2010
Authors
Silva, C; Coelho, JMP; Caldas, P; Frazao, O; Jorge, PAS; Santos, JL;
Publication
FIBER AND INTEGRATED OPTICS
Abstract
In the field of aqueous environment studies, long-period fiber gratings are very attractive for the real-time monitoring of physical parameters, such as temperature and salinity. However, due to the fiber jacket removal, these are fragile devices when applied in real conditions, where mechanical loads and contamination with algae and other organic materials must be taken into account. This work describes a refractive index sensing head that has been developed and characterized for in situ measurement of water salinity and resistance to hard conditions.
2010
Authors
Caldas, P; Jorge, PAS; Araujo, FM; Ferreira, LA; Rego, G; Santos, JL; Berneschi, S; Cosi, F; Soria, S; Pelli, S; Conti, GN;
Publication
FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS
Abstract
In this work we describe the characterization of high Q optical microresonators using an all fiber based system. Silica microspheres fabricated on a fiber tip by electric arc discharge are characterized using a simple interrogation system based on an adiabatic fiber taper coupler and on the collection of scattered radiation by a multimode fiber.
2002
Authors
Jorge, PAS; Caldas, P; Ferreira, LA; Ribeiro, ABL; Santos, JL; Farahi, F;
Publication
OFS 2002: 15TH OPTICAL FIBER SENSORS CONFERENCE TECHNICAL DIGEST
Abstract
Theoretical and experimental results were presented which validated a new dual interferometric configuration with serrodyne processing for the remote sensing of electrical current. Linearity and waveform reproduction at 50 Hz were observed and a current resolution (˜22.4 ArmsHz- 1/2) was obtained. The utilization of the proposed interferometric concept to simultaneously perform metering and relaying current measurements was also addressed. © 2002 IEEE.
2004
Authors
Jorge, PAS; Caldas, P; Rosa, CC; Oliva, AG; Marques, MB; Santos, JL;
Publication
Second European Workshop on Optical Fibre Sensors
Abstract
2007
Authors
Frazão, O; Caldas, P; Santos, JL; Araújo, FM; Ferreira, LA;
Publication
Third European Workshop on Optical Fibre Sensors
Abstract
2008
Authors
Silva, SFO; Frazão, O; Caldas, P; Santos, JL; Araújo, FM; Ferreira, LA;
Publication
19th International Conference on Optical Fibre Sensors
Abstract
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