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

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Viegas, D (Author) Other; Goicoechea, J (Author) Other; Corres, JM (Author) Other; Santos, JL (Author) FCUP; Ferreira, LA (Author) Other; Araujo, FM (Author) Other; Matias, IR (Author) Other

Journal

Title: Measurement Science and Technology

Vol. 20

Final page: 034002

ISSN: 0957-0233

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 48 Citations

Scopus - 55 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-003-MZP

DOI: 10.1088/0957-0233/20/3/034002

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific