基于激光热激励红外热成像纤维增强聚合物复合材料加固混凝土结构界面损伤无损检测

Nondestructive debonding detection of fiber reinforced plastics strengthened concrete structure based on infrared thermal imaging with laser thermal excitation

红外热成像(IRT)检测技术常被用于纤维增强聚合物复合材料(FRP)加固混凝土板的剥离损伤无损检测。但传统热源激励IRT法受加热距离短、热灵敏度低、功耗大等因素影响较大。本文提出了基于光学激发线激光热源的IRT法对FRP加固混凝土的剥离检测方法,该方法通过控制线热束在FRP加固混凝土结构的表面形成移动扫描热激励,通过红外热像仪测量结构中的界面剥离引起的表面局部热分布异常。基于模拟和实验研究结果,证明该方法对FRP加固混凝土结构中界面剥离检测具有如下优势:利用激光扫描热成像技术检测FRP改造混凝土结构中剥离损伤的可行性;实现了FRP加固混凝土结构的远距离、高热灵敏度及低功耗的损伤检测。

The infrared thermal imaging(IRT) detection technology is often utilized for the debonding detection of concrete reinforced by fiber reinforced plastics(FRP) sheets. However, the traditional heat source excitation IRT method is affected by factors such as short heating distance, low thermal sensitivity and high power consumption. In order to solve these problems, the debonding detection of FRP-reinforced concrete structures based on optical excitation line laser heat source IRT method was proposed. The IRT method based on optical excitation line laser heat source was proposed to detect the debonding of FRP reinforced concrete. The surface local heat distribution anomalies caused by debonding in the structure could be measured by an infrared camera. Based on the numerical and experimental results, it is proved that the method has the advantages of debonding detection in FRP-reinforced concrete structure. This method has advantages: the feasibility of using laser scanning thermal imaging technology to detect the debonding damage in FRP reinforced concrete structure;FRP reinforcement long-distance, high thermal sensitivity and low power consumption damage detection of FRP reinforced concrete structures.