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传感元件与复合材料的一体化是智能结构研究的最终目标之一。设计一种具有自诊断功能的标准化、模块化光纤智能夹层系统,正是实现这种一体化最有潜力的技术途径。采用聚酰亚胺薄膜制作了基于光纤布拉格光栅(FBG)传感器的光纤光栅智能夹层,对智能夹层中光纤布拉格光栅传感器的应变、温度特性进行了标定试验,并建立了基于光纤布拉格光栅传感器光纤光栅智能夹层的应变、温度测量模型。试验表明,智能夹层内布拉格光栅波长偏移与应变、温度之间具有良好的线性关系。不过在温度测量时,必须考虑被埋入结构的热膨胀效应。利用光纤光栅智能夹层内光纤布拉格光栅传感器网络和先进信息处理技术,可以建立结构损伤主动、在线和实时监测系统。
The integration of sensor elements and composite materials is one of the ultimate goals of intelligent structure research. Designing a standardized, modular optical fiber smart mezzanine system with self-diagnostics is the most potential technical way to achieve this integration. The FBG smart interlayer based on fiber Bragg grating (FBG) sensor was fabricated by using polyimide film. The strain and temperature characteristics of fiber Bragg grating sensor in smart interlayer were calibrated. A fiber Bragg grating (FBG) fiber grating Intelligent sandwich strain and temperature measurement model. Experiments show that there is a good linear relationship between the wavelength shift of Bragg grating and the strain and temperature in the smart interlayer. However, in the temperature measurement, the thermal expansion effect of the structure to be embedded must be considered. Using FBG intelligent mezzanine fiber Bragg grating sensor network and advanced information processing technology, active, on-line and real-time monitoring system of structural damage can be established.