In this paper, we propose a novel detection technology to telemeter microcracks in concrete structures using an infrared thermal imager carried by an unmanned aerial vehicle and explore the thermal excitation method applicable to it. Moreover, this paper presents a selective thermal stimulation scheme design for microcracks in concrete, in which NaAlO₂ and NaHCO₃ solutions, whose temperatures are higher than the air temperature, were chosen as the stimulation sources, and relevant experimental studies were conducted. Simultaneously, the heat generation mechanism from the microcrack stimulation was studied. Thereafter, through the thermal stimulation test of prefabricated microcracks, the effects of different amounts of stimulation reagents and different stimulation times on the detection of microcracks were determined by controlling the variables and discussing each stimulation parameter. Furthermore, the optimum reagent dosage and best detection time window were determined. The actual microcracks on a concrete beam were used to verify the test scheme, and a good incentive effect was obtained.

在本文中，我们提出了一种新颖的检测技术，该技术可以使用无人机携带的红外热像仪遥测混凝土结构中的微裂纹，并探索适用于它的热激发方法。此外，本文提出了一种针对混凝土微裂纹的选择性热激励方案设计，其中NaAlO ₂和NaHCO ₃选择温度高于空气温度的溶液作为刺激源，并进行了相关的实验研究。同时，研究了微裂纹激发产生热量的机理。此后，通过预制微裂纹的热刺激试验，通过控制变量并讨论每个刺激参数，确定了不同数量的刺激剂和不同的刺激时间对微裂纹检测的影响。此外，确定了最佳试剂剂量和最佳检测时间窗口。用实际在混凝土梁上的微裂纹对试验方案进行了验证，取得了良好的激励效果。