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Proceedings Paper

Temperature independent torsion sensor based on modal interferometry in ultra high-birefringent photonic crystal fiber
Author(s): Orlando Frazão; C. Jesus; José M. Baptista; José L. Santos; Philippe Roy
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Paper Abstract

A fiber-optic sensor for torsion measurement, based on a two-LP-mode operation in ultra high birefringent photonic crystal fiber (PCF) is described. The structure of the photonic crystal fiber presents two large asymmetric holes adjacent to the core fiber. When linearly polarized light is injected in x or in y directions, respectively, two different interferometers can be obtained. In one of these cases, as torsion is applied to the ultra Hi-Bi PCF a beat between the two interferometers is formed due to the simultaneous excitation of the two polarization states. The detection technique to read the torsion sensor is based on the analysis of the Fast Fourier Transform (FFT), which is an alternative and simple solution. The sensor exhibited reduced sensitivity to temperature and also to strain.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75033K (5 October 2009); doi: 10.1117/12.834745
Show Author Affiliations
Orlando Frazão, INESC Porto (Portugal)
Univ. do Porto (Portugal)
C. Jesus, INESC Porto (Portugal)
José M. Baptista, Univ. da Maderia (Portugal)
INESC Porto (Portugal)
José L. Santos, Univ. do Porto (Portugal)
INESC Porto (Portugal)
Philippe Roy, XLIM, CNRS, Univ. de Limoges (France)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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