In this work is reported the bending sensing characteristics of a long-period grating produced point-by-point with a 266 nm Nd:YAG laser. Spectral changes of the transducer subjected to bends with curvatures from 0 to 3.13 m^-1 were investigated. The magnitude of the bend-induced wavelength shift is nonlinear and dependent on the rotation of the cylindrical fibre relative to the bending plane. For each constant bending applied to the grating, the fibre was rotated around its axis in angular steps of 15º, within the angular range from 0 to 180º. An artificial neural network model was applied for identifying the curvatures, resulting in a root-mean-square error of 0.028 m^-1.

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750342 (5 October 2009); doi: 10.1117/12.834397

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