(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, PJUPNA06-2022
In 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.
