Please use this identifier to cite or link to this item:
|Title:||Optical fiber relative humidity sensor based on a FBG with a di-ureasil coating|
Carlos, L. D.
|Keywords:||Fiber Bragg gratings|
Optical fiber sensors
Structure health monitoring
|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.|
|Appears in Collections:||DECivil - Artigos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.