Investigation of the Influence of Temperature on the Characteristics of Fibre Bragg Gratings
DOI:
https://doi.org/10.31861/sisiot2025.2.02010Keywords:
fibre Bragg grating (FBG), uniform FBG, tilted FBG, spectral characteristics, temperature sensitivityAbstract
The article presents the results of a fibre Bragg grating (FBG) investigation. Two types of FBGs, uniform and tilted, were fabricated. They were inscribed in the cores of fibres using a UV excimer laser KrF Coherent Bragg Star M and the phase mask method. Photosensitive optical fibres GF1 were chosen for FBG fabrication. The properties and characteristics of the fabricated FBGs were investigated in order to design fibre-optic bending sensors. In this case, the analysis of FBG spectral characteristics and temperature sensitivity dependencies is crucial. The setup including a climatic chamber, an AQ6370D Optical Spectrum Analyser, an S5FC1550S-A2 SM Benchtop SLD Source and a computer was used for FBG spectral characteristics and temperature sensitivity measurement. Spectral characteristics of uniform and tilted FBGs were investigated within the temperature range from -40.6°C to 181.8°C. The following peaks in the spectral characteristics in the above-mentioned temperature range were chosen for analysis: the Bragg peak for uniform FBGs and such peaks as Bragg peak, Ghost peak and three peaks of certain wavelengths for tilted FBGs. The shifts of the analysed peaks in the spectral characteristics with temperature were observed. Temperature dependencies of wavelengths of the analysed peaks were obtained. It was shown that there is an approximately linear temperature dependence of the Bragg wavelength and other above-mentioned analysed peaks of certain wavelengths. The linear character of the investigated temperature dependencies of the fabricated FBGs allows for their use in sensor application. It was shown that temperature sensitivities of uniform and tilted FBGs were dependent on the temperature range chosen. Temperature sensitivities approximately equal to 11.1 – 11.4 pm / °C in a temperature range of 120.8 – 181.8 °C and approximately equal to 8.5 – 8.9 pm / °C in a temperature range of -40.6 – 20.7 °C for uniform and tilted FBGs were determined. Temperature sensitivities were dependent on certain wavelength and changed from 8.4 pm / °C to 10.1 pm / °C for particular wavelengths.
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