authors |
Correia, SFH; Antunes, P; Pecoraro, E; Lima, PP; Varum, H; Carlos, LD; Ferreira, RAS; Andre, PS |
nationality |
International |
journal |
SENSORS |
author keywords |
fiber Bragg gratings; optical fiber sensors; relative humidity; organo-silica hybrid; structure health monitoring |
keywords |
MOISTURE; RANGE; GEL; CONCRETE; COMPLEX; DESIGN; FILM |
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. |
publisher |
MDPI AG |
issn |
1424-8220 |
year published |
2012 |
volume |
12 |
issue |
7 |
beginning page |
8847 |
ending page |
8860 |
digital object identifier (doi) |
10.3390/s120708847 |
web of science category |
Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation |
subject category |
Chemistry; Electrochemistry; Instruments & Instrumentation |
unique article identifier |
WOS:000306796500024
|