We report the implementation of vector bending sensors using long-period gratings (LPGs) UV-inscribed in flat-clad, four-core and D-shaped fibres. Our experiments reveal a strong fibre-orientation dependence of the spectral response when such LPGs are subjected to dynamic bending, which provided an opportunity to realize curvature measurement with direction recognition.
- bend sensor
- long-period grating
- special shape fibre
Zhao, D., Zhou, K., Chen, X. F., Zhang, L., Bennion, I., Flockhart, G. M. H., MacPherson, W. N., Barton, J. S., & Jones, J. D. C. (2004). Implementation of vectorial bend sensors using long-period gratings UV-inscribed in special shape fibres. Measurement Science and Technology, 15(8), 1647-1650. https://doi.org/10.1088/0957-0233/15/8/037