Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
    Publications

    Publications by Orlando Frazão

    1999

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

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

    Publication
    18th Congress of the International Commission for Optics

    Abstract

    2003

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

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

    Publication
    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>

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

    Publication
    Fourth European Workshop on Optical Fibre Sensors

    Abstract

    2008

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

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

    Publication
    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

    CloseRead Abstract

    2011

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

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

    Publication
    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.

    CloseRead Abstract

    2011

    Simultaneous measurement of curvature and strain using a suspended multicore fiber

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

    Publication
    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

    CloseRead Abstract
    • 38
    • 89