Temperature independent torsion sensor based on modal interferometry in ultra high-birefringent photonic crystal fiber

Orlando Frazão; C. Jesus; José M. Baptista; José L. Santos; Philippe Roy

doi:10.1117/12.834745

5 October 2009 Temperature independent torsion sensor based on modal interferometry in ultra high-birefringent photonic crystal fiber

Orlando Frazão, C. Jesus, José M. Baptista, José L. Santos, Philippe Roy

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75033K (2009) https://doi.org/10.1117/12.834745
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

Citation Download Citation

Orlando Frazão, C. Jesus, José M. Baptista, José L. Santos, and Philippe Roy "Temperature independent torsion sensor based on modal interferometry in ultra high-birefringent photonic crystal fiber", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75033K (5 October 2009); https://doi.org/10.1117/12.834745

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