Calibration and Uncertainty Evaluation of Fiber Bragg Grating Temperature Sensors

Alberto Vallan, Aurora Bellone, Guido Perrone, Marco Sento, Alessio Carullo

Abstract

The spectral response of Fiber Bragg Gratings (FBGs) is highly sensitive to temperature, making them ideal for sensors in industrial, structural, and medical applications. Although FBG thermometers are more expensive and require complex interrogation systems, their immunity to electromagnetic interference makes them the preferred option in challenging environments. In such cases, FBG sensors' unique benefits outweigh their typically lower accuracy. However, there are situations where high measurement accuracy is critical. This paper focuses on using FBG-based sensors for temperature measurements where accuracy is of primary concern. It outlines a calibration setup, analyzes uncertainty sources, and describes some contributions from both the thermal and optical components of the measurement system. Experimental results show that the performance of the interrogation system depends also on the FBG's characteristics and in some cases an independent calibration of the grating and system is not sufficient to assess the overall temperature uncertainty.

Download

IMEKO-TC2-2025-005.pdf

DOI

10.21014/tc2-2025.005

IMEKO TC

TC2 - Photonics

Back to the proceedings