Dr. Paulo Caldas Profile

Dr. Paulo Caldas

at INESC Porto

SPIE Involvement:

Author

Publications (25)

Proceedings Article | 28 September 2015 Paper

Arc-induced gratings in the turning points

C. Colaço, P. Caldas, R. Chibante, G. Rego

Proceedings Volume 9634, 96346K (2015) https://doi.org/10.1117/12.2194274

KEYWORDS: Refractive index, Power supplies, Sensors, Electrodes, Cladding, Picosecond phenomena, Water, Structured optical fibers, Signal attenuation, Cryogenics

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Proceedings Article | 2 June 2014 Paper

Optical fiber refractive index sensor with reduced thermal sensitivity based on Superimposed Long-Period Gratings

G. Silva, P. Caldas, J. Santos

Proceedings Volume 9157, 91571S (2014) https://doi.org/10.1117/12.2059661

KEYWORDS: Sensors, Refractive index, Optical fibers, Cladding, Temperature metrology, Fiber optics sensors, Standards development, Fiber Bragg gratings, Temperature sensors, Modulation

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Proceedings Article | 2 June 2014 Paper

All-fiber sensor based on a metallic coated hybrid LPG-FBG structure for thermal characterization of materials

G. Silva, P. Caldas, J. Santos

Proceedings Volume 9157, 91571R (2014) https://doi.org/10.1117/12.2059655

KEYWORDS: Fiber Bragg gratings, Thin films, Temperature metrology, Sensors, Cladding, Titanium, Metals, Thermography, Optical fibers, Chromium

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Proceedings Article | 2 June 2014 Paper

Reflection-based phase-shifted long-period fiber grating for cryogenic temperature measurements

R. Martins, J. Monteiro, P. Caldas, J. Santos, G. Rego

Proceedings Volume 9157, 91571K (2014) https://doi.org/10.1117/12.2059529

KEYWORDS: Fiber Bragg gratings, Cryogenics, Sensors, Temperature metrology, Signal attenuation, Cladding, Head, Structured optical fibers, Glasses, Polishing

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Proceedings Article | 26 July 2011 Paper

Comparative study of different parameters of fibre Bragg gratings and long period gratings sensors for high-temperature measurements

Luis Melo, Nara Ângelo, Nelia Aberto, Carlos Marques, José Monteiro, Gaspar Rego, Paulo Caldas, Rogério Nogueira

Proceedings Volume 8001, 800123 (2011) https://doi.org/10.1117/12.892166

KEYWORDS: Fiber Bragg gratings, Ultraviolet radiation, Sensors, Temperature metrology, Hydrogen, Optical fibers, Resistance, Refractive index, Cladding, Phase shift keying

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Proceedings Article | 9 September 2010 Paper

Fibre optic hot-wire flowmeter based on a metallic coated hybrid LPG-FBG structure

P. Caldas, P. A. S. Jorge, G. Rego, O. Frazão, J. L. Santos, L. A. Ferreira, F. Araújo

Proceedings Volume 7653, 76530B (2010) https://doi.org/10.1117/12.866463

KEYWORDS: Fiber Bragg gratings, Cladding, Semiconductor lasers, Sensors, Silver, Head, Absorption, Fiber optics, Optical fibers, Thin films

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Proceedings Article | 9 September 2010 Paper

Investigation of long term stability of arc-induced gratings heat treated at high temperatures

Gaspar Rego, Paulo Caldas, Oleg Ivanov, José Luís Santos

Proceedings Volume 7653, 76530G (2010) https://doi.org/10.1117/12.866359

KEYWORDS: Heat treatments, Cladding, Refractive index, Crystals, Diffusion, Annealing, Glasses, Fiber optics sensors, Temperature sensors, Silica

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Proceedings Article | 9 September 2010 Paper

Interrogation of microresonators using multimode fibers

P. Caldas, P. A. S. Jorge, F. Araújo, L. Ferreira, G. Rego, J. Santos, S. Berneschi, F. Cosi, S. Soria, S. Pelli, G. Nunzi Conti

Proceedings Volume 7653, 76532P (2010) https://doi.org/10.1117/12.866355

KEYWORDS: Multimode fibers, Scattering, Microresonators, Silica, Resonators, Light scattering, Optical fibers, Optical spheres, Sensing systems, Signal detection

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Proceedings Article | 9 September 2010 Paper

Characterization of nanolayer LPG refractometer according surrounding refractive index

E. Simões, I. Abe, J. Oliveira, J. L. Pinto, P. Caldas, O. Frazão

Proceedings Volume 7653, 76531S (2010) https://doi.org/10.1117/12.866276

KEYWORDS: Refractive index, Cladding, Optical fibers, Sensors, Organic materials, Fiber coatings, Signal attenuation, Head, Fiber optics sensors, Phase matching

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Proceedings Article | 17 February 2010 Paper

20-mW 70-nm bandwidth ASE fibre optic source at 1060-nm wavelength region for optical coherence tomography

Irina Trifanov, Paulo Caldas, Liviu Neagu, Rosa Romero, Martin Berendt, José Salcedo, Adrian Podoleanu, António Lobo Ribeiro

Proceedings Volume 7580, 75800O (2010) https://doi.org/10.1117/12.844905

KEYWORDS: Optical coherence tomography, Imaging systems, Optical filters, Superluminescent sources, Fiber optics, Image resolution, In vivo imaging, Coherence imaging, Ophthalmology, Neodymium

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Proceedings Article | 5 October 2009 Paper

Effect of fiber tapering in LPG-based Mach-Zehnder modal interferometers for refractive-index sensing

P. Caldas, P. A. Jorge, F. Araújo, L. Ferreira, G. Rego, J. Santos

Proceedings Volume 7503, 750349 (2009) https://doi.org/10.1117/12.834951

KEYWORDS: Refractive index, Interferometers, Mach-Zehnder interferometers, Cladding, Sensors, Optical fibers, Biosensing, Structured optical fibers, Structural sensing, Remote sensing

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Proceedings Article | 5 October 2009 Paper

Strain and temperature characterization of interferometric sensors based on ARROW fibers

S. Aref, O. Frazão, P. Caldas, L. Ferreira, F. Araújo, J. Santos, H. Latifi, J. Ballato, T. Her, F. Farahi

Proceedings Volume 7503, 75032Y (2009) https://doi.org/10.1117/12.834580

KEYWORDS: Optical fibers, Interferometry, Sensors, Head, Temperature metrology, Interferometers, Waveguides, Refractive index, Glasses, Cladding

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Proceedings Article | 5 October 2009 Paper

Sensing characteristics of hollow-core photonic crystal fibre modal interferometers

S. Aref, R. Amezcua-Correa, J. Carvalho, O. Frazão, P. Caldas, J. Santos, F. Araújo, H. Latifi, F. Farahi, L. Ferreira, J. Knight

Proceedings Volume 7503, 750339 (2009) https://doi.org/10.1117/12.834485

KEYWORDS: Interferometers, Photonic crystal fibers, Interferometry, Sensors, Head, Structured optical fibers, Fusion splicing, Structural sensing, Fermium, Frequency modulation

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Proceedings Article | 16 May 2008 Paper

Modal LPG-based Mach-Zehnder interferometer with controlled sensitivity for refractive index measurement

P. Caldas, P. A. Jorge, F. Araújo, L. Ferreira, G. Rego, J. Santos

Proceedings Volume 7004, 700448 (2008) https://doi.org/10.1117/12.786093

KEYWORDS: Refractive index, Interferometers, Cladding, Mach-Zehnder interferometers, Phase shifts, Optical fibers, Interferometry, Sensors, Structural sensing, Waveguides

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Proceedings Article | 16 May 2008 Paper

Fibre refractometer based on a Fabry-Pérot interferometer

S. F. Silva, O. Frazão, P. Caldas, J. Santos, F. Araújo, L. Ferreira

Proceedings Volume 7004, 700446 (2008) https://doi.org/10.1117/12.786080

KEYWORDS: Refractive index, Liquids, Visibility, Interferometers, Fiber Bragg gratings, Water, Head, Interferometry, Fabry–Perot interferometry, Sensors

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SPIE Journal Paper | 1 May 2008

Optical fiber refractometer based on a Fabry-Pérot interferometer

Susana Silva, Orlando Frazão, Paulo Caldas, José Santos, F. M. Araujo, Luís Ferreira

OE, Vol. 47, Issue 05, 054403, (May 2008) https://doi.org/10.1117/12.10.1117/1.2931527

KEYWORDS: Refractive index, Interferometers, Liquids, Visibility, Fiber Bragg gratings, Optical fibers, Heterodyning, Interferometry, Water, Sensors

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SPIE Journal Paper | 1 April 2008

Fiber modal Michelson interferometers with coherence addressing and heterodyne interrogation

Paulo Caldas, Pedro Jorge, F. M. Araujo, Luís Ferreira, M. Marques, Gaspar Rego, José Santos

OE, Vol. 47, Issue 04, 044401, (April 2008) https://doi.org/10.1117/12.10.1117/1.2903089

KEYWORDS: Refractive index, Cladding, Interferometers, Michelson interferometers, Interferometry, Liquids, Sensing systems, Heterodyning, Single mode fibers, Head

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Proceedings Article | 2 July 2007 Paper

In-fibre Mach-Zehnder configuration based on fibre multimode interference structure combined with a long period grating

O. Frazão, J. Viegas, P. Caldas, F. Araújo, L. Ferreira, J. Santos, F. Farahi

Proceedings Volume 6619, 66192H (2007) https://doi.org/10.1117/12.738610

KEYWORDS: Structured optical fibers, Cladding, Interferometers, Multimode fibers, Mach-Zehnder interferometers, Sensors, Single mode fibers, Geometrical optics, Interferometry, Refractive index

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Proceedings Article | 2 July 2007 Paper

Study of LPG-assisted fibre modal Michelson interferometers with coherence addressing and heterodyne interrogation

P. Caldas, F. Araújo, L. Ferreira, G. Rego, M. Marques, J. Santos

Proceedings Volume 6619, 66192F (2007) https://doi.org/10.1117/12.738577

KEYWORDS: Cladding, Refractive index, Interferometers, Liquids, Silica, Phase shifts, Heterodyning, Sensing systems, Head, Michelson interferometers

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Proceedings Article | 2 July 2007 Paper

Origin of coupling to antisymmetric cladding modes in arc-induced long-period fiber gratings

O. Ivanov, P. Caldas, G. Rego

Proceedings Volume 6619, 66190X (2007) https://doi.org/10.1117/12.738367

KEYWORDS: Cladding, Electrodes, Temperature metrology, Silica, Modulation, Photography, Capillaries, Refractive index, Fiber couplers, Optical fibers

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Proceedings Article | 2 July 2007 Paper

Modal interferometer based on a single non-adiabatic fibre taper

O. Frazão, P. Caldas, J. Santos, F. Araújo, L. Ferreira

Proceedings Volume 6619, 66192G (2007) https://doi.org/10.1117/12.738582

KEYWORDS: Interferometers, Interferometry, Cladding, Structured optical fibers, Sensors, Phase interferometry, Michelson interferometers, Fiber optics, Optical fibers, Refractive index

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Proceedings Article | 23 May 2005 Paper

Intensity based luminescent optical fiber oxygen sensor using quantum dots

Pedro Jorge, M. Mayeh, R. Benrashid, P. Caldas, J. Santos, Faramarz Farahi

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.623643

KEYWORDS: Oxygen, Ruthenium, Light emitting diodes, Luminescence, Sensors, Nanocrystals, Quantum dots, Optical fibers, Sol-gels, Blue light emitting diodes

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Proceedings Article | 23 May 2005 Paper

Self-referenced intensity based optical fiber temperature probes for luminescent chemical sensors using quantum dots

P. Jorge, M. Mayeh, R. Benrashid, P. Caldas, J. Santos, F. Farahi

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.623392

KEYWORDS: Temperature metrology, Luminescence, Optical fibers, Light emitting diodes, Sensors, Quantum dots, Optical filters, Chemical fiber sensors, Multiplexing, Thin films

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Proceedings Article | 8 December 2004 Paper

Applications of nanoparticles in optical chemical and biological sensors

Faramarz Farahi, Pedro Jorge, Mona Mayeh, Ramazan Benrashid, Paulo Caldas, Jose Santos

Proceedings Volume 5590, (2004) https://doi.org/10.1117/12.580742

KEYWORDS: Luminescence, Light emitting diodes, Sensors, Oxygen, Ruthenium, Nanocrystals, Temperature metrology, Semiconductors, Nanoparticles, Quantum dots

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Proceedings Article | 9 June 2004 Paper

Optical temperature measurement configuration for fluorescence-based oxygen sensors

P. Jorge, P. Caldas, Carla Rosa, A. Oliva, M. Marques, Jose Santos

Proceedings Volume 5502, (2004) https://doi.org/10.1117/12.566591

KEYWORDS: Oxygen, Temperature metrology, Luminescence, Sensors, Ruthenium, Optical filters, Absorption filters, Signal detection, Optical testing, Environmental sensing

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Showing 5 of 25 publications

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