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Optical Engineering

Optical fiber refractometer based on a Fabry-Pérot interferometer
Author(s): Susana F. O. Silva; Orlando Frazão; Paulo Caldas; José Luís Santos; F. M. Araujo; Luís Alberto Ferreira
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Paper Abstract

A fiber optic sensor for liquid refractive index measurement based on a Fabry-Pérot interferometer is described. The interferometer is achieved between the reflection of a short fiber Bragg grating and the Fresnel reflection from the cleaved fiber end. This fiber end is then in contact with the liquid sample to provide refractive index measurements. The sensor is characterized by immersing the fiber tip in distilled water with different concentrations of ethylene glycol. A linear relation of the interferometer fringe visibility with refractive index variation is observed, and a resolution of ~10-3 is obtained. It is also shown that the sensor operation is independent of temperature effects, other than the one related to temperature-induced change of the liquid refractive index.

Paper Details

Date Published: 1 May 2008
PDF: 5 pages
Opt. Eng. 47(5) 054403 doi: 10.1117/1.2931527
Published in: Optical Engineering Volume 47, Issue 5
Show Author Affiliations
Susana F. O. Silva, INESC Porto (Portugal)
Orlando Frazão, INESC Porto (Portugal)
Paulo Caldas, INESC Porto (Portugal)
José Luís Santos, Univ. do Porto (Portugal)
F. M. Araujo, INESC Porto (Portugal)
Luís Alberto Ferreira, FiberSensing - Sistemas Avançados de Monitorização, S.A. (Portugal)

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