CAP - Indexed Articles in Conferences
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ItemEspalhamento estimulado de brillouin sem e com realimentação( 2006) Manuel Joaquim Marques ; José Luís Santos ; José Manuel Baptista ; Orlando Frazão ; José Alberto Marques
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ItemAumento do limiar do espalhamento estimulado de Brillouin em fibra por modulação da temperatura( 2006) Manuel Joaquim Marques ; Joel Pedro Carvalho
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ItemTenperature independent strain/load sensor using a highly birefingent photonic crystal fibre loop mirror( 2007) José Alberto Marques ; José Luís Santos ; José Manuel Baptista ; Orlando Frazão
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ItemStudy of LPG-assisted fibre modal Michelson interferometers with coherence addressing and heterodyne interrogation( 2007) Gaspar Rego ; Luís Alberto Ferreira ; Francisco Araújo ; Manuel Joaquim Marques ; Paulo Caldas ; José Luís Santos
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ItemEvaluation of coupling losses in hollow-core photonic crystal fibres( 2007) Orlando Frazão ; Filipe Magalhães ; Luís Alberto Ferreira ; Francisco Araújo ; Joel Pedro Carvalho ; Oleg Ivanov ; José Luís Santos
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ItemFABRICATION OF AN INTEGRATED OPTICAL SENSOR WITH HIGH SENSITIVITY AND HIGH DYNAMIC RANGE BASED ON A MACH-ZEHNDER INTERFEROMETRIC CONFIGURATION( 2007) Paulo Vicente Marques ; António Leite ; José Luís Santos ; Daniel Alexandre ; Luís André Fernandes ; Jaime Viegas ; Paulo Moreira
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ItemSimultaneous determination of oxygen and temperature using quantum dots and a ruthenium complex( 2007) José Luís Santos ; Ramenzan Benrashid ; Faramarz Farahi ; Pedro Jorge ; António Silva
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ItemModal Interferometer based on a single non-adiabatic fiber taper( 2007) Paulo Caldas ; Luís Alberto Ferreira ; Francisco Araújo ; Orlando Frazão ; José Luís Santos
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ItemThermal Current Sensor based on Metal Coated Hi-Bi Fiber Loop Mirror( 2007) Orlando Frazão ; S. F. Santos ; José Manuel Baptista ; Manuel Joaquim Marques ; Bruno Marques ; Sérgio Mendonça ; Javier Cruz
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ItemNovel Fibre Optic Based Structures for Sensing Applications( 2007) Orlando Frazão ; Francisco Araújo ; Paulo Caldas ; Gaspar Rego ; José Luís Santos ; Luís Alberto FerreiraOptical sensing based on optical fibres can be boosted to new performance levels by combining the fibre waveguide with other fibre structures, such as Bragg gratings, long period gratings, tapers, couplers, multimode interference devices and even microspheres. Along this path, it will be shown the feasibility to have new fibre optic interferometers highly sensitive to environmental parameters, particularly to the refractive index of the surrounding medium, to curvature, to flow and others. Also, it will be presented results that show the possibility to tune the intrinsic strain sensitivity of a fibre Bragg grating when this device and a fused taper are properly integrated. Finally, it will be described a fibre optic structure for simultaneous measurement of strain and temperature, which relies on the utilization of two cascaded fibre loop mirrors, containing one of them an Hi-Bi photonic crystal fibre, while the second one includes a length of internal elliptical cladding fibre
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ItemOrigin of Coupling to Antisymmetric Cladding Modes in Arc-Induced Long-Period Fiber Gratings( 2007) Oleg Ivanov ; Paulo Caldas ; Gaspar Rego
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ItemHigh resolution optomechanical system for assembly, characterization and packaging of microoptical devices( 2007) Orlando Frazão ; José Luís Santos ; Diana Viegas ; Pedro Jorge ; Marta Girão ; Jaime Viegas ; Luís Alberto Ferreira ; Francisco Araújo
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ItemCharacterization of railway traffic and its effects on a short span bridge by using a hybrid fibre optic / electrical measurement system( 2007) Luís Alberto Ferreira ; D. Ribeiro ; Rui Calçada ; Francisco Araújo ; R. Pimentel ; Cristina Barbosa ; Nuno Costa
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ItemHumidity sensor based on a long-period fiber grating coated with a SiO2-nanospheres film( 2008) Francisco Araújo ; José Luís Santos ; Luís Alberto Ferreira ; I. R. Matias ; Diana Viegas ; J. Goicoechea ; J. M. Corres
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ItemEstudo da fiabilidade de um sistema sensor óptico para controlo do enchimento de ecopontos( 2008) Manuel Joaquim Marques ; Patrícia Leitão
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ItemSensor baseado em redes de Bragg em fibra óptica polidas transversalmente( 2008) José Luís Santos ; Marta Girão ; Luís Alberto Ferreira ; Diana Viegas ; Francisco Araújo
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ItemRecent Advances on Optical Sensing Using Photonic Cristal Fibers( 2008) Manuel Joaquim Marques ; Francisco Araújo ; Orlando Frazão ; Joel Pedro Carvalho ; Filipe Magalhães ; José Luís Santos ; Luís Alberto FerreiraThe application of hollow-core photonic crystal fibers for gas sensing is reviewed and discussed. Some problems with splicing to standard fibers and gas diffusion into the core are addressed. Current work at INESC Porto in the development of sensing heads and interrogation units is also reported.
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ItemMethane Detection System Based on Wavelength Modulation Spectroscopy and Hollow-Core Fibres( 2008) Joel Pedro Carvalho ; Filipe Magalhães ; José Luís Santos ; Luís Alberto Ferreira ; Francisco AraújoAn optoelectronic system for detection and monitoring of methane has been developed and implemented. The signal processing technique used in the proposed system is based on Wavelength Modulation Spectroscopy (WMS). When associated with the revolutionary microstructured fibres, this scheme revealed an effective way to measure gas concentration. Aiming the optimization of the sensing head design, the methane diffusion time inside a hollow-core fibre was evaluated. An error of 2.8% between experimental and theoretical values was obtained, thus validating the adopted model. These results were very encouraging towards the implementation of a practical unit for remote gas monitoring applications.
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ItemFibre Bragg Gratings as Interrogation Elements for Surface Plasmon Resonance Sensors( 2009) Natalia Diaz-Herrera ; José Luís Santos ; A. González-Cano ; Diana Viegas ; Pedro Jorge ; M. C. Navarrete ; Luís Alberto Ferreira ; Francisco Araújo
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ItemDEVELOPMENT OF AN OPTOELECTRONIC GAS MONITORING UNIT BASED IN WAVELENGTH MODULATION SPECTROSCOPY( 2009) Francisco Araújo ; Joel Pedro Carvalho ; José Luís Santos ; Luís Alberto Ferreira ; Filipe MagalhãesRemote sensing of gas is a safety problem, which has already been widely addressed through the utilization of several technologies. In this work it is presented a novel optoelectronic portable gas monitoring unit based on the utilization of the wavelength modulation spectroscopy technique.