Bravo Acha, Mikel
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Bravo Acha
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Mikel
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Ingeniería Eléctrica, Electrónica y de Comunicación
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Publication Open Access Multicore fiber sensors for strain measurement towards traffic monitoring(SPIE, 2023) Sánchez González, Arturo; Pradas Martínez, Javier; Corera Orzanco, Íñigo; Bravo Acha, Mikel; Leandro González, Daniel; Dauliat, Romain; Jamier, Raphael; Roy, Philippe; Pérez Herrera, Rosa Ana; López-Amo Sáinz, Manuel; Ingeniería Eléctrica, Electrónica y de Comunicación; Institute of Smart Cities - ISC; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, PJUPNA06-2022In this work, two new interferometric sensors based on multicore optical fibers for the measurement of strain with the ultimate goal of traffic monitoring are presented. The operating principle of each sensor relied on the monitoring of the phase shift difference accumulated between the supermodes of the structure of the multicore segment in a full round trip. The strain characterization for both sensors resulted in a linear response, with sensitivities of -4.073·10-3 rad/με and - 4.389·10-3 rad/με for the aligned and V-shaped cases respectively, and one-hour instabilities below 4.6·10-3 rad with a 95% confidence level. These results suggest its feasibility in applications requiring high sensitivities over very wide strain ranges, such as heavy-vehicle traffic monitoring. To corroborate the hypothesis, both sensors were integrated into the pavement and their response to the traffic was analyzed.Publication Open Access Optical fiber pH sensors based on PAni-coated microstructured optical fibers(IEEE, 2024-07-10) Rodríguez Rodríguez, Armando; Lopes, Guilherme; Nedoma, Jan; Pereira, Sónia O.; Fernandes, Antonio J. S.; Jamier, Raphael; Roy, Philippe; Bravo Acha, Mikel; López-Amo Sáinz, Manuel; Marques, Carlos; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza; Institute of Smart Cities - ISC; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaIn this article, we report the analysis of a novel optical fiber pH sensor based in polyaniline (PAni) coating applied on a trenched core-free (only-bridge) silica fiber. The results are compared to another pH sensor based on side-polished silica fiber. The pH-sensitive polymer is synthesized over the fiber sample by means of oxidative polymerization, keeping records of the time where the reaction occurs to improve the sensitivity. The response to pH is enhanced in the case of the trenched core-free bridge fiber due to the higher interaction of the evanescent field with the PAni film and, thus, the surrounding media. The sensitivity in the linear zone of operation is 1.1 mW/pH, and a total transmittance of 55% in the pH range is 4.2-8.1. The repeatability of both sensors was checked, showing a high capability to perform studies in liquid samples due to its temperature independence, good sensitivity, and long-term stability.