Criteria for identification and diagnosis of anomalies in ceramic facades through quantitative infrared thermography

Abstract Thermography in the inspection of building facades allows the evaluation of anomalies in real time and without contact. However, it is necessary to develop criteria for the quantitative analysis of anomalies, to improve the mapping and analysis of severity. To determine and validate some of these criteria, this study evaluated the occurrence of ceramic detachment in a building through thermographic inspection. The north, south, east and west facade orientations in ceramic coating were inspected. The thermograms were evaluated by calculating the Delta-T and Delta-Tcor parameters. The influence of different heat flow conditions on the heating and cooling cycles was also evaluated in terms of the ability to detect and evaluate anomalies. The results indicate that the heat flux directly influences the detection capacity and that orientations with a higher incidence of radiation are easier to detect. The Delta-T and Delta-Tcor results, evaluated together, show convergence, which indicates that the Delta-Tcor is a satisfactory analysis criterion, applicable to other buildings with different heat flux conditions.

热成像（Thermography）技术应用于建筑外立面检测时，可实现无接触式实时异常评估。然而，目前仍需建立针对检测异常的定量分析标准，以优化异常的测绘流程与严重程度研判工作。为确定并验证部分此类标准，本研究通过热成像检测手段，针对某建筑的陶瓷饰面脱落情况展开了评估。研究覆盖了该建筑陶瓷饰面的北、南、东、西四个朝向的外立面，通过计算Delta-T与Delta-Tcor参数对热成像图开展分析，并从异常检测与评估能力的维度，评估了不同热流条件对升降温循环的影响。结果显示，热通量直接影响异常检测能力，且辐射入射量更高的建筑朝向更易完成异常检测。联合分析Delta-T与Delta-Tcor的结果可知二者具有良好一致性，这表明Delta-Tcor是一项令人满意的分析标准，可推广应用于存在不同热流条件的其他建筑。