resumo
This paper presents the development of a multiparameter sensing system using a single fiber Bragg grating (FBG) with a polarization-assisted analysis. In this case, the FBG sensor is subjected to axial strain, torsion angle and temperature for the analysis of polarization components and spectral features variations. In addition, the responses at two orthogonal polarization states are compared to evaluate the feasibility of developing a polarization-based analysis for multifeature regression. Results show the differences in the sensors responses considering the full spectrum and the polarization components, where non uniform strain components lead to differences in the polarization states, which are used on the simultaneous analysis of different mechanical loadings combinations. Furthermore, the simultaneous estimation of axial strain, torsion angle and temperature resulted in small relative errors when the whole range of the tests are considered. The relative errors are below 0.5 % for each mechanical load condition, whereas a root mean squared error of 2.91 degrees C is obtained for the temperature analysis. Thus, the proposed approach resulted in a suitable alternative for three parameters sensing using only one FBG in standard single mode silica optical fiber without any structural modification, which can lead to a new approach on spectrally efficient sensor systems for practical applications.
palavras-chave
FBG ARRAYS; SENSOR; STRAIN
categoria
Engineering; Optics; Telecommunications
autores
Leal, A Jr; Silveira, M; Macedo, L; Frizera, A; Marques, C
nossos autores
Carlos Marques
Professor Auxiliaragradecimentos
This research is financed by Financiadora de Estudos e Projetos (2784/20) ; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (403753/2021-0, 440064/2022-8, 304049/2019-0, 310709/2021-0) ; Fundacao de Amparo a Pesquisa e Inovacao do Espirito Santo (1004/2022, 970/2020, 2022-C5K3H, 2021-TBG0J, 2022-D48XB, 2022-2JV95) . This work was developed within the Scope of the projects i3N (LA/P/0037/2020, UIDB/50025/2020 & UIDP/50025/2020) , CICECO-Aveiro Institute of Materials (UIDB/50011/2020 and UIDP/50011/2020) and DigiAqua (PTDC/EEI-EEE/0415/2021) financed by Portuguese funds through the FCT/MEC and when appropriate cofinanced by FEDER under the PT2020 Partnership Agreement.