Optical Fiber Relative Humidity Sensor Based on a FBG with a Di-Ureasil Coating
| 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 |
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impact metrics
| journal analysis (jcr 2019): |
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| journal impact factor | 3.275 |
| 5 year journal impact factor | 3.427 |
| category normalized journal impact factor percentile | 74.528 |
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