Analýza vlivu okolní teploty na přesnost měření deformace ocelových konstrukcích pomocí FBG senzorů

Abstract

This bachelor’s thesis examines the effect of ambient temperature on the accuracy of measuring mechanical deformation in steel structures using fiber Bragg grating (FBG) sensors. The theoretical part of the thesis describes the principle of FBG sensors, the issue of cross-sensitivity to temperature and mechanical stress, and summarizes current methods of sensor encapsulation for industrial use. As part of the practical section, an experimental system was designed and implemented, comprising a linear motor and sensors in various encapsulation types, including an innovative method of embedding the grating into a 3D-printed housing. Measurements were conducted in a temperature chamber ranging from 10 °C to 40 °C, and the acquired data were compared with a reference strain gauge. The results revealed that the thermal expansion of the encapsulation material (PLA) significantly affects measurement accuracy.