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首页> 外文期刊>Building and Environment >Quasi-quantitative infrared thermographic detection of moisture variation in facades with adhered ceramic cladding using principal component analysis
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Quasi-quantitative infrared thermographic detection of moisture variation in facades with adhered ceramic cladding using principal component analysis

机译：使用主成分分析的定量红外热成像检测粘附陶瓷覆层的外墙水分变化

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摘要

High moisture content is a common problem of adhered glazed ceramic cladding. It leads to further problems such as biological growth, delamination and efflorescence. Increased moisture also affects users' indoor comfort and more energy is needed for heating due to higher thermal conductivity. Therefore, it is useful to detect it before visible signs occur and this is possible with infrared thermography. A quasi-quantitative approach based on time-dependent infrared thermographic inspection and thermogram analysis by quantitative methods was tested in an adhered ceramic facade where rising damp had already been identified. Simple image subtraction (SIS), nonnegative matrix factorization (NMF) and principal component analysis (PCA) were the quantitative methods tested for the analysis of thermograms. Hammer-tapping control and surface moisture measurements were the auxiliary techniques used to assess the results. Comparative assessments showed that the quasi-quantitative approach using PCA has great potential to detect changes in moisture and also to eliminate false indications caused by unavoidable reflection and shading. The results obtained by SIS and NMF on the other hand, had limited performance in showing areas with high moisture content. (C) 2015 Elsevier Ltd. All rights reserved.
机译：高水分含量是粘附釉面陶瓷覆层的常见问题。这会导致进一步的问题，例如生物生长，分层和风化。水分增加还会影响用户的室内舒适度，并且由于较高的导热性而需要更多的能量来加热。因此，在可见信号出现之前对其进行检测非常有用，而红外热成像技术则可以做到这一点。在一个已经确定了上升湿气的粘附陶瓷外墙上，测试了一种基于时间的红外热像仪检查和通过定量方法进行热谱图分析的准定量方法。简单图像减法（SIS），非负矩阵分解（NMF）和主成分分析（PCA）是测试热分析图的定量方法。锤击控制和表面湿度测量是用于评估结果的辅助技术。比较评估表明，使用PCA的准定量方法具有检测水分变化并消除不可避免的反射和阴影所导致的错误指示的巨大潜力。另一方面，SIS和NMF所获得的结果在显示高含水量区域方面的性能有限。 （C）2015 Elsevier Ltd.保留所有权利。

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