Sensors · 2012 · 122 citations · 42 references
EngineeringMaterials EngineeringMaterials ScienceFunctional MaterialsOptical MaterialsSensorsCoatingsHumidity SensorsOptical FibersOptical SensingOptical SensorsStructural Health MonitoringBragg Grating SensorsFiber SensorsFiber-optic SensingFiber-optic SensorsOptical Fiber SensorsOptical Humidity SensorsRelative Humidity MeasurementRelative Humidity Sensing
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.
42
Relative humidity sensor with optical fiber Bragg gratings
Pascal Kronenberg, Pramod K. Rastogi, Philippe Giaccari et al. · Optics Letters · 2002 · 273 citations · Full text
Engineering, Mechatronics Engineering, Optical Materials +16