Modelagem numérica de uma fibra óptica microestruturada para sensoriamento distribuído de pressão

• Ano de defesa: 2010
• Autor(a) principal: Miraglia, Rodrigo Cesar Ribeiro
• Orientador(a): Matos, Christiano José Santiago de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Presbiteriana Mackenzie
• Programa de Pós-Graduação: Engenharia Elétrica
• Departamento: Engenharia Elétrica
• País: BR
• Palavras-chave em Português: fibras microestruturadas; fibras de cristal fotônico; birrefringência; POTDR (Polarimetric Optical Time Domain Reflectometry); OFDR (Optical Frequency-Domain Reflectometry), sensores ópticos
• Palavras-chave em Inglês: microstructured fibers; photonic crystal fibers; birefringence; POTDR (Polarization Optical Time-Domain Reflectometry); OFDR (Optical Frequency-Domain Reflectometry); optical sensors
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: http://dspace.mackenzie.br/handle/10899/24310

Sensors based on optical fibers are being increasingly used in hostile environments for measuring pressure, temperature, stress, chemical and biological parameters, etc. These sensors have the advantage of having reduced size and weight, immunity to electromagnetic interference, of being chemically inert, and also allowing the distributed measurement of the respective parameter along the fiber. Microstructured optical fibers have characteristics that are relevant to sensing applications, such as freedom of design of their internal structure obtained by varying the diameter of the holes and the distances between them, among other parameters, which is not applicable in conventional optical fibers. The present work aims to use a microstructured optical fiber as a distributed sensor for hydrostatic pressure, using the POTDR (Polarization Optical Time-Domain Reflectometry) and the OFDR (Optical Frequency-Domain Reflectometry) measurement techniques. The application of hydrostatic pressure on the fiber changes its birefringence and, consequently, the evolution of the states of polarization, which is the parameter monitored by the techniques. By monitoring the changes of these states, it is possible to infer the changes in applied pressure. The study is undertaken via simulations and analysis, both performed in the software MatLab.