Envíos recientes

  • Design of low-cost smart accelerometers 

    Carlosena García, Alfonso; López Martín, Antonio; Massarotto, Marco; Cruz Blas, Carlos Aristóteles de la; Lecumberri Villamediana, Pablo; Gómez Fernández, Marisol; Pintor Borobia, Jesús María; Gárriz Sanz, Sergio (Universitat Politècnica de Catalunya, 2005)   Artículo / Artikulua
    The goal of this project is to design a low-cost smart accelerometer, making use of a piezoelectric element as basic sensing material, and adding a mixed-mode conditioning circuit.
  • Computation of greatest common divisor for the blind deconvolution of transient impulsive signals 

    Lecumberri Villamediana, Pablo; Gómez Fernández, Marisol; Carlosena García, Alfonso (Universitat Politècnica de Catalunya, 2005)   Congreso / Biltzarra
    We propose a new blind deconvolution method for transient impulsive signals in a single input – multiple output (SIMO) system. The method exploits the data redundancy inherent to SIMO multichannel systems to obtain an ...
  • A novel PLL architecture 

    Osa, Juan I.; Carlosena García, Alfonso; López Martín, Antonio (2000)   Congreso / Biltzarra
    A novel phase-locked loop scheme is proposed in this paper, whose main distinguishing features are infinite hold-in range, pull-out range fractionally constant and also a ripple fractionally constant. To this end, it ...
  • Multichannel blind deconvolution of impulsive signals 

    Lecumberri Villamediana, Pablo; Gómez Fernández, Marisol; Carlosena García, Alfonso (2005)   Congreso / Biltzarra
    In this communication, the problem of blind deconvolution of transient, impulsive signals in a multichannel environment is addressed. This kind of signals arise naturally, or are used as external excitation, in many ...
  • Analysis and synthesis of vibrato in lyric singers 

    Arroabarren Alemán, Ixone; Carlosena García, Alfonso (2002)   Congreso / Biltzarra
    In this paper two aspects of the vibrato signal characterisation are presented. First, an analysis method, which breaks down the musical signal into its different partials, and decomposes them into two separate ...
  • Unified analysis of glottal source spectrum 

    Arroabarren Alemán, Ixone; Zivanovic, Miroslav; Carlosena García, Alfonso (ISCA, 2003)   Congreso / Biltzarra
    The spectral study of the glottal excitation has traditionally been based on a single time-domain mathematical model of the signal, and the spectral dependence on its time domain parameters. Opposite to this approach, ...
  • Two methods for nonparametric spectrum peak discrimination 

    Zivanovic, Miroslav; Carlosena García, Alfonso (2002)   Congreso / Biltzarra
    The conventional DFT-oriented nonparametric interpolation methods, based on time windowing and the DTFT envelope curve resampling (zero padding, Chirp-z [1], frequency scale distortion [2], etc.), can improve the spectrum ...
  • Glottal spectrum based inverse filtering 

    Arroabarren Alemán, Ixone; Carlosena García, Alfonso (ISCA, 2003)   Congreso / Biltzarra
    In this paper a new inverse filtering technique for the time-domain estimation of the glottal excitation is presented. This approach uses the DAP modeling for the vocal tract characterization, and a spectral model for the ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Brillouin distributed sensing assisted by Brillouin amplification of pump pulses 

    Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (IEEE, 2014)   Congreso / Biltzarra
    We demonstrate, for the first time to our knowledge, the extension of the measurement range of Brillouin distributed sensors (BDS) by using a distributed Brillouin amplifier (DBA) to compensate the attenuation of the ...
  • Synthesis of virtual Brillouin frequency shift profiles in BOTDA sensors using optical source dithering 

    Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2014)   Congreso / Biltzarra
    We demonstrate a novel concept for Brillouin optical time domain analysis sensors that is based on synthesizing a virtual Brillouin frequency shift profile along the sensing fiber. The technique is based on modulating the ...
  • Phasorial DPP-BOTDA sensor tolerant to non-local effects 

    Urricelqui Polvorinos, Javier; Mariñelarena Ollacarizqueta, Jon; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2014)   Congreso / Biltzarra
    We introduce a modification of the differential pulse width pair technique in a BOTDA sensor based on a phase modulated probe wave and RF demodulation. This provides a differential Brillouin phasorial signal with high ...
  • Polarization diversity for Brillouin distributed fiber sensors based on a double orthogonal pump 

    Urricelqui Polvorinos, Javier; López Fernandino, Felipe; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2014)   Congreso / Biltzarra
    We demonstrate a novel Brillouin optical time domain analysis sensor deploying a polarization diversity technique which eliminates the need for polarization scrambling, providing measurements that are largely immune to the ...
  • Phase-shift based BOTDA measurements tolerant to non-local effects 

    Urricelqui Polvorinos, Javier; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2013)   Congreso / Biltzarra
    We demonstrate a BOTDA sensor based on the use of the Brillouin phase shift that performs measurements tolerant to non local effects. This technique raises opportunities to increase the distance covered by these sensors ...
  • Dynamic BOTDA measurements using Brillouin phase-shift 

    Urricelqui Polvorinos, Javier; Zornoza Indart, Ander; Sagüés García, Mikel; Loayssa Lara, Alayn (SPIE, 2012)   Congreso / Biltzarra
    We demonstrate a novel dynamic BOTDA sensor based, for the first time to our knowledge, on the use of the Brillouin phase-shift instead of the conventional Brillouin gain. This provides the advantage of measurements that ...
  • 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 ...
  • 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 ...

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