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- [www.ncbi.nlm.nih.gov] | PDF
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- [www.researchgate.net] | PDF
- [www.ncbi.nlm.nih.gov] | PDF
- [www.ncbi.nlm.nih.gov] | PDF
- [citeseerx.ist.psu.edu] | PDF
- [www.mdpi.com] | PDF
- [europepmc.org] | PDF
- [ria.ua.pt] | PDF
- [repositorio.unesp.br] | PDF
Tools
Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating
,
Luis D. Carlos ,
Rute A. S. Ferreira,
Paulo S. André
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.