Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
Sensors (Basel). 2012;12(7):8847-60. doi: 10.3390/s120708847. Epub 2012 Jun 27.
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.
在这项工作中,我们提出了一种基于光纤中写入的布拉格光栅的相对湿度(RH)传感器,该传感器与通过溶胶-凝胶法制备的有机-硅杂化材料涂层相关联。基于有机硅的涂层与光纤具有很强的附着力,其膨胀受周围环境 RH 值(15.0-95.0%)变化的可逆影响,由于存在基于硅的无机成分,因此具有更高的灵敏度(22.2 pm/%RH)和耐用性。所开发的传感器在实际结构健康监测论文中进行了测试,其中在一年的时间内测量了两个具有不同孔隙率值的混凝土块内的 RH。结果表明,所提出的光学传感器在土木工程结构监测中的潜力。