Study on Standardization of Thermography for Separation Detection of Finish Material on External Wall of Building

在本研究中，定量地阐明了热像仪在建筑外墙饰面材料(如瓷砖和砂浆)分离检测中的适用性。本财年的结果总结如下：1)使用真实尺寸的试件进行实验讨论；通过使用带有人工缺陷的试件，阐明了这种检测方法在实验室水平上的局限性。实验参数如下：人工缺陷的面积、深度和厚度；季节、日照和测量时间；样品内外表面的风速和温差。特别是，为了提高实验的重现性，本实验采用了气溶胶温度的热控方法，再加上计算出的温度与太阳的热流密度相等。2)数据分析程序的开发；要将数据分析程序应用于建筑外墙饰面材料的分离检测，需要解决许多问题。3)有限元非稳态热传导分析；在上一财年的基础上，利用三维有限元方法对各种缺陷的假想外墙模型进行了非稳态热传导分析。参数包括缺陷的面积、深度和厚度；墙体内外表面的温差；以及加热和冷却的影响。将分析结果与实验结果进行了比较，阐明了理想状态下该方法的局限性和最佳条件。

In this study, applicability of thermography for separation detection of finish material, such as tile and mortar, on external wall of building are clarified quantitatively.The results in this fiscal year are summarized as follows :1) Experimental discussion using the real size specimen ; The limitation of this detection method on laboratory level is clarified by using specimens with artificial defects. The parameters in this experiment are as follows : area, depth and thickness of artificial defects ; season, insolation and measuring time ; wind velocity and thermal difference between inner and outer surface of specimen. Especially, in order to improve the reproducibility, this experiment was carried out using thermal control with sol-air temperature, that is added to calculated temperature equal to heat flux by insolation.2) Development of program for data analysis ; Many problems should be resolved in order to apply the program for data analysis to separation detection of finish material on external wall of building. In this fiscal year, a few considerations were programd in the data analysis as follows : geometrical correction ; thermal gradient correction ; stain and wind velocity correction.3) Unsteady heat conduction analysis by FEM ; Being continued from the last fiscal year, unsteady heat conduction analysis on imagined external wall model with various defects was carried out by using three dimensional finite element method. Parameters are area, depth and thickness of defect ; thermal difference between inner and outer surface of wall ; and effect of heating and cooling. The analytical results are compared with experimental results, and the limitation and the best condition for this method under ideal status is clarified.