Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 20, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/20/3/034002
Keywords
humidity sensor; long-period fibre grating; nanospheres; electrostatic self-assembly
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A novel sensing configuration for measuring humidity based on a long-period fibre grating coated with a thin film of silica nanospheres is proposed. The polymeric overlay is deposited on the grating using the electrostatic self-assembly technique. This thin film changes its optical properties when exposed to different humidity levels that translate into a shift of the resonance wavelength of the fibre grating. Wavelength shifts up to 12 nm in a relative humidity range from 20% to 80% are reported, and it is further demonstrated that such humidity sensitivity has negligible thermal dependence.
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