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Title: Optical fiber relative humidity sensor based on a FBG with a di-ureasil coating
Author: Correia, S.
Antunes, P.
Pecoraro, E.
Lima, P.
Varum, H.
Carlos, L. D.
Ferreira, R.
André, P.
Keywords: Fiber Bragg gratings
Optical fiber sensors
Relative humidity
Organo-silica hybrid
Structure health monitoring
Issue Date: 2012
Publisher: MDPI
Abstract: In this work we proposed a relative humidity (RH) sensor based on a Bragg grating written in an optical fiber, associated with a coating of organo-silica hybrid material prepared by the sol-gel method. The organo-silica-based coating has a strong adhesion to the optical fiber and its expansion is reversibly affected by the change in the RH values (15.0–95.0%) of the surrounding environment, allowing an increased sensitivity (22.2 pm/%RH) and durability due to the presence of a siliceous-based inorganic component. The developed sensor was tested in a real structure health monitoring essay, in which the RH inside two concrete blocks with different porosity values was measured over 1 year. The results demonstrated the potential of the proposed optical sensor in the monitoring of civil engineering structures.
Peer review: yes
DOI: 10.3390/s120708847
ISSN: 1424-8220
Appears in Collections:DECivil - Artigos

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