monitoring is crucial in various industrial and scientific applications.

Purpose of the Study:

• To investigate the measurement errors of FBG temperature sensors under surface-mounted conditions.
• To analyze the influence of packaging and fixation on FBG sensor accuracy.
• To compare the performance of FBG sensors with commercial thermal resistors.

Main Methods:

• A specialized surface-type temperature standard setup was designed and utilized.
• Experimental measurements were conducted using bare FBG sensors, packaged FBG sensors, and commercial thermal resistors.
• The relationship between measurement error and surface temperature was analyzed for different sensor configurations.

Main Results:

• Bare FBG sensors exhibited a clear linear relationship between measurement error and surface temperature, peaking at 8.1°C.
• FBG sensors packaged with heat conduction grease demonstrated reduced measurement errors.
• Packaged FBG sensors outperformed both bare FBG sensors and commercial thermal resistors in accuracy.

Conclusions:

• High-quality packaging and appropriate fixation methods are essential for enhancing the accuracy of FBG sensors for surface temperature measurement.
• The temperature gradient effect significantly impacts the performance of surface-mounted FBG sensors.
• Optimized FBG sensor configurations offer a viable alternative for precise surface temperature monitoring.