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Proceedings Paper

Short-length long period fiber grating for torsion sensing applications
Author(s): Marta Nespereira; João M. P. Coelho; José Manuel Rebordão
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Paper Abstract

The response of short-length CO2 -induced Long Period Fiber Gratings (LPFGs) sensors to torsion is reported. While engraving, the fiber is submitted to high tension allowing to obtain gratings with shorter lengths, one order of magnitude lower than the usual. Also, the fiber was only irradiated in one side, creating an asymmetrical profile leading to highly birefringent gratings. Good sensitivity to axial twists is demonstrated, with values up to 0.12 nm/(rad/m) for the resonant wavelength shift, and better than 0.03 dBm/(rad/m) for the variation in the intensity (attenuation). Discrimination between rotation direction, clockwise and counterclockwise, can be obtained.

Paper Details

Date Published: 22 August 2017
PDF: 4 pages
Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104531Z (22 August 2017); doi: 10.1117/12.2272725
Show Author Affiliations
Marta Nespereira, Univ. de Lisboa (Portugal)
João M. P. Coelho, Univ. de Lisboa (Portugal)
José Manuel Rebordão, Univ. de Lisboa (Portugal)

Published in SPIE Proceedings Vol. 10453:
Third International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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