Optical Fiber Sensing
Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. Optical detection system of partial discharges on insulator strings of high voltage transmission lines / Sistema de detecÃÃo Ãptica de descargas parciais em cadeias de isoladores de linhas de transmissÃo de alta tensÃo
Leakage current monitoring is frequently used to evaluate the degradation in the insulation capacity of insulator strings of overhead transmission lines, due to pollution. The pollutants accumulation over the surface of the insulators strings, together with humidity, lead to an increase in the current leak over the insulatorâs surface, in turn producing the
Publicado em: 2008
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14. Fluid insertion related processes for sensing using photonic crystal fibers / Processos relacionados a inserção de fluidos para sensoriamento com fibras de cristal fotonico
This work presents studies of how to insert fluids (liquid and gas) into microstructured optical fibers, especially photonic crystal fibers, also known as PCF?s. These optical fibers possess air holes that run along its entire length. They can be divided into two major groups: solid core fibers that guide light by total internal reflection and hollow core fi
Publicado em: 2007
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15. EFFECTS AND APPLICATIONS OF NON-HOMOGENEOUS STRAINS IN BRAGG GRATINGS / EFEITOS E APLICAÇÕES DE DEFORMAÇÕES NÃO HOMOGÊNEAS EM REDES DE BRAGG
Fiber Bragg gratings (FBG) are modulations in the effective refractive index of optical fibers, introduced in a small length along the fiber core. Such components operate as narrow band reflective filters, that is, when illuminated by a broad-band light source, they reflect a narrow spectral band centered at a specific wavelength, the Bragg wavelength. This
Publicado em: 2005
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16. DESENVOLVIMENTO DE TRANSDUTORES A FIBRA ÓPTICA PARA COMPLETAÇÃO INTELIGENTE DE POÇOS / DEVELOPMENT OF OPTICAL FIBER TRANSDUCERS FOR INTELLIGENT WELL COMPLETION
Optical fibers are finding a growing range of new applications in the petroleum industry, which include, not only those already well established in telecommunications, but also in novel sensing technologies. Possibility of dense multiplexing, continuous distributed measurements, long distances between measurement points and electronic circuits, and explosion
Publicado em: 2004
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17. Detection of Yersinia pestis fraction 1 antigen with a fiber optic biosensor.
A fiber optic biosensor was used to detect the fraction 1 (F1) antigen from Yersinia pestis, the etiologic agent of plague. The instrument employs an argon ion laser (514 nm) to launch light into a long-clad fiber and measures the fluorescence produced by an immunofluorescent complex formed in the evanescent wave region. This sensing area is a short section