建筑外墙饰面层内部缺陷红外热像法检测试验研究

利用红外热像仪对建筑外墙饰面层（包括砂浆饰面层和饰面砖饰面层）内部缺陷进行检测试验,研究饰面层内部缺陷在外部热源辐射下的表面温度变化特征,得出饰面层表面温度随时间、空间的分布及变化规律,并分析内部缺陷的厚度、面积大小、埋置深度等因素对红外热成像效果的影响.试验结果表明,厚度越大、面积越大、深度越浅的内部缺陷越容易被检测出来;缺陷沿其宽度方向的表面温度关于其最大温度点呈近似对称关系.基于试验结果,采用统计分析的方法建立了缺陷面积大小预测模型.

Experimental Analysis of Infrared Thermography for Detecting Internal Defects of Decorative Layer on Exterior Wall

Internal defects of decorative layer on exterior wall, including mortar and ceramic tile decorative layers, were detected using thermal infrared imager. Variable characteristics of surface temperature for decorative layer heated by external heating source were studied. The distribution and variation law of surface temperature on decorative layer with time and space were obtained, and the influences of thickness, area and embedded depth of internal defect on image quality were analyzed. It is revealed that the thicker, bigger and shallower internal defect are more easily detected. The surface temperature of internal defect is maximum temperature point of approximate symmetry along with width direction. Based on the test results, the prediction model of dimensions for internal defect was established through statistical analysis technique, which can provide a reference for the related follow-up study and practical project application.