A fibre optic humidity sensor based on a long-period fibre grating coated with a thin film of SiO2 nanospheres

被引：54
|
作者：
Viegas, D. [1 ,2 ]
Goicoechea, J. [3 ]
Corres, J. M. [3 ]
Santos, J. L. [1 ,2 ]
Ferreira, L. A. [1 ]
Araujo, F. M. [1 ]
Matias, I. R. [3 ]
机构：
[1] INESC Porto, P-4200465 Oporto, Portugal
[2] Univ Porto, Fac Ciencias, P-4169007 Oporto, Portugal
[3] Univ Publ Navarra, Pamplona 31006, Spain
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 2009年 / 20卷 / 03期
关键词：
humidity sensor; long-period fibre grating; nanospheres; electrostatic self-assembly; DEPOSITION;
D O I：
10.1088/0957-0233/20/3/034002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：4
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