• Enhancement of signal-to-noise ratio in Brillouin optical time domain analyzers by dual-probe detection 

      Iribas Pardo, Haritz; Loayssa Lara, Alayn; Sauser, Florian; Llera, Miguel; Le Floch, Sébastien (SPIE, 2017)   Congreso / Biltzarra
      We demonstrate a simple technique to enhance the signal-to-noise ratio (SNR) in Brillouin optical time-domain analysis sensors by the addition of gain and loss processes. The technique is based on the shift of the pump ...
    • Brillouin optical time-domain analyzer for extended sensing range using probe dithering and cyclic coding 

      Iribas Pardo, Haritz; Loayssa Lara, Alayn; Sauser, Florian; Llera, Miguel; Le Floch, Sébastien (SPIE, 2017)   Congreso / Biltzarra
      We present an enhanced performance Brillouin optical time-domain analysis sensor that uses dual probes waves with optical frequency modulation and cyclic coding. The frequency modulation serves to increase the probe power ...
    • Title enhancement of the sensitivity of a volatile organic compounds MOF-sensor by means of its structure 

      López Torres, Diego; López Aldaba, Aitor; Elosúa Aguado, César; Auguste, Jean L.; Jamier, Rapahel; Roy, Philippe; López-Amo Sáinz, Manuel; Arregui San Martín, Francisco Javier (MDPI, 2017)   Congreso / Biltzarra
      In this paper, we experimentally compare several core structures of Microstructured Optical Fibers (MOFs) for low-finesse Fabry-Pérot (FP) sensors. These sensors are designed for Volatile Organic Compounds (VOCs) measurements. ...
    • Etched and nanocoated SMS fiber sensor for detection of salinity concentration 

      Cardona Maya, Y.; Villar Fernández, Ignacio del; Socorro Leránoz, Abián Bentor; Corres Sanz, Jesús María; Arregui San Martín, Francisco Javier; Botero Cadavid, J. F. (MDPI, 2017)   Congreso / Biltzarra
      An optical fibre refractometer has been developed by etching and deposition of a thin film of indium tin oxide (ITO) on a single-mode-multimode-single-mode (SMS) fibre structure. The interference between modes in this ...
    • Detection of ethanol in human breath using optical fiber long period grating coated with metal-organic frameworks 

      Acha Morrás, Nerea de; Hromadka, Jiri; Tokay, Begum; Correia, Ricardo; Elosúa Aguado, César; Matías Maestro, Ignacio; Arregui San Martín, Francisco Javier; Morgan, Stephen P.; Korposh, Sergiy (MDPI, 2017)   Congreso / Biltzarra
      An optical fiber sensor for ethanol detection in exhaled breath has been developed. It has been fabricated by functionalizing a Long Period Grating with a metal-organic framework, ZIF-8. The sensor’s response was tested ...
    • Monitoring the etching process in LPFGs towards development of highly sensitive sensors 

      Villar Fernández, Ignacio del; Cruz, José Luis; Socorro Leránoz, Abián Bentor; Díaz Lucas, Silvia; Corres Sanz, Jesús María; Arregui San Martín, Francisco Javier; Matías Maestro, Ignacio (MDPI, 2017)   Congreso / Biltzarra
      In this work, the monitoring of the etching process up to a diameter of 30 µm of two LPFG structures has been compared, one of them had initially 125 µm, whereas the second one had 80 µm. By tracking the wavelength shift ...
    • Brillouin optical time-domain analysis sensor with amplification of pump pulses and tolerant to non-local effects 

      Mompó Roselló, Juan José; Urricelqui Polvorinos, Javier; Loayssa Lara, Alayn (SPIE, 2016)   Congreso / Biltzarra
      We demonstrate a simple technique to provide conventional Brillouin optical time-domain analysis sensor with compensation for pump pulse attenuation and tolerance to non-local effects. The technique is based on operating ...
    • Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors 

      Mariñelarena Ollacarizqueta, Jon; Urricelqui Polvorinos, Javier; Loayssa Lara, Alayn (SPIE, 2016)   Congreso / Biltzarra
      We report on the effects of large pump pulse powers on Brillouin optical time-domain analysis (BOTDA) sensors based on phase-modulated probe wave and coherent detection. It is found that the large Brillouin gain that comes ...
    • Implementation and analysis of a wireless sensor network-based pet location monitoring system for domestic scenarios 

      Aguirre Gallego, Erik; López Iturri, Peio; Azpilicueta Fernández de las Heras, Leyre; Astrain Escola, José Javier; Villadangos Alonso, Jesús; Santesteban, Daniel; Falcone Lanas, Francisco Javier (MDPI, 2016)   Congreso / Biltzarra
      The flexibility of new age wireless networks and the variety of sensors to measure a high number of variables, lead to new scenarios where anything can be monitored by small electronic devices, thereby implementing Wireless ...
    • Characterization of radio propagation channel in urban vehicle to infrastructure environments to support WSNs 

      Granda, Fausto; Azpilicueta Fernández de las Heras, Leyre; Vargas Rosales, César; López Iturri, Peio; Aguirre Gallego, Erik; Astrain Escola, José Javier; Villandangos Alonso, Jesús; Falcone Lanas, Francisco Javier (MDPI, 2016)   Congreso / Biltzarra
      Vehicular ad hoc Networks (VANETs) enable vehicles to communicate with each other as well as with roadside units (RSUs). Although there is a significant research effort in radio channel modelling focused in vehicle to ...
    • Analysis of bluetooth-based wireless sensor networks performance in hospital environments 

      López Iturri, Peio; Led Ramos, Santiago; Aguirre Gallego, Erik; Azpilicueta Fernández de las Heras, Leyre; Serrano Arriezu, Luis Javier; Falcone Lanas, Francisco Javier (MDPI, 2016)   Congreso / Biltzarra
      In this work, a method to analyze the performance of Bluetooth-based Wireless Sensor Networks (WSN) deployed within hospital environments is presented. Due to the complexity that this kind of scenarios exhibit in terms of ...
    • Mitigation of modulation instability in Brillouin distributed fiber sensors by using orthogonal polarization pulses 

      Urricelqui Polvorinos, Javier; Alem, Mehdi; Sagüés García, Mikel; Thévenaz, Luc; Loayssa Lara, Alayn; Soto, Marcelo A. (SPIE, 2015)   Congreso / Biltzarra
      A technique based on the use of orthogonally-polarized pulses is proposed to mitigate the detrimental impact of modulation instability on Brillouin distributed fiber sensors. While the theoretical underpinnings of the ...
    • Overcoming non-local effects and Brillouin threshold limitations in Brillouin distributed sensors 

      Urricelqui Polvorinos, Javier; Ruiz Lombera, Rubén; Sagüés García, Mikel; Mirapeix, Jesús; López Higuera, José Miguel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We demonstrate, for the first time to our knowledge, a Brillouin optical time domain analysis sensor that is able to operate with a probe power larger than the Brillouin threshold of the deployed sensing fiber and that ...
    • Enhanced tolerance to pulse extinction ratio in Brillouin optical time domain analysis sensors by dithering of the optical source 

      Iribas Pardo, Haritz; Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We demonstrate the relaxation of the stringent requirements placed on the pulse extinction ratio in long-range Brillouin optical time-domain analysis sensors (BOTDA) by modulating the wavelength of the laser source that ...
    • Egituren egoeraren monitorizaziorako zuntz optikoan oinarritutako sentsore sinplifikatua 

      Iribas Pardo, Haritz; Sagüés García, Mikel; Mariñelarena Ollacarizqueta, Jon; Loayssa Lara, Alayn (Udako Euskal Unibertsitatea, 2015)   Congreso / Biltzarra
      Brillouin hedatuko denbora eremu optikoaren analisian (BOTDA) oinarritutako sentsoreak, estruktura handien (100 km luzerako estrukturak) deformazioa eta tenperatura neurtzeko gaitasuna dute. Lan honetan, BOTDA konfigurazio ...
    • Simplified Brillouin sensor for structural health monitoring applications based on passive optical filtering 

      Iribas Pardo, Haritz; Urricelqui Polvorinos, Javier; Mariñelarena Ollacarizqueta, Jon; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We present a simplified configuration for distributed Brillouin optical time domain analysis sensors. The technique is based on passive optical filtering of the spectral components generated in an RF-pulse-modulated optical ...
    • Sources of noise in Brillouin optical time-domain analyzers 

      Urricelqui Polvorinos, Javier; Soto, Marcelo A.; Thévenaz, Luc (SPIE, 2015)   Congreso / Biltzarra
      This paper presents a thorough study of the different sources of noise affecting Brillouin optical time-domain analyzers (BOTDA), providing a deep insight into the understanding of the fundamental limitations of this kind ...
    • Brilloun optical time domain analysis sensor assisted by a Brillouin distributed amplifier 

      Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2015)   Congreso / Biltzarra
      We demonstrate the extension of the measurement range of Brillouin optical time-domain analysis (BOTDA) sensors using a distributed Brillouin amplifier (DBA). The technique is based on injecting a DBA pump wave in the ...
    • Technical specifications and quality control procedures for reducing the uncertainty in PV installations: results of the FP7 project PVCROPS 

      Martínez Moreno, Francisco; Lorenzo Pigueiras, Eduardo; Narvarte Fernández, Luis; Moretón Villagra, Rodrigo; Tyutyundzhiev, Nicolay; Parra Laita, Íñigo de la (EU PVSEC, 2015)   Congreso / Biltzarra
      PVCROPS (PhotoVoltaic Cost r€duction, Reliability, Operational performance, Prediction and Simulation) is a project within the European Framework Programme 7 whose objectives are: improving the performance, reliability ...
    • Blind spot mitigation in phased array antenna using metamaterials 

      Crépin, Thomas; Martel, Cédric; Gabard, Benjamin; Boust, Fabrice; Martinaud, Jean-Paul; Dousset, Thierry; Rodríguez Ulibarri, Pablo; Beruete Díaz, Miguel; Loecker, Claudius; Bertuch, Thomas; Marcotegui Iturmendi, José Antonio; Maci, Stefano (IEEE, 2014)   Congreso / Biltzarra
      In this work, a metaradome based on a fakir’s bed of nails is designed and tested in order to suppress the blind directions of a 100-element antenna array. The antenna is a microstrip array designed to operate in X-band. ...