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Proceedings Paper

Dynamic interrogation of long period gratings with modulated fibre Bragg gratings
Author(s): J. P. Carvalho; L. Coelho; L. Correia; O. Frazão; P. A. S. Jorge; J. M. Baptista; I. Dias; J. L. Santos; J. Weyl; M. J. Pontes; M. A. Martinez; A. P. Barbero; R. M. Ribeiro; A. J. G. Abelém; M. T. R. Giraldi
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Paper Abstract

It is reported a LPG dynamic interrogation technique based on the modulation of fibre Bragg gratings located in the readout unit that permits to attenuate the effect of the 1/f noise of the electronics in the resolution of the LPG-based sensing head. The concept is tested to detect variations of the external refractive index and a resolution of 2.0×10-4 NIR was achieved without system optimization. Additionally, the effect in the sensor resolution when introducing Erbium and Raman optical amplification is experimentally investigated.

Paper Details

Date Published: 9 September 2010
PDF: 4 pages
Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76532C (9 September 2010); doi: 10.1117/12.866444
Show Author Affiliations
J. P. Carvalho, INESC Porto (Portugal)
Univ. do Porto (Portugal)
L. Coelho, INESC Porto (Portugal)
L. Correia, Instituto Militar de Engenharia (Brazil)
O. Frazão, INESC Porto (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)
J. M. Baptista, INESC Porto (Portugal)
Univ. da Madeira (Portugal)
I. Dias, INESC Porto (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)
J. Weyl, Univ. Federal do Pará (Brazil)
M. J. Pontes, Univ. Federal do Espírito Santo (Brazil)
M. A. Martinez, Ctr. Federal de Educação Tecnológica Celso Suckow de Fonesca (Brazil)
A. P. Barbero, Univ. Federal Fluminense (Brazil)
R. M. Ribeiro, Univ. Federal Fluminense (Brazil)
A. J. G. Abelém, Univ. Federal do Pará (Brazil)
M. T. R. Giraldi, Instituto Militar de Engenharia (Brazil)


Published in SPIE Proceedings Vol. 7653:
Fourth European Workshop on Optical Fibre Sensors
José Luís Santos; Brian Culshaw; José Miguel López-Higuera; William N. MacPherson, Editor(s)

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