Publicacoes - INESC TEC

Publicações

Publicações por Orlando Frazão

1999

<title>Experimental results on high-bit-rate optical synchronization of RZ soliton-type signals</title>

Autores
Tavares, PM; Frazao, O; Cunha, A; Ribeiro, LB; da Rocha, JF;

Publicação
18th Congress of the International Commission for Optics

Abstract

2003

<title>Thermal behavior of Bragg gratings formed in germanosilicate fiber</title>

Autores
Lima, MJN; Teixeira, ALJ; Frazao, O; Andre, PSB; da Rocha, JRF;

Publicação
Photonics, Devices, and Systems II

Abstract

2010

<title>Temperature and strain independent torsion sensor using a Sagnac interferometer based on a suspended twin-core fibre</title>

Autores
Silva, RM; Kobelke, J; Schuster, K; Frazão, O;

Publicação
Fourth European Workshop on Optical Fibre Sensors

Abstract

2008

TEMPERATURE SENSOR USING Hi-Bi ERBIUM-DOPED FIBER LOOP MIRROR

Autores
Frazao, O; Egypto, D; Bittencourt, LA; Giraldi, MTMR; Marques, MB;

Publicação
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS

Abstract
In this letter, a temperature sensor using a fiber loop mirror containing a piece of highly birefringent erbium doped fiber is presented. A Hi-Bi PANDA erbium-doped silica fiber was used and compared with the conventional Hi-Bi PANDA fiber. Different results for strain and temperature sensitivity were obtained. The temperature coefficient sensitivity was -2.22 nm/degrees C and significantly higher when compared with others conventional Hi-Bi fibers. Strain experiments were also performed. (C) 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3152-3154 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23907

FecharLer Abstract

2011

Simultaneous measurement of strain and temperature using fiber Bragg grating sensors embedded in hybrid composite laminates

Autores
Ferreira, MS; Vieira, J; Frias, C; Frazao, O;

Publicação
MEASUREMENT SCIENCE & TECHNOLOGY

Abstract
The use of fiber Bragg grating sensors embedded in hybrid composite laminates for simultaneous measurement of strain and temperature is proposed. The hybrid structure, formed by a pre-impregnated thermoset and thermoplastic composites, contains one single fiber Bragg grating embedded in each material, connected in series with each other. A different response is observed when the smart composite laminate is subjected to strain and to temperature. This is expected due to the distinct properties presented by each material. The rms deviation obtained for a temperature range between 20 and 60 degrees C is +/- 0.97 degrees C and for a strain range from 0 to 1100 mu epsilon is +/- 13.04 mu epsilon.

FecharLer Abstract

2011

Simultaneous measurement of curvature and strain using a suspended multicore fiber

Autores
Silva, RM; Ferreira, MS; Kobelke, J; Schuster, K; Frazao, O;

Publicação
OPTICS LETTERS

Abstract
A suspended multicore fiber sensor for simultaneous measurement of curvature and strain is proposed. The spectral response shows evidences of several interferences arising from the seven cores of the fiber. Once the sensing head presents different sensitivities for curvature and strain measurements, these physical parameters can be discriminated by using the matrix method. The rms deviations are +/- 19m(-1) and +/- 12:90 mu epsilon for curvature and strain measurements, respectively. (C) 2011 Optical Society of America

FecharLer Abstract