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Sensors 2012, 12(7), 8847-8860; doi:10.3390/s120708847
Article

Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating

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Received: 28 May 2012; in revised form: 20 June 2012 / Accepted: 25 June 2012 / Published: 27 June 2012
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Portugal)
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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.
Keywords: fiber Bragg gratings; optical fiber sensors; relative humidity; organo-silica hybrid; structure health monitoring fiber Bragg gratings; optical fiber sensors; relative humidity; organo-silica hybrid; structure health monitoring
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Correia, S.F.H.; Antunes, P.; Pecoraro, E.; Lima, P.P.; Varum, H.; Carlos, L.D.; Ferreira, R.A.S.; André, P.S. Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating. Sensors 2012, 12, 8847-8860.

AMA Style

Correia SFH, Antunes P, Pecoraro E, Lima PP, Varum H, Carlos LD, Ferreira RAS, André PS. Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating. Sensors. 2012; 12(7):8847-8860.

Chicago/Turabian Style

Correia, Sandra F. H.; Antunes, Paulo; Pecoraro, Edison; Lima, Patrícia P.; Varum, Humberto; Carlos, Luis D.; Ferreira, Rute A. S.; André, Paulo S. 2012. "Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating." Sensors 12, no. 7: 8847-8860.



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