2009
Autores
Díaz-Herrera, N; Viegas, D; Jorge, PAS; Navarrete, MC; Ferreira, LA; Araújo, FM; Santos, JL; González-Cano, A;
Publicação
20th International Conference on Optical Fibre Sensors
Abstract
2011
Autores
Viegas, D; Navarrete, MC; Díaz-Herrera, N; González-Cano, A; Santos, JL; Araújo, FM;
Publicação
21st International Conference on Optical Fiber Sensors
Abstract
2010
Autores
Viegas, D; Carvalho, JP; Coelho, L; Santos, JL; Ferreira, LA; Araújo, FM; Frazão, O;
Publicação
Fourth European Workshop on Optical Fibre Sensors
Abstract
2010
Autores
Díaz-Herrera, N; González-Cano, A; Viegas, D; Santos, JL; Navarrete, M; Esteban,;
Publicação
Fourth European Workshop on Optical Fibre Sensors
Abstract
2012
Autores
Coelho, L; Tafulo, PAR; Jorge, PAS; Santos, JL; Viegas, D; Schuster, K; Kobelke, J; Frazao, O;
Publicação
OPTICS LETTERS
Abstract
In this Letter, a hybrid interferometer for simultaneous measurement of the partial pressures of O-2 and CO2 mixtures is reported. The sensing head consists in the combination of two interferometric structures, one a Fabry-Perrot cavity and the other a modal interferometer. The intrinsic Fabry-Perot was formed by splicing a single mode fiber with a graded index fiber length that was then subjected to chemical etching creating an air cavity. The second interferometer is based on a splice of a pure silica tube in series with the Fabry-Perot. It was observed for a particular gas that its refractive index changes with pressure variation in a specific way, a characteristic that permitted the simultaneous measurement of partial pressures of CO2 and O-2 with rms deviations of similar to +/- 48.7 kPa and similar to +/- 20.1 kPa, respectively. (C) 2012 Optical Society of America
2010
Autores
Viegas, D; Hautakorpi, M; Guerreiro, A; Santos, JL; Ludvigsen, H;
Publicação
FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS
Abstract
We propose and theoretically study a novel surface-plasmon-resonance sensor based on an H-shaped, elliptical-core optical fibre. The two grooves of the H-fibre are coated with a thin, uniform metal layer that in turn is covered with a high-index dielectric layer to allow broad spectral tunability. The sensor maintains linear polarization and facilitates effortless splicing. Electromagnetic mode analysis indicates a sensitivity of 1800 nm/RIU (refractive-index unit) for aqueous analytes.
The access to the final selection minute is only available to applicants.
Please check the confirmation e-mail of your application to obtain the access code.