Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating
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Data
2012-07-01
Autores
Correia, Sandra F. H.
Antunes, Paulo
Pecoraro, Édison [UNESP]
Lima, Patricia P.
Varum, Humberto
Carlos, Luis D.
Ferreira, Rute A. S.
Andre, Paulo S.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Mdpi Ag
Resumo
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.
Descrição
Palavras-chave
fiber Bragg gratings, optical fiber sensors, relative humidity, organo-silica hybrid, structure health monitoring
Como citar
Sensors. Basel: Mdpi Ag, v. 12, n. 7, p. 8847-8860, 2012.