Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/9611
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 |
URI: | http://hdl.handle.net/10773/9611 |
DOI: | 10.3390/s120708847 |
ISSN: | 1424-8220 |
Appears in Collections: | DECivil - Artigos |
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