Journal
SENSORS
Volume 12, Issue 7, Pages 8847-8860Publisher
MDPI
DOI: 10.3390/s120708847
Keywords
fiber Bragg gratings; optical fiber sensors; relative humidity; organo-silica hybrid; structure health monitoring
Funding
- Fundacao para a Ciencia e Tecnologia (FCT)
- FEDER
- COMPETE [PTDC/CTM/101324/2008, PEst-C/CTM/LA0011/2011]
- [SFRH/BD/41077/2007]
- [SFRH/BPD/34365/2006]
- [SFRH/BPD/76735/2011]
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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.
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