Research Topics

O Frazão

Summary

Affiliation: Faculdade de Engenharia
Country: Portugal

Publications

  1. ncbi request reprint Simultaneous measurement of multiparameters using a Sagnac interferometer with polarization maintaining side-hole fiber
    O Frazão
    INESC Porto, Rua do Campo Alegre 687, 4169 007, Porto, Portugal
    Appl Opt 47:4841-8. 2008
  2. ncbi request reprint Optical inclinometer based on a single long-period fiber grating combined with a fused taper
    O Frazão
    INESC Porto, Rua do Campo Alegre, Porto, Portugal
    Opt Lett 31:2960-2. 2006
  3. ncbi request reprint Optical flowmeter using a modal interferometer based on a single nonadiabatic fiber taper
    O Frazão
    INESC Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Opt Lett 32:1974-6. 2007
  4. ncbi request reprint All-fiber Mach-Zehnder curvature sensor based on multimode interference combined with a long-period grating
    O Frazão
    INESC Porto, Rua do Campo Alegre 687, Portugal
    Opt Lett 32:3074-6. 2007
  5. ncbi request reprint Strain sensitivity control of fiber Bragg grating structures with fused tapers
    Orlando Frazão
    Instituto de Engenharia de Sistemas e Computadores do Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Appl Opt 46:8578-82. 2007
  6. ncbi request reprint Curvature sensor using a highly birefringent photonic crystal fiber with two asymmetric hole regions in a Sagnac interferometer
    Orlando Frazão
    INESC Porto Instituto de Engenharia de Sistemas e Computadores do Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Appl Opt 47:2520-3. 2008
  7. doi request reprint Temperature- and strain-independent torsion sensor using a fiber loop mirror based on suspended twin-core fiber
    Orlando Frazão
    INESC Porto Instituto de Engenharia de Sistemas e Computadores do Porto, Rua do Campo Alegre 687, 4169 007, Porto, Portugal
    Opt Lett 35:2777-9. 2010
  8. ncbi request reprint Optical refractometer based on a birefringent Bragg grating written in an H-shaped fiber
    O Frazão
    INESC Porto, Porto, Portugal
    Opt Lett 34:76-8. 2009
  9. ncbi request reprint Fabry-Perot refractometer based on an end-of-fiber polymer tip
    O Frazão
    INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
    Opt Lett 34:2474-6. 2009
  10. doi request reprint Modal interferometer based on hollow-core photonic crystal fiber for strain and temperature measurement
    S H Aref
    INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
    Opt Express 17:18669-75. 2009

Collaborators

  • R M Silva
  • G Statkiewicz-Barabach
  • Susana Silva
  • Raquel B Queirós
  • M S Ferreira
  • J L Santos
  • S H Aref
  • L A Ferreira
  • F M Araujo
  • R Romero
  • R M André
  • L Coelho
  • J M Baptista
  • P V S Marques
  • Kay Schuster
  • S O Silva
  • P Jorge
  • F Xavier Malcata
  • M G F Sales
  • G Aguilar
  • S Fevrier
  • J P Noronha
  • R Jamier
  • P Roy
  • Jens Kobelke
  • R Amezcua-Correa
  • P Caldas
  • J C Knight
  • J P Carvalho
  • F Farahi
  • H Latifi
  • H M Salgado
  • D A Pereira

Detail Information

Publications16

  1. ncbi request reprint Simultaneous measurement of multiparameters using a Sagnac interferometer with polarization maintaining side-hole fiber
    O Frazão
    INESC Porto, Rua do Campo Alegre 687, 4169 007, Porto, Portugal
    Appl Opt 47:4841-8. 2008
    ..A matrix equation for simultaneous measurement of the three parameters--torsion, temperature, and longitudinal strain--is also proposed...
  2. ncbi request reprint Optical inclinometer based on a single long-period fiber grating combined with a fused taper
    O Frazão
    INESC Porto, Rua do Campo Alegre, Porto, Portugal
    Opt Lett 31:2960-2. 2006
    ....
  3. ncbi request reprint Optical flowmeter using a modal interferometer based on a single nonadiabatic fiber taper
    O Frazão
    INESC Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Opt Lett 32:1974-6. 2007
    ..It is observed that the returned light from this fiber structure shows a channeled spectrum similar to that of a two-wave Michelson interferometer. The application of this device as a fiber optic flowmeter sensor is demonstrated...
  4. ncbi request reprint All-fiber Mach-Zehnder curvature sensor based on multimode interference combined with a long-period grating
    O Frazão
    INESC Porto, Rua do Campo Alegre 687, Portugal
    Opt Lett 32:3074-6. 2007
    ..A LPG placed after the MMF couples light back into the fiber core, completing the Mach-Zehnder interferometer. This novel configuration was demonstrated as a bending sensor...
  5. ncbi request reprint Strain sensitivity control of fiber Bragg grating structures with fused tapers
    Orlando Frazão
    Instituto de Engenharia de Sistemas e Computadores do Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Appl Opt 46:8578-82. 2007
    ..The strain sensing characteristics of an interferometric structure formed by fabricating a fused taper in the middle of a fiber Bragg grating are also reported...
  6. ncbi request reprint Curvature sensor using a highly birefringent photonic crystal fiber with two asymmetric hole regions in a Sagnac interferometer
    Orlando Frazão
    INESC Porto Instituto de Engenharia de Sistemas e Computadores do Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Appl Opt 47:2520-3. 2008
    ..6-5 m(-1). Temperature and longitudinal strain was also characterized for constant curvature. The configuration showed insensitivity to these two physical parameters...
  7. doi request reprint Temperature- and strain-independent torsion sensor using a fiber loop mirror based on suspended twin-core fiber
    Orlando Frazão
    INESC Porto Instituto de Engenharia de Sistemas e Computadores do Porto, Rua do Campo Alegre 687, 4169 007, Porto, Portugal
    Opt Lett 35:2777-9. 2010
    ..Using the fast Fourier transform technique, it is possible to obtain measurand-induced amplitude variations of the fringe pattern. The results obtained indicate the viability of a temperature- and strain-independent torsion sensor...
  8. ncbi request reprint Optical refractometer based on a birefringent Bragg grating written in an H-shaped fiber
    O Frazão
    INESC Porto, Porto, Portugal
    Opt Lett 34:76-8. 2009
    ..When the Hi-Bi FBG is immersed in different liquids, different responses of the slow and fast wavelengths are obtained. The refractometer is also capable of simultaneous measurement of refractive index and temperature...
  9. ncbi request reprint Fabry-Perot refractometer based on an end-of-fiber polymer tip
    O Frazão
    INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
    Opt Lett 34:2474-6. 2009
    ..The Fabry-Perot interferometer is coherence addressed and heterodyne interrogated, resulting into a liquid refractive index resolution of approximately 7.5x10(-4)...
  10. doi request reprint Modal interferometer based on hollow-core photonic crystal fiber for strain and temperature measurement
    S H Aref
    INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
    Opt Express 17:18669-75. 2009
    ..Resolutions of +/- 1.4 microepsilon and +/- 0.2 degrees C were achieved for strain and temperature, respectively. It was also found that the fiber structure is not sensitive to curvature...
  11. doi request reprint Optical refractometer based on large-core air-clad photonic crystal fibers
    Susana Silva
    Instituto de Engenharia de Sistemas e Computadores INESC Porto, Porto, Portugal
    Opt Lett 36:852-4. 2011
    ..The results indicated the high sensitivity of this sensing head to refractive index variations of water, and a resolution of 3.4×10(-5) refractive index units could be achieved...
  12. doi request reprint Microcystin-LR detection in water by the Fabry-Pérot interferometer using an optical fibre coated with a sol-gel imprinted sensing membrane
    Raquel B Queirós
    INESC Porto, UOSE, Rua do Campo Alegre, Portugal Departamento de Física, Faculdade de Ciencias, Universidade do Porto, Portugal BIOMARK ISEP, Instituto Superior de Engenharia do Porto, Porto, Portugal
    Biosens Bioelectron 26:3932-7. 2011
    ..It was successfully applied to the determination of MCT in contaminated samples. The main advantages of the proposed optical sensor include high sensitivity and specificity, low-cost, robustness, easy preparation and preservation...
  13. ncbi request reprint Intensity-referenced and temperature-independent curvature-sensing concept based on chirped fiber Bragg gratings
    R Romero
    AUnidade de Optoelectrónìca e Systemas Electrónicos of INESC Porto, Rua do Campo Alegre 687, 4169 007 Porto, Portugal
    Appl Opt 44:3821-6. 2005
    ..3 nm and lambda 02 = 1563.7 nm, we obtained a resolution of 1.6 mm/square root of Hz for the measurement of the radius of curvature (approximately R = 350 mm) over the measurement range 190 mm < R < infinity...
  14. doi request reprint Highly birefringent photonic bandgap Bragg fiber loop mirror for simultaneous measurement of strain and temperature
    M S Ferreira
    1INESC Porto, Porto, Portugal
    Opt Lett 36:993-5. 2011
    ..75 nm/°C, due to the group birefringence variation. The rms deviations obtained are ±19.32 με and ±0.5 °C, for strain and temperature measurements, respectively...
  15. doi request reprint Simultaneous measurement of curvature and strain using a suspended multicore fiber
    R M Silva
    INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal
    Opt Lett 36:3939-41. 2011
    ..The rms deviations are ±19 m(-1) and ±12.90 με for curvature and strain measurements, respectively...
  16. doi request reprint Gas refractometry based on an all-fiber spatial optical filter
    Susana Silva
    INESC Porto, Porto, Portugal
    Opt Lett 37:3450-2. 2012
    ..A maximum sensitivity of -1390 nm/RIU for the bandpass filter was achieved. Both devices have shown similar temperature responses with an average sensitivity of 25.7 pm/°C...