
Proceedings Paper
Fabry-Pérot cavities based on chemical etching for high temperature and strain sensingFormat | Member Price | Non-Member Price |
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Paper Abstract
In this paper, two novel hybrid multimode/single mode fiber Fabry-Pérot (FP) cavities were compared. The cavities
fabricated by chemical etching are presented as high temperature and strain sensors. In order to produce this FP cavity a
single mode fiber was spliced to a graded index multimode fiber with 62.5 μm core diameter. The multimode fiber was
cut approximately 150 μm away from the splice. Then the tip of the fiber containing the multimode fiber segment was
dipped into a solution of 48% of HF during 8 minutes, creating a concavity due to the fact that the reaction between HF
and the germanium doped fiber core is much faster than the reaction between HF and the pure silica cladding. By this
method a concavity of approximately 100 μm deep was created at the fiber tip. Two different FP cavities can be
fabricated. The first cavity is obtained when a spliced with an identical tip concavity fiber (Sensor A) and the second is
created when a tip concavity is spliced to a single mode fiber (Sensor B). The Fabry-Perot cavities were tested as a high
temperature sensor in the range between room temperature and 800°C and as strain sensors. A reversible shift of the
interferometric peaks with temperature allowed to estimate a sensitivity of 0.75 ± 0.03 pm/°C and 0.98 ± 0.04 pm/°C for
the sensor A and B respectively. For strain measurement sensor A demonstrated a sensitivity of 1.85 ± 0.07 pm/με and
sensor B showed a sensitivity of 3.14 ± 0.05 pm/με. The sensors demonstrated the feasibility of low cost fiber optic
sensors for high temperature and strain.
Paper Details
Date Published: 26 July 2011
PDF: 7 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 800141 (26 July 2011); doi: 10.1117/12.892090
Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)
PDF: 7 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 800141 (26 July 2011); doi: 10.1117/12.892090
Show Author Affiliations
Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)
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