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 250 km ultra long remote sensor system based on a fiber loop mirror interrogated by an OTDR(Optical Society of America, 2011) Bravo Acha, Mikel; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel; Frazão, Orlando; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta ElektronikoaA 253 km ultra long remote displacement sensor system based on a fiber loop mirror interrogated by a commercial OTDR is proposed and experimentally demonstrated. The use of a fiber loop mirror increases the signal to noise ratio allowing the system to interrogate sensors placed 253 km away from the monitoring system without using any optical amplification. The displacement sensor was based on a long period grating spliced inside of the loop mirror, which modifies the mirror reflectivity accordingly to the applied displacement.Publication Open Access Multiplexing optical fiber Fabry-Perot interferometers based on air-microcavities(SPIE, 2019) Pérez Herrera, Rosa Ana; Novais, Susana; Bravo Acha, Mikel; Leandro González, Daniel; Silva, Susana; Frazão, Orlando; López-Amo Sáinz, Manuel; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de ComunicaciónIn this work we demonstrate the multiplexing capability of new optical fiber Fabry-Perot interferometers based on airmicrocavities using a commercial FBG interrogator. Three optimized air-microcavity interferometer sensors have been multiplexed in a single network and have been monitored using the commercial FBGs interrogator in combination with FFT calculations. Results show a sensitivity of 2.18 π rad/mε and a crosstalk-free operation.Publication Open Access Micro-displacement sensor combined with a fiber ring interrogated by an optical time-domain reflectometer(IEEE, 2014) Bravo Acha, Mikel; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel; Frazão, Orlando; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta ElektronikoaA micro-displacement sensing head based on two aligned cleaved fibers inserted into an optical fiber ring and interrogated by an OTDR is presented. The sensor configuration is characterized for measuring both longitudinal and axial microdisplacement, showing a sensitivity of 0.07 dB/mm and 2.67 dB/mm for longitudinal and axial micro-displacement, respectively. A multiplexing system using two of these configurations is also studied.