ETDs @PUC-Rio
| Título: | APPLICATIONS OF FIBER BRAGG GRATING SENSORS IN THE MEASUREMENT OF PH AND OF STRAIN IN HARD THIN FILMS | ||||||||||||||||||||||||||||||||||||
| Autor: |
SULLY MILENA MEJIA QUINTERO |
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| Colaborador(es): |
ARTHUR MARTINS BARBOSA BRAGA - Orientador ADRIANA LUCIA CERRI TRIQUES - Coorientador |
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| Catalogação: | 07/NOV/2006 | Língua(s): | PORTUGUESE - BRAZIL |
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| Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||
| Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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| Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=9243&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=9243&idi=2 |
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| DOI: | https://doi.org/10.17771/PUCRio.acad.9243 | ||||||||||||||||||||||||||||||||||||
| Resumo: | |||||||||||||||||||||||||||||||||||||
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This work treats of two different applications of optical
fiber Bragg grating
sensors. The first application consists of a pH sensing
technique that employs
optical fiber to permanent and continuously monitor the pH
in depleted and
injection oil wells. In this application, the Bragg
gratings are coupled by a
transduction mechanism to a polymeric system which
responds to pH variations
with a large volume change. The response time as well as
the swelling factor of
the polymeric system at pH 3, 4, 5, and 6 have been
characterized in aqueous
solutions with dissolved salts in concentrations typical
of those found in
formation waters. Experiments have been carried out at
room temperature and
pressures, in the presence of oil, and after
pressurization up to 5000 psi. Several
mechanisms of transduction have been designed,
constructed, and tested in
solutions similar to the formation waters. The sensitivity
of the technique and the
main sources of uncertainties related to the pH
measurement have been
investigated. Also, the functionality of the mechanisms
has been evaluated
aiming at a future installation in the petroleum wells.
The second application
investigated is a technique for in situ measurement of the
residual stress induced
in hard thin films during deposition by RF magnetron
sputtering. The sensing
technique consists of a cantilever steel beam. One of the
surfaces of the beam is
instrumented using optical fiber Bragg gratings; the
opposite face is exposed to
the ion flux that originates the thin film. The sensing
system is installed in a
vacuum chamber while the interrogating apparatus remains
outside. The
prototype has been characterized with respect to
variations of the magnetic field
and the temperature inside the chamber. Measurements of
the beam strain have
been carried out during deposition of silica, indium-
titanium oxide, and silicon
carbide thin films. The residual stresses have been
calculated and the results
compared with data obtained using perfilometry. Residual
stress values varying
from 6 MPa up to 200 MPa have been obtained during the
different deposition processes.
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