This work addresses a humidity sensor using long-period fiber gratings (LPG) coated with silica nanospheres film. SiO₂-nanospheres coating is deposited onto the LPG using the electrostatic self-assembly technique (ESA). The polymeric overlay changes its optical properties when exposed to different humidity levels, resulting in a shift of the resonance wavelength of the LPG. The obtained results are accordant with the theoretical simulations. Wavelength shifts up to 12nm in a humidity range from 20% to 80% are reported, maintaining the same dependence at different temperatures.

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044O (16 May 2008); doi: 10.1117/12.786059

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)