Sistema para medida simultânea de temperatura e deformação com redes de Bragg em 800 nm / Simultaneous measurement of temperature and strain using fiber Bragg gratings written at 800 nm

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

01/11/2012

RESUMO

In recent years, fiber Bragg gratings (FBGs) have been frequently used as strain and temperature sensors. Several studies have tackled the problem of distinguishing between these two physical parameters using a dual-wavelength sensor. Although these sensors have shown good results, they have a few drawbacks, one of them being the need for two light sources with different wavelengths. We present an approach for simultaneous strain and temperature sensing which uses only one light source. The method relies on writing FBGs with nearby wavelengths (for instance, at 810 and 860 nm) at the same section of the fiber. Even though the Bragg wavelengths are separated by just a few nanometers (about 50 nm), it is possible to accurately measure variations in strain and temperature. One of the major advantages of this approach is the use of a unique light source, what reduces substantially the system cost. Another advantage is the lower cost of array detectors at 800 nm when compared to those of telecom wavelengths (1,55 μm).

ASSUNTO(S)

fiber bragg gratings fibras ópticas optical fibers redes de bragg sensor de temperatura e deformação temperature and strain sensor

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