Browsing by Author "Frazão, Orlando"

Now showing items 1-14 of 14

    • 250 km ultra long remote sensor system based on a fiber loop mirror interrogated by an OTDR 

      Bravo Acha, Mikel Upna Orcid; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel Upna Orcid; Frazão, Orlando (Optical Society of America, 2011)   Artículo / Artikulua  OpenAccess
      A 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 ...

    • Erbium-doped fiber ring cavity for the measurement of refractive index variations 

      Pérez Herrera, Rosa Ana Upna Orcid; Soares, Liliana; Novais, Susana; Frazão, Orlando; Silva, Susana (SPIE, 2023)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, an erbium-doped fiber ring cavity based on a 3dB optical coupler for refractive index measurements is presented and experimentally verified. This interrogation system, based on a 1 x 2 optical coupler, uses ...

    • Experimental and numerical characterization of a hybrid Fabry-Perot cavity for temperature sensing 

      López Aldaba, Aitor Upna; Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna Orcid; Frazão, Orlando; Santos, José Luís; Baptista, José Manuel; Baierl, Hardy; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe (MDPI, 2015)   Artículo / Artikulua  OpenAccess
      A hybrid Fabry-Pérot cavity sensing head based on a four-bridge microstructured fiber is characterized for temperature sensing. The characterization of this cavity is performed numerically and experimentally in the L-band. ...

    • Fiber cavity ring down and gain amplification effect 

      Silva, Susana; Magalhães, Regina; Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; Marques, M. B.; Frazão, Orlando (Springer Nature, 2016)   Artículo / Artikulua  OpenAccess
      The effect of an erbium-doped fiber amplifier (EDFA) placed inside the fiber ring of a cavity ring down (CRD) configuration is studied. The limitations and advantages of this configuration are discussed, and the study of ...

    • Frequency modulated continuous wave system for optical fiber intensity sensors with optical amplification 

      Pérez Herrera, Rosa Ana Upna Orcid; Frazão, Orlando; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luis Alberto; Baptista, José Manuel; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2009)   Artículo / Artikulua  OpenAccess
      We report on the use of erbium doped fiber (EDF) amplification to enhance a frequency modulated continuous wave (FMCW) technique for referencing optical intensity sensors located between two Bragg grating structures. The ...

    • Measurement of paracetamol concentration using a fiber laser system 

      Soares, Liliana; Pérez Herrera, Rosa Ana Upna Orcid; Novais, Susana; Ferreira, António; Frazão, Orlando; Silva, Susana (IEEE, 2023)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A linear fiber laser system for measurements of paracetamol concentration is experimentally demonstrated. The cavity is based on a fiber loop mirror and an FBG centered at 1567.8 nm. The sensing head corresponds to a ...

    • Measurement of paracetamol concentration using an erbium-doped fiber ring cavity 

      Soares, Liliana; Pérez Herrera, Rosa Ana Upna Orcid; Novais, Susana; Ferreira, António; Silva, Susana; Frazão, Orlando (MDPI, 2023)   Artículo / Artikulua  OpenAccess
      Process Analytical Technology (PAT) has been increasingly used in the pharmaceutical industry to monitor essential parameters in real-time during pharmaceutical processes. The concentration of Active Pharmaceutical Ingredients ...

    • Micro-displacement sensor based on a hollow-core photonic crystal fiber 

      Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna Orcid; Baptista, José Manuel; Santos, José Luís; Frazão, Orlando (MDPI, 2012)   Artículo / Artikulua  OpenAccess
      A sensing head based on a hollow-core photonic crystal fiber for in-reflection measurement of micro-displacements is presented. The sensing structure takes advantage of the multimodal behavior of a short segment ...

    • Micro-displacement sensor combined with a fiber ring interrogated by an optical time-domain reflectometer 

      Bravo Acha, Mikel Upna Orcid; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel Upna Orcid; Frazão, Orlando (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      A 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 ...

    • Multiplexing optical fiber Fabry-Perot interferometers based on air-microcavities 

      Pérez Herrera, Rosa Ana Upna Orcid; Novais, Susana; Bravo Acha, Mikel Upna Orcid; Leandro González, Daniel Upna Orcid; Silva, Susana; Frazão, Orlando; López-Amo Sáinz, Manuel Upna Orcid (SPIE, 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In 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 ...

    • Multiwavelength Raman fiber lasers using Hi-Bi photonic crystal fiber loop mirrors combined with random cavities 

      Rodrigues Pinto, Ana Margarida Upna; Frazão, Orlando; Santos, José Luís; López-Amo Sáinz, Manuel Upna Orcid (IEEE / OSA, 2011)   Artículo / Artikulua  OpenAccess
      Different multiwavelength Raman fiber lasers based on a hybrid cavity set-up are proposed. The lasing schemes are based in highly birefringent photonic crystal fiber loop mirrors combined with random cavities. The Hi-Bi ...

    • Paracetamol concentration-sensing scheme based on a linear cavity fiber laser configuration 

      Soares, Liliana; Pérez Herrera, Rosa Ana; Novais, Susana; Ferreira, António; Frazão, Orlando; Silva, Susana (Elsevier, 2023)   Artículo / Artikulua
      A paracetamol concentration-sensing scheme based on a linear cavity fiber laser configuration is demonstrated experimentally. The laser cavity has a fiber sensor at one end, that allows refractive index measurements. The ...

    • Ring cavity erbium-doped fiber for refractive index measurements 

      Pérez Herrera, Rosa Ana Upna Orcid; Soares, Liliana; Silva, Susana; Frazão, Orlando (MDPI, 2022)   Artículo / Artikulua  OpenAccess
      In this study, an interrogation system based on an erbium-doped fiber ring cavity for refractive index measurements is presented and experimentally demonstrated. This cavity ring includes a 1 × 3 coupler wherein one of the ...

    • Simultaneous measurement of strain and temperature based on clover microstructured fiber loop mirror 

      Pérez Herrera, Rosa Ana Upna Orcid; André, R. M.; Silva, S. F.; Becker, M.; Schuster, K.; Kobelke, J.; López-Amo Sáinz, Manuel Upna Orcid; Santos, José Luís; Frazão, Orlando (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
      In this work, two all-fiber loop mirrors using a clover microstructured fiber for the simultaneous measurement of temperature and strain are presented. The sensing heads are formed by a short piece of clover microstructured ...
      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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