Abstract—In the present paper is made a state-of-the-art of Fiber Brag Grating sensors in R&D domain. Moreover, a test protocol and experimental measurements using optical fibers are developed. First of all, free FBG (not bonded on the substrate) were studied to determine the sensitivity to temperature variations. It has been found that the Bragg wavelength has a linear variation with temperature. This variation is due both to the strain generated as a result of the expansion of the optical fiber component (glass) and to the change in the refractive index of the glass with the temperature. Next, the measurements were done with sensors bonded to the aluminium substrate and subjected to different scenarios of temperature and/or mechanical deformations. The results show the variation of the Bragg wavelength of the optical fiber with respect to the applied load and the temperature of the substrate to which it was bonded. These experimental researches have been made as a first step for Structural Health Monitoring applications in the field of (aero)space structures.
Index Terms—Structural health monitoring, fiber bragg grating, space and aerospace applications, optical fibers.
The authors are with National Institute for Aerospace Research “Elie Carafoli” – INCAS, Bucharest, Romania (e-mail: tudose.mihai@incas.ro, enciu.daniela@incas.ro, ursu.ioan@incas.ro)
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Cite: Mihai Tudose, Daniela Enciu, and Ioan Ursu, "Towards Use of Fiber Bragg Grating Sensors for Structural Health Monitoring of (aero)Space Structures," International Journal of Modeling and Optimization vol. 8, no. 4, pp. 246-249, 2018.
