2004
Autores
Frazao, O; Rego, G; Araujo, FM; Ferreira, LA; Salgado, HM; Santos, JL;
Publicação
SECOND EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS: PROCEEDINGS
Abstract
A new sensing configuration is proposed for simultaneous measurement of strain and temperature that relies on a single long period grating written by the electric arc technique. The underlying principle is the azimuthal asymmetry induced by the electric arc fabrication technique, which results in a device with polarization dependent insertion loss sensitive to both temperature and strain. With the proposed configuration, resolutions of +/- 2.8 degreesC/rootHz and +/- 13.9 muepsilon/rootHz are obtained for temperature and strain measurements, respectively.
2004
Autores
Rego, G; Marques, PVS; Salgado, HM; Santos, JL;
Publicação
SECOND EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS: PROCEEDINGS
Abstract
The radiation emitted by an optical fiber during heating due to an electric arc discharge was detected using a Cronin spectrometer. The fitting of the emission spectrum to the blackbody radiation, allowed the estimation of the temperature range attained by the fiber.
2003
Autores
Melo, M; Frazao, O; Romero, R; Andre, PS; Marques, PVS; Salgado, HM; Santos, JL;
Publicação
PROCEEDINGS OF THE INTERNATIONAL 2003 SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONICS CONFERENCE - IMOC 2003, VOLS I AND II
Abstract
In this paper we present and evaluate the spectral response of uniform gratings written in different tapered core sections of single mode fibre. This combination of uniform gratings and tapers leads to three, types of Chirped Fibre Bragg Gratings with different reflection spectra and different mechanical properties. These devices are characterized in function of the applied strain, showing interesting chirp tunability.
2008
Autores
Lima, SEU; Frazão, O; Araújo, FM; Ferreira, LA; Miranda, V; Santos, JL;
Publicação
19th International Conference on Optical Fibre Sensors
Abstract
2010
Autores
Lima, SEU; Frazão, O; Farias, RG; Araújo, FM; Ferreira, LA; Miranda, V; Santos, JL;
Publicação
Fourth European Workshop on Optical Fibre Sensors
Abstract
2010
Autores
Lima, SEU; Frazão, O; Farias, RG; Araújo, FM; Ferreira, LA; Miranda, V; Santos, JL;
Publicação
Fourth European Workshop on Optical Fibre Sensors
Abstract
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