建筑外墙外保温层表面裂缝的红外热成像检测

Infrared Thermal Imaging Detection of Surface Cracks in External Insulation Layer of Building Exterior Wall

建筑外墙外保温层作为一种建筑节能材料被广泛应用。为了有效检测外保温层出现的质量问题,提出一种基于外保温层表面裂缝三维传热模型的红外热成像检测方法。首先,借助红外热成像技术,搭建了建筑外墙外保温层表面裂缝检测实验平台,对外保温层的表面裂缝进行检测。之后,通过ANSYS软件建立了建筑外墙外保温层表面裂缝的红外热成像检测三维模型,验证了该模型的可行性,并模拟计算了裂缝尺寸和环境温度对检测效果的影响。结果表明:外保温层裂缝和非裂缝区域的温差主要受到实验环境温度、裂缝尺寸的影响。当环境温度一定时,裂缝宽度和厚度增大,温差随之增加。伴随着环境温度升高,温差也逐渐增大,当实验的环境温度在10℃以下时,温差变化较为平缓;当环境温度大于10℃,温差增长的速率随着温度的增加逐渐增大。

The external insulation layer of a building’s exterior wall is widely used for energy conservation in buildings.An infrared imaging detection method based on a three-dimensional heat transfer model for the surface cracks of the external insulation layer is proposed to effectively detect the quality problems of the external insulation layer.First,with the help of infrared thermal imaging technology,an experimental platform for surface crack detection of the external insulation layer of building exterior wall was built to detect the surface crack of the external insulation layer.Then,using ANSYS software,the three-dimensional infrared thermal imaging detection model for the surface cracks of the external insulation layer of the building exterior wall was established,the model’s feasibility was verified,and the effects of crack size and ambient temperature on the detection effect were simulated and calculated.The results show that the experimental ambient temperature and crack size have the greatest influence on the temperature difference between the crack and non-crack areas of the external insulation layer.When the ambient temperature remains constant,the crack width and thickness grow,as does the temperature difference.With an increase in ambient temperature,the temperature difference also increases gradually.When the ambient temperature is below 10℃,the temperature difference changes gently;when the ambient temperature exceeds 10℃,the rate of temperature difference growth increases gradually with increasing ambient temperature.