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Proceedings Paper

Fibre refractometer based on a Fabry-Pérot interferometer
Author(s): S. F. O. Silva; O. Frazão; P. Caldas; J. L. Santos; F. M. Araújo; L. A. Ferreira
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Paper Abstract

It is described a fibre optic sensor for liquid refractive index measurement based on the visibility variations of a Fabry-Perot interferometer with interfering waves generated in a short Bragg grating and in the fibre tip (Fresnel reflection) in contact with the liquid. The sensor was characterized emerging the fibre tip in distilled water with different concentrations of ethylene glycol. A linear relation was obtained, with a readout resolution of ≈ 10-3. It was also observed that the temperature direct cross sensitivity is residual.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700446 (16 May 2008); doi: 10.1117/12.786080
Show Author Affiliations
S. F. O. Silva, INESC Porto (Portugal)
O. Frazão, INESC Porto (Portugal)
Univ. do Porto (Portugal)
P. Caldas, INESC Porto (Portugal)
Univ. do Porto (Portugal)
Escola Superior de Tecnologia e Gestão de Viana do Castelo (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)
F. M. Araújo, INESC Porto (Portugal)
L. A. Ferreira, INESC Porto (Portugal)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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