(Naval) Artículos
URI permanente para esta colecciónhttps://digital.inta.es/handle/20.500.12666/74
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Examinando (Naval) Artículos por Autor "González del Val, Miguel"
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Publicación Acceso Abierto Fiber bragg gratings sensor strain–optic behavior with different polymeric coatings subjected to transverse strain(Multidisciplinary Digital Publishing Institute (MDPI), 2024-04-27) González Gallego, Manuel; Terroba, Félix; Martínez Vicente, Juan Luis; González del Val, Miguel ; López Cela, Juan José; Frövel, Malte; Instituto Nacional de Técnica Aeroespacial (INTA); Ministerio de Ciencia e Innovación (MICINN)This research work is based on a previous study by the authors that characterized the behavior of FBG sensors with a polyimide coating in a structural monitoring system. Sensors applied to structural health monitoring are affected by the presence of simultaneous multidirectional strains. The previous study observed the influence of the transverse strain (ey) while keeping the longitudinal strain constant (ex), where the x direction is the direction of the optical fiber. The present study develops an experimental methodology consisting of a biaxial test plan on cruciform specimens with three embedded FBG sensors coated with polyimide, acrylate, and ORMOCER®. Applying the Strain–Optic Theory as a reference, a comparison of the experimental values obtained with the different coatings was studied. This experimental work made it possible to study the influence of the transverse strain (ey) on the longitudinal measurements of each FBGS and the influence of the coating material. Finally, the calibration procedure was defined as well as K (strain sensitivity factor) for each sensor.Publicación Acceso Abierto Thermal expansion calculation using FBGS in cryogenic applications(Elsevier, 2024-09-15) González del Val, Miguel ; Martínez Olmo, José Manuel; Terroba, Félix; Cabrerizo, F.; Turon, Albert; Renart, J.; Frövel, Malte; Ministerio de Ciencia e Innovación (MICINN); Agencia Estatal de Investigación (AEI)This study presents the measurement of the thermal expansion of aluminum alloy 6061 at cryogenic temperatures using Helium as the cooling medium. Three distinct tests were conducted to evaluate thermal expansion: two with gradual and natural heating of the material, and a third with temperature stabilization at key points. Measurements were carried out using Fiber Bragg Grating Sensors (FBGS), which provided precise and reliable data on the material's thermal behavior. The obtained results were compared with reference curves from the National Institute of Standards and Technology (NIST), showing good agreement and validation of the employed methods. This research highlights the effectiveness of using FBGS in measuring thermal expansion under cryogenic conditions and the importance of heating procedures in obtaining accurate data.
